Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Eureka, CA
Issued by NWS Eureka, CA
441
FNUS56 KEKA 182136
FWFEKA
FIRE WEATHER PLANNING FORECAST FOR NORTHWEST CALIFORNIA
NATIONAL WEATHER SERVICE Eureka CA
236 PM PDT Tue Aug 18 2026
.DISCUSSION...Generally near normal temperatures are expected
through mid week with high temperatures in the low 90s for
interior valleys and minimum RH as low as 20 percent. Winds are
generally gentle and terrain driven. While low elevation humidity
recoveries remain good, thermal belts will peak Tuesday night
into Wednesday with poor RH recovery on mid and upper slopes.
Marine influence will generally increase late in the week,
increasing humidity and some afternoon mixing through Friday.
There is a very slight (5%) chance of isolated dry thunderstorms
early Friday morning and through the day focused in Trinity and
northern Humboldt Counties.
CAZ401-191330-
Coastal Del Norte-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy then becoming mostly cloudy.
Patchy fog in the late evening and
overnight.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...52-55
Ridges/upr slopes....51-54
* Max Humidity.......
Valleys/lwr slopes...91-100 percent
Ridges/upr slopes....89-99 percent
* 20-Foot Winds...
Valleys/lwr slopes...Light winds 1 to 3 mph.
Ridges/upr slopes....Variable 1 to 3 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Mostly cloudy then becoming partly cloudy.
Patchy fog in the morning.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...63-70
Ridges/upr slopes....64-70
* Min Humidity.......
Valleys/lwr slopes...70-82 percent
Ridges/upr slopes....71-81 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
west 5 mph in the afternoon.
Ridges/upr slopes....Variable 1 to 3 mph...becoming west 5 mph
in the afternoon.
* Mixing Height..........1100 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Partly cloudy then becoming mostly cloudy.
Patchy fog late in the evening. Areas of
fog after midnight.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...51-54
Ridges/upr slopes....49-53
* Max Humidity.......
Valleys/lwr slopes...94-100 percent
Ridges/upr slopes....93-100 percent
* 20-Foot Winds...
Valleys/lwr slopes...Light winds 1 to 3 mph.
Ridges/upr slopes....Variable 1 to 3 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Mostly cloudy then becoming partly cloudy.
Areas of fog early in the morning, then
patchy fog late in the morning.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...61-66
Ridges/upr slopes....60-66
* Min Humidity.......
Valleys/lwr slopes...78-93 percent
Ridges/upr slopes....78-88 percent
* 20-Foot Winds...
Valleys/lwr slopes...Light winds 1 to 3 mph...becoming west 5
mph in the afternoon.
Ridges/upr slopes....Variable 1 to 3 mph...becoming west 5 mph
in the afternoon.
* Mixing Height..........1500 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ402-191330-
Interior Del Norte Including the Smith River Valley-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Mostly clear then becoming mostly cloudy.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...53-61
Ridges/upr slopes....56-64
* Max Humidity.......
Valleys/lwr slopes...70-85 percent
Ridges/upr slopes....54-69 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 mph...shifting to the
northeast after midnight.
Ridges/upr slopes....North winds 5 to 7 mph...shifting to the
northeast after midnight.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...75-83
Ridges/upr slopes....73-81
* Min Humidity.......
Valleys/lwr slopes...63-73 percent
Ridges/upr slopes....56-66 percent
* 20-Foot Winds...
Valleys/lwr slopes...North winds 5 mph...shifting to the west
in the afternoon.
Ridges/upr slopes....Northeast winds 5 to 6 mph...shifting to
the west in the afternoon.
* Mixing Height..........3400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...50-58
Ridges/upr slopes....55-63
* Max Humidity.......
Valleys/lwr slopes...75-90 percent
Ridges/upr slopes....65-80 percent
* 20-Foot Winds...
Valleys/lwr slopes...Downslope/downvalley 1 to 3 mph.
Ridges/upr slopes....West winds 5 mph in the evening...becoming
downslope/downvalley 2 to 4 mph.
