709
FNUS76 KOTX 042328
FWSOTX

Spot Forecast for Silver Fire...USFS
National Weather Service Spokane WA
428 PM PDT Fri Sep 4 2026

Forecast is based on forecast start time of 1800 PDT on September 04.
.DISCUSSION...

Weather remains much cooler and wetter through Sunday. Spotty
light showers for Friday night. Another round of showers will
arrive on Saturday and then again on Monday. Total precipitation
of between 0.05 to 0.20 inches through Saturday with and
additional quarter of an inch possible on Monday. Humidity
recoveries will range from fair to excellent. Gusty erratic winds
possible with thunderstorms.

If conditions become unrepresentative, contact the National Weather
Service.
***************************************************************
Forecasts for 20 foot wind speeds (valleys and ridge tops) are
10 minute averages reflecting RAWS wind.
***Ventilation Index is derived from transport wind
   multiplied by the mixing height divided by 100.
   Categories: low (< 200), moderate (200-500),
   high (500-800), and very high (> 800).
***************************************************************

.TONIGHT...

Sky/weather.........Mostly cloudy.
CWR.................0 percent.
Chance of lightning.5 percent.
Min temperature.....Ridgetop (at 7000 ft)........33.
                    Midslope (at 5500 ft)........37.
                    Valley Bottom (at 3600 ft)...42.
Max humidity........88-96 percent.
Wind (20 ft)........Ridge tops...West-Northwest winds 2 to 6 mph.
                    Valley bottom/Mid slopes...Downslope-
                    downvalley winds 1 to 3 mph after 1900 hours.
Mixing height.......2500 ft AGL falling to 800 ft AGL after
                    1900 hours.
Transport winds.....West around 5 mph shifting to the northeast
                    around 7 mph overnight.
Ventilation Index...Moderate (213).


.SATURDAY...

Sky/weather.........Mostly cloudy. Rain showers likely through the
                    day. Slight chance of thunderstorms in the
                    afternoon. Rain accumulation of between 0.05
                    and 0.15 inches expected.
CWR.................45 percent.
Chance of lightning.20 percent.
Max temperature.....Ridgetop (at 7000 ft)........45.
                    Midslope (at 5500 ft)........53.
                    Valley Bottom (at 3600 ft)...65.
Min humidity........Ridgetops (at 7000 ft).......81-85 percent.
Midslope (at 5500 ft)........69-73 percent.
                    Valley Bottom (at 3600 ft)...48-52 percent.
Wind (20 ft)........West ridge top winds 3 to 6 mph and South
                    Southwest 2 to 5 mph on mid-slopes. Gusty and
                    erratic winds expected near thunderstorms in
                    the afternoon.
Mixing height.......Increasing to 3500 ft AGL in the afternoon.
Transport winds.....Northeast around 5 mph early in the morning
                    shifting to the south-southwest around
                    9 mph in the afternoon.
Ventilation Index...Moderate (260) increasing to moderate (292) in
                    the afternoon.

.SATURDAY NIGHT...

Sky/weather.........Mostly cloudy. Slight chance of thunderstorms
                    in the evening. Chance of rain showers through
                    the night. Rain accumulation of between 0.05
                    and 0.15 inches expected.
CWR.................40 percent.
Chance of lightning.20 percent.
Min temperature.....Ridgetop (at 7000 ft)........33.
                    Midslope (at 5500 ft)........41.
                    Valley Bottom (at 3600 ft)...42.
Max humidity........80-85 percent.
Wind (20 ft)........Ridge tops...North-Northeast winds 4 to 8 mph.
                    Valley bottom/Mid slopes...Downslope-
                    downvalley winds 2 to 4 mph after 1900 hours.
Mixing height.......2000 ft AGL falling to 800 ft AGL after
                    1900 hours.
Transport winds.....Northeast 5 to 10 mph.
Ventilation Index...Low (127).

.SUNDAY...

Sky/weather.........Mostly cloudy. Chance of rain showers in the
                    afternoon. Rain accumulation of between 0.05
                    and 0.15 inches expected.
CWR.................30 percent.
Chance of lightning.10 percent.
Max temperature.....Ridgetop (at 7000 ft)........45.
                    Midslope (at 5500 ft)........53.
                    Valley Bottom (at 3600 ft)...65.
Min humidity........Ridgetops (at 7000 ft).......84-89 percent.
Midslope (at 5500 ft)........83-87 percent.
                    Valley Bottom (at 3600 ft)...78-82 percent.
Wind (20 ft)........North-Northeast around 4 to 8 mph with
                    afternoon gusts near 20 mph.
Mixing height.......Increasing to 6000 ft AGL in the
                    afternoon.
Transport winds.....Northeast-east 10 to 20 mph.
Ventilation Index...Moderate (314).

$$
Forecaster...JCLEV
Requested by...Bruce Giersdorf
Type of request...WILDFIRE
.TAG 2620738.7/OTX
.DELDT 09/04/26
.FormatterVersion 2.0.0
.EMAIL bgiersdorf@yahoo.com