964
FNUS76 KPDT 200408
FWSPDT

Spot Forecast for Rocky 79...USFS
National Weather Service Pendleton OR
908 PM PDT Sun May 19 2024

Forecast is based on ignition time of 0600 PDT on May 20.
***Thunderstorms imply gusty and erratic winds***
***Winds are 20 foot 10-minute averages***
***CWR-Chance of wetting rain 0.10 or greater***

If you have questions or concerns with this forecast, please
contact our office at (541) 276-8134.

.DISCUSSION...Dry conditions are forecast Monday followed by
a weather system late Tuesday morning through Tuesday afternoon.
The system on Tuesday will usher in stronger westerly winds and
light rain (75-80% chance of measurable rain) with low chances
of wetting rain (15-20% chance).

.MONDAY...

Sky/weather.........Sunny (5-15 percent