* Mixing Height..........300 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny then becoming partly cloudy then
becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...70-78
Ridges/upr slopes....68-76
* Min Humidity.......
Valleys/lwr slopes...69-84 percent
Ridges/upr slopes....71-81 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 1 to 3 mph...becoming
west 5 to 6 mph in the afternoon.
Ridges/upr slopes....Variable 2 to 4 mph...becoming west 5 to 6
mph in the afternoon.
* Mixing Height..........3200 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ403-191330-
Northeastern Interior Humboldt and Southwestern Siskiyou
Including Orleans-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...58-64
Ridges/upr slopes....61-64
* Max Humidity.......
Valleys/lwr slopes...53-63 percent
Ridges/upr slopes....36-46 percent
* 20-Foot Winds...
Valleys/lwr slopes...Southwest winds 5 to 9 mph...shifting to
the northeast 5 mph after midnight.
Ridges/upr slopes....Northwest winds 5 to 8 mph...shifting to
the northeast 5 to 6 mph after midnight.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...92-100
Ridges/upr slopes....79-87
* Min Humidity.......
Valleys/lwr slopes...19-27 percent
Ridges/upr slopes....24-32 percent
* 20-Foot Winds...
Valleys/lwr slopes...East winds 5 to 7 mph...shifting to the
southwest 5 to 10 mph in the afternoon.
Ridges/upr slopes....Northeast winds 5 to 7 mph...shifting to
the west 5 to 9 mph in the afternoon.
* Mixing Height..........7900 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...57-64
Ridges/upr slopes....61-64
* Max Humidity.......
Valleys/lwr slopes...59-74 percent
Ridges/upr slopes....47-57 percent
* 20-Foot Winds...
Valleys/lwr slopes...Southwest winds 5 to 8 mph in the
evening...becoming downslope/downvalley 2
to 5 mph.
Ridges/upr slopes....West winds 5 to 8 mph in the
evening...becoming downslope/downvalley 2
to 5 mph.
* Mixing Height..........300 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...88-96
Ridges/upr slopes....76-84
* Min Humidity.......
Valleys/lwr slopes...24-32 percent
Ridges/upr slopes....31-39 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....Variable 2 to 5 mph...becoming southwest 5
to 8 mph in the afternoon.
* Mixing Height..........6500 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ404-191330-
Northern Coastal Humboldt-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Mostly cloudy. Patchy fog in the late
evening and overnight.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...52-55
Ridges/upr slopes....around 51
* Max Humidity.......
Valleys/lwr slopes...92-100 percent
Ridges/upr slopes....95 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 7 mph in the
evening...becoming light winds 2 to 4 mph.
Ridges/upr slopes....North winds 5 to 6 mph in the
evening...becoming light winds 2 to 4 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Mostly cloudy then becoming partly cloudy.
Patchy fog in the morning.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...62-68
Ridges/upr slopes....around 60
* Min Humidity.......
Valleys/lwr slopes...74-89 percent
Ridges/upr slopes....83 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........1300 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Mostly cloudy. Patchy fog in the late
evening and overnight.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...52-55
Ridges/upr slopes....around 52
* Max Humidity.......
Valleys/lwr slopes...93-100 percent
Ridges/upr slopes....95 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 6 mph in the
evening...becoming light winds 2 to 4 mph.
Ridges/upr slopes....North winds 5 to 6 mph in the
evening...becoming light winds 2 to 4 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Mostly cloudy. Patchy fog in the morning.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...60-66
Ridges/upr slopes....around 58
* Min Humidity.......
Valleys/lwr slopes...79-94 percent
Ridges/upr slopes....91 percent
* 20-Foot Winds...
Valleys/lwr slopes...Light winds 2 to 4 mph...becoming
northwest 5 to 7 mph in the afternoon.
Ridges/upr slopes....Variable 1 to 3 mph...becoming northwest 5
mph in the afternoon.
* Mixing Height..........1500 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ405-191330-
Northwestern Interior Humboldt Including the Bald Hills-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...53-61
Ridges/upr slopes....55-63
* Max Humidity.......
Valleys/lwr slopes...75-90 percent
Ridges/upr slopes....62-77 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 mph in the evening...becoming
downslope/downvalley 1 to 3 mph.
Ridges/upr slopes....West winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
* Mixing Height..........300 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny. Patchy
fog early in the morning.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...73-81
Ridges/upr slopes....70-78
* Min Humidity.......
Valleys/lwr slopes...65-75 percent
Ridges/upr slopes....60-70 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 1 to 3 mph...becoming
west 5 mph in the afternoon.
Ridges/upr slopes....Variable 1 to 3 mph...becoming west 5 mph
in the afternoon.
* Mixing Height..........1600 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Mostly clear. Patchy fog early in the
morning.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...51-57
Ridges/upr slopes....53-61
* Max Humidity.......
Valleys/lwr slopes...80-95 percent
Ridges/upr slopes....68-83 percent
* 20-Foot Winds...
Valleys/lwr slopes...Downslope/downvalley 1 to 3 mph.
Ridges/upr slopes....Variable 1 to 3 mph.
* Mixing Height..........300 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny then becoming partly cloudy then
becoming sunny. Patchy fog in the morning.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...68-76
Ridges/upr slopes....65-73
* Min Humidity.......
Valleys/lwr slopes...69-84 percent
Ridges/upr slopes....68-78 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 1 to 3 mph...becoming
west 5 mph in the afternoon.
Ridges/upr slopes....Variable 1 to 3 mph...becoming west 5 mph
in the afternoon.
* Mixing Height..........1900 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ406-191330-
Eastern Interior Humboldt Including Willow Creek and Hoopa-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy. Patchy smoke in the
evening.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...around 60
Ridges/upr slopes....62-66
* Max Humidity.......
Valleys/lwr slopes...56-71 percent
Ridges/upr slopes....40-50 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 7 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 7 mph...shifting to
the northeast 5 to 6 mph after midnight.
* Mixing Height..........300 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...90-98
Ridges/upr slopes....76-84
* Min Humidity.......
Valleys/lwr slopes...27-35 percent
Ridges/upr slopes....31-39 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
northwest 5 to 7 mph in the afternoon.
Ridges/upr slopes....East winds 5 to 6 mph...shifting to the
west 5 to 7 mph in the afternoon.
* Mixing Height..........4700 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...56-59
Ridges/upr slopes....59-63
* Max Humidity.......
Valleys/lwr slopes...64-79 percent
Ridges/upr slopes....47-57 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....West winds 5 to 6 mph...shifting to the
southeast 5 mph after midnight.
* Mixing Height..........300 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...85-93
Ridges/upr slopes....73-81
* Min Humidity.......
Valleys/lwr slopes...34-44 percent
Ridges/upr slopes....36-46 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
west 5 to 6 mph in the afternoon.
Ridges/upr slopes....Southeast winds 5 mph...shifting to the
west 5 to 6 mph in the afternoon.
* Mixing Height..........5100 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ407-191330-
Southwestern Humboldt Including the King Range and the Eel River
Valley-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...53-57
Ridges/upr slopes....53-61
* Max Humidity.......
Valleys/lwr slopes...76-91 percent
Ridges/upr slopes....67-82 percent
* 20-Foot Winds...
Valleys/lwr slopes...North winds 5 to 9 mph in the
evening...becoming downslope/downvalley 2
to 5 mph.
Ridges/upr slopes....North winds 5 to 11 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...79-87
Ridges/upr slopes....68-76
* Min Humidity.......
Valleys/lwr slopes...46-56 percent
Ridges/upr slopes....65-75 percent
* 20-Foot Winds...
Valleys/lwr slopes...North winds 5 to 7 mph.
Ridges/upr slopes....North winds 5 to 9 mph.
* Mixing Height..........2400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...52-56
Ridges/upr slopes....53-59
* Max Humidity.......
Valleys/lwr slopes...80-95 percent
Ridges/upr slopes....73-88 percent
* 20-Foot Winds...
Valleys/lwr slopes...North winds 5 to 8 mph.
Ridges/upr slopes....North winds 5 to 8 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny then becoming partly cloudy then
becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...75-83
Ridges/upr slopes....64-72
* Min Humidity.......
Valleys/lwr slopes...53-63 percent
Ridges/upr slopes....72-87 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
northwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....North winds 5 to 7 mph.
* Mixing Height..........2400 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ408-191330-
Southeastern Interior Humboldt Including Kneeland and Alderpoint-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...53-60
Ridges/upr slopes....55-63
* Max Humidity.......
Valleys/lwr slopes...73-88 percent
Ridges/upr slopes....58-73 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph in the
evening...becoming downslope/downvalley 2
to 5 mph.
Ridges/upr slopes....Northwest winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...78-86
Ridges/upr slopes....71-79
* Min Humidity.......
Valleys/lwr slopes...56-66 percent
Ridges/upr slopes....67-77 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 7 mph.
Ridges/upr slopes....Variable 2 to 4 mph...becoming west 5 to 6
mph in the afternoon.
* Mixing Height..........3500 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Clear then becoming mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...52-57
Ridges/upr slopes....53-61
* Max Humidity.......
Valleys/lwr slopes...82-97 percent
Ridges/upr slopes....64-79 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 7 mph.
Ridges/upr slopes....Northwest winds 5 mph in the
evening...becoming downslope/downvalley 1
to 3 mph.
* Mixing Height..........300 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny then becoming partly cloudy then
becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...74-82
Ridges/upr slopes....67-75
* Min Humidity.......
Valleys/lwr slopes...62-72 percent
Ridges/upr slopes....75-85 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
west 5 to 6 mph in the afternoon.
Ridges/upr slopes....Variable 2 to 4 mph...becoming west 5 to 6
mph in the afternoon.
* Mixing Height..........4000 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ409-191330-
Northwestern Trinity Including Salyer and Big Bar-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Mostly clear. Patchy smoke in the evening.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...58-63
Ridges/upr slopes....61-66
* Max Humidity.......
Valleys/lwr slopes...52-62 percent
Ridges/upr slopes....37-44 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 9 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph...shifting to
the northeast 5 to 7 mph after midnight.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...92-100
Ridges/upr slopes....79-87
* Min Humidity.......
Valleys/lwr slopes...18-26 percent
Ridges/upr slopes....19-26 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
west 5 to 6 mph in the afternoon.
Ridges/upr slopes....Southeast winds 5 to 6 mph...shifting to
the southwest 5 to 9 mph in the afternoon.
* Mixing Height..........8900 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...57-62
Ridges/upr slopes....60-65
* Max Humidity.......
Valleys/lwr slopes...55-70 percent
Ridges/upr slopes....39-49 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....West winds 5 to 7 mph...shifting to the
east 5 to 6 mph after midnight.
* Mixing Height..........300 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...90-98
Ridges/upr slopes....77-85
* Min Humidity.......
Valleys/lwr slopes...22-30 percent
Ridges/upr slopes....20-28 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....East winds 5 to 7 mph...shifting to the
south 5 to 9 mph in the afternoon.
* Mixing Height..........9900 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ410-191330-
Northeastern Trinity Including Trinity Lake-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy. Patchy smoke late in the
evening.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...59-66
Ridges/upr slopes....57-64
* Max Humidity.......
Valleys/lwr slopes...46-56 percent
Ridges/upr slopes....36-46 percent
* 20-Foot Winds...
Valleys/lwr slopes...Southwest winds 5 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....North winds 5 to 7 mph.
* Mixing Height..........500 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...90-98
Ridges/upr slopes....77-85
* Min Humidity.......
Valleys/lwr slopes...15-21 percent
Ridges/upr slopes....19-27 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
south 5 to 6 mph in the afternoon.
Ridges/upr slopes....East winds 5 to 6 mph...shifting to the
south 5 to 7 mph in the afternoon.
* Mixing Height..........8700 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...59-65
Ridges/upr slopes....56-64
* Max Humidity.......
Valleys/lwr slopes...49-59 percent
Ridges/upr slopes....38-48 percent
* 20-Foot Winds...
Valleys/lwr slopes...South winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Southwest winds 5 to 7 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny then becoming partly cloudy.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...87-95
Ridges/upr slopes....74-82
* Min Humidity.......
Valleys/lwr slopes...16-22 percent
Ridges/upr slopes....21-29 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southeast 5 to 7 mph in the afternoon.
Ridges/upr slopes....East winds 5 to 6 mph...shifting to the
south 5 to 9 mph in the afternoon.
* Mixing Height..........8900 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ411-191330-
Eastern Trinity Including Weaverville and Hayfork-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy. Patchy smoke late in the
evening.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...57-64
Ridges/upr slopes....61-66
* Max Humidity.......
Valleys/lwr slopes...48-58 percent
Ridges/upr slopes....38-48 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 8 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph...shifting to
the north 5 mph after midnight.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...93-100
Ridges/upr slopes....82-90
* Min Humidity.......
Valleys/lwr slopes...16-22 percent
Ridges/upr slopes....18-26 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....Variable 2 to 4 mph...becoming southwest 5
to 6 mph in the afternoon.
* Mixing Height..........9700 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...55-63
Ridges/upr slopes....60-65
* Max Humidity.......
Valleys/lwr slopes...51-61 percent
Ridges/upr slopes....42-52 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 mph in the evening...becoming
downslope/downvalley 1 to 3 mph.
Ridges/upr slopes....West winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...91-97
Ridges/upr slopes....79-87
* Min Humidity.......
Valleys/lwr slopes...15-20 percent
Ridges/upr slopes....18-26 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 1 to 3 mph...becoming
southeast 5 to 6 mph in the afternoon.
Ridges/upr slopes....Variable 2 to 4 mph...becoming southeast 5
to 6 mph in the afternoon.
* Mixing Height..........10000 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ412-191330-
Southern Trinity Including Ruth Lake and the Yolla Bollys-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...57-63
Ridges/upr slopes....56-64
* Max Humidity.......
Valleys/lwr slopes...56-71 percent
Ridges/upr slopes....51-61 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 7 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 7 mph...shifting to
the northeast 5 mph after midnight.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...88-96
Ridges/upr slopes....80-88
* Min Humidity.......
Valleys/lwr slopes...24-32 percent
Ridges/upr slopes....23-31 percent
* 20-Foot Winds...
Valleys/lwr slopes...North winds 5 mph...shifting to the west 5
to 7 mph in the afternoon.
Ridges/upr slopes....Southeast winds 5 to 6 mph...shifting to
the southwest 5 to 7 mph in the afternoon.
* Mixing Height..........7400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...56-61
Ridges/upr slopes....55-63
* Max Humidity.......
Valleys/lwr slopes...61-76 percent
Ridges/upr slopes....53-68 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....West winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
* Mixing Height..........300 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...85-93
Ridges/upr slopes....77-85
* Min Humidity.......
Valleys/lwr slopes...27-35 percent
Ridges/upr slopes....24-32 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....Variable 2 to 4 mph...becoming southwest 5
to 7 mph in the afternoon.
* Mixing Height..........8700 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ413-191330-
Coastal Mendocino-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy then becoming mostly cloudy.
Patchy fog in the late evening and early
morning. Areas of fog late in the night.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...51-54
Ridges/upr slopes....51-57
* Max Humidity.......
Valleys/lwr slopes...85-100 percent
Ridges/upr slopes....80-95 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny. Areas
of fog early in the morning. Patchy fog
late in the morning.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...66-74
Ridges/upr slopes....68-76
* Min Humidity.......
Valleys/lwr slopes...68-83 percent
Ridges/upr slopes....61-71 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 7 mph.
Ridges/upr slopes....West winds 5 to 7 mph.
* Mixing Height..........1100 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Partly cloudy. Patchy fog in the late
evening and early morning. Areas of fog
early in the morning.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...50-53
Ridges/upr slopes....49-55
* Max Humidity.......
Valleys/lwr slopes...90-100 percent
Ridges/upr slopes....83-98 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 7 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Partly cloudy then becoming mostly cloudy
then becoming partly cloudy. Patchy fog in
the morning.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...62-70
Ridges/upr slopes....64-72
* Min Humidity.......
Valleys/lwr slopes...75-90 percent
Ridges/upr slopes....63-78 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
northwest 5 to 7 mph in the afternoon.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........1300 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ414-191330-
Northern Interior Mendocino Including Leggett and Willits-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...53-61
Ridges/upr slopes....56-64
* Max Humidity.......
Valleys/lwr slopes...64-79 percent
Ridges/upr slopes....59-74 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...87-95
Ridges/upr slopes....80-88
* Min Humidity.......
Valleys/lwr slopes...32-40 percent
Ridges/upr slopes....37-47 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....Variable 2 to 4 mph...becoming west 5 to 6
mph in the afternoon.
* Mixing Height..........4700 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Clear then becoming mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...51-59
Ridges/upr slopes....53-61
* Max Humidity.......
Valleys/lwr slopes...69-84 percent
Ridges/upr slopes....65-80 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 mph in the evening...becoming
downslope/downvalley 1 to 3 mph.
Ridges/upr slopes....Northwest winds 5 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
* Mixing Height..........300 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny then becoming partly cloudy then
becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...82-90
Ridges/upr slopes....76-84
* Min Humidity.......
Valleys/lwr slopes...36-46 percent
Ridges/upr slopes....47-57 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
west 5 to 6 mph in the afternoon.
Ridges/upr slopes....Variable 2 to 4 mph...becoming west 5 to 6
mph in the afternoon.
* Mixing Height..........4100 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ415-191330-
Northeastern Interior Mendocino Including Covelo-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...56-64
Ridges/upr slopes....61-68
* Max Humidity.......
Valleys/lwr slopes...54-69 percent
Ridges/upr slopes....42-52 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 7 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 7 mph...shifting to
the northeast 5 mph after midnight.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...90-98
Ridges/upr slopes....80-88
* Min Humidity.......
Valleys/lwr slopes...22-27 percent
Ridges/upr slopes....22-30 percent
* 20-Foot Winds...
Valleys/lwr slopes...Southeast winds 5 mph...shifting to the
southwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....Southeast winds 5 to 6 mph...shifting to
the southwest 5 to 7 mph in the afternoon.
* Mixing Height..........7200 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...57-65
Ridges/upr slopes....60-67
* Max Humidity.......
Valleys/lwr slopes...55-70 percent
Ridges/upr slopes....41-51 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....West winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
* Mixing Height..........300 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny then becoming partly cloudy.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...88-96
Ridges/upr slopes....77-85
* Min Humidity.......
Valleys/lwr slopes...21-26 percent
Ridges/upr slopes....22-30 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....Variable 2 to 4 mph...becoming southwest 5
to 7 mph in the afternoon.
* Mixing Height..........7700 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ416-191330-
Southeastern Interior Mendocino Including Ukiah and Potter Valley-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...57-65
Ridges/upr slopes....64-72
* Max Humidity.......
Valleys/lwr slopes...59-74 percent
Ridges/upr slopes....48-58 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 8 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....West winds 5 to 8 mph in the
evening...becoming downslope/downvalley 2
to 5 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...89-97
Ridges/upr slopes....82-90
* Min Humidity.......
Valleys/lwr slopes...26-34 percent
Ridges/upr slopes....30-38 percent
* 20-Foot Winds...
Valleys/lwr slopes...Southwest winds 5 to 8 mph.
Ridges/upr slopes....Southwest winds 5 to 8 mph.
* Mixing Height..........5400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...54-62
Ridges/upr slopes....61-69
* Max Humidity.......
Valleys/lwr slopes...62-77 percent
Ridges/upr slopes....52-62 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........300 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny then becoming partly cloudy.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...84-92
Ridges/upr slopes....79-86
* Min Humidity.......
Valleys/lwr slopes...31-39 percent
Ridges/upr slopes....32-42 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
west 5 to 6 mph in the afternoon.
Ridges/upr slopes....Northwest winds 5 mph...shifting to the
west 5 to 7 mph in the afternoon.
* Mixing Height..........5100 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ417-191330-
Southwestern Interior Mendocino Including Boonville-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...54-62
Ridges/upr slopes....56-64
* Max Humidity.......
Valleys/lwr slopes...72-87 percent
Ridges/upr slopes....63-78 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 7 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...79-87
Ridges/upr slopes....77-85
* Min Humidity.......
Valleys/lwr slopes...46-56 percent
Ridges/upr slopes....47-57 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
west 5 to 6 mph in the afternoon.
Ridges/upr slopes....Variable 2 to 4 mph...becoming west 5 to 6
mph in the afternoon.
* Mixing Height..........2500 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Mostly clear. Patchy fog early in the
morning.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...52-59
Ridges/upr slopes....54-62
* Max Humidity.......
Valleys/lwr slopes...78-93 percent
Ridges/upr slopes....67-82 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 mph in the
evening...becoming downslope/downvalley 1
to 3 mph.
Ridges/upr slopes....Northwest winds 5 to 7 mph.
* Mixing Height..........300 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny then becoming partly cloudy. Patchy
fog early in the morning.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...75-83
Ridges/upr slopes....72-80
* Min Humidity.......
Valleys/lwr slopes...54-64 percent
Ridges/upr slopes....55-65 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
west 5 to 6 mph in the afternoon.
Ridges/upr slopes....Northwest winds 5 to 7 mph.
* Mixing Height..........2300 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ418-191330-
Northern Lake Including Gravelly Valley-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy then becoming mostly cloudy.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...59-67
Ridges/upr slopes....64-72
* Max Humidity.......
Valleys/lwr slopes...50-60 percent
Ridges/upr slopes....38-48 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 7 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....West winds 5 to 7 mph...shifting to the
northeast 5 to 6 mph after midnight.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...96-101
Ridges/upr slopes....82-90
* Min Humidity.......
Valleys/lwr slopes...18-23 percent
Ridges/upr slopes....22-30 percent
* 20-Foot Winds...
Valleys/lwr slopes...Southeast winds 5 to 6 mph...shifting to
the southwest 5 to 7 mph in the afternoon.
Ridges/upr slopes....East winds 5 to 6 mph...shifting to the
southwest 5 to 8 mph in the afternoon.
* Mixing Height..........6600 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...58-66
Ridges/upr slopes....63-71
* Max Humidity.......
Valleys/lwr slopes...47-57 percent
Ridges/upr slopes....34-44 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 7 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........300 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny then becoming partly cloudy.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...92-98
Ridges/upr slopes....79-87
* Min Humidity.......
Valleys/lwr slopes...17-25 percent
Ridges/upr slopes....19-27 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....North winds 5 mph...shifting to the
southwest 5 to 7 mph in the afternoon.
* Mixing Height..........6600 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ419-191330-
Eastern Lake Including Clearlake and Middletown-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy then becoming mostly cloudy.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...59-67
Ridges/upr slopes....65-73
* Max Humidity.......
Valleys/lwr slopes...54-69 percent
Ridges/upr slopes....44-54 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 8 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....West winds 5 to 8 mph...shifting to the
northwest 5 mph after midnight.
* Mixing Height..........500 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...95-99
Ridges/upr slopes....88-93
* Min Humidity.......
Valleys/lwr slopes...19-27 percent
Ridges/upr slopes....20-28 percent
* 20-Foot Winds...
Valleys/lwr slopes...East winds 5 mph...shifting to the south 5
to 7 mph in the afternoon.
Ridges/upr slopes....Northeast winds 5 mph...shifting to the
south 5 to 8 mph in the afternoon.
* Mixing Height..........6700 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...57-65
Ridges/upr slopes....62-70
* Max Humidity.......
Valleys/lwr slopes...58-73 percent
Ridges/upr slopes....46-56 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....West winds 5 to 8 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny then becoming partly cloudy.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...93-97
Ridges/upr slopes....87-92
* Min Humidity.......
Valleys/lwr slopes...20-28 percent
Ridges/upr slopes....20-27 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
south 5 to 6 mph in the afternoon.
Ridges/upr slopes....Northwest winds 5 mph...shifting to the
south 5 to 6 mph in the afternoon.
* Mixing Height..........6500 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ420-191330-
Southern Lake Including Cobb and Konocti-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy then becoming mostly cloudy.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...61-69
Ridges/upr slopes....68-74
* Max Humidity.......
Valleys/lwr slopes...51-61 percent
Ridges/upr slopes....44-51 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 8 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....West winds 5 to 8 mph in the
evening...becoming downslope/downvalley 2
to 5 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...92-97
Ridges/upr slopes....83-90
* Min Humidity.......
Valleys/lwr slopes...25-33 percent
Ridges/upr slopes....28-36 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southwest 5 to 7 mph in the afternoon.
Ridges/upr slopes....East winds 5 mph...shifting to the
southwest 5 to 7 mph in the afternoon.
* Mixing Height..........5900 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...58-66
Ridges/upr slopes....65-71
* Max Humidity.......
Valleys/lwr slopes...52-62 percent
Ridges/upr slopes....44-52 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....West winds 5 to 7 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny then becoming partly cloudy.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...89-95
Ridges/upr slopes....81-88
* Min Humidity.......
Valleys/lwr slopes...25-33 percent
Ridges/upr slopes....28-36 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....Northwest winds 5 mph...shifting to the
southwest 5 to 6 mph in the afternoon.
* Mixing Height..........6100 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ421-191330-
Western Lake Including Lakeport-
236 PM PDT Tue Aug 18 2026
.TONIGHT...
* Sky/Weather............Partly cloudy.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...59-66
Ridges/upr slopes....64-72
* Max Humidity.......
Valleys/lwr slopes...57-72 percent
Ridges/upr slopes....43-53 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 7 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...90-97
Ridges/upr slopes....86-91
* Min Humidity.......
Valleys/lwr slopes...26-34 percent
Ridges/upr slopes....25-31 percent
* 20-Foot Winds...
Valleys/lwr slopes...Southeast winds 5 mph...shifting to the
southwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....East winds 5 mph...shifting to the
southwest 5 to 8 mph in the afternoon.
* Mixing Height..........6600 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY NIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...57-64
Ridges/upr slopes....61-69
* Max Humidity.......
Valleys/lwr slopes...58-73 percent
Ridges/upr slopes....44-54 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........400 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny then becoming partly cloudy.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...87-94
Ridges/upr slopes....81-86
* Min Humidity.......
Valleys/lwr slopes...26-34 percent
Ridges/upr slopes....26-32 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....Northwest winds 5 mph...shifting to the
west 5 to 6 mph in the afternoon.
* Mixing Height..........6300 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
.EXTENDED FORECAST FOR DAYS 3 THROUGH 5...
...Northwest California Coast...
.FRIDAY...Mostly cloudy. Patchy fog in the evening. Areas of fog.
Lows in the lower to mid 50s. Highs 59 to 65. Winds generally
less than 5 mph.
.SATURDAY...Mostly cloudy. Areas of fog after midnight. Patchy
fog in the morning. Lows 49 to 54. Highs 61 to 67. North winds
5 mph.
.SUNDAY...Partly cloudy. Patchy fog. Lows in the lower to mid
50s. Highs 64 to 70. North winds 5 mph.
...Northwest California Interior...
.FRIDAY...Mostly cloudy. Lows 56 to 64. Highs 78 to 91. West
winds 5 mph.
.SATURDAY...Mostly clear. Lows 51 to 59. Highs 79 to 90.
Northwest winds 5 mph.
.SUNDAY...Mostly clear. Lows 53 to 61. Highs 83 to 93. Northwest
winds 5 mph.
.6 to 10 DAY OUTLOOK...Monday August 24 THROUGH Friday August 28, 2026...
FOR NW CALIF...ABOVE NORMAL TEMPERATURES AND NEAR NORMAL PRECIPITATION.
$$
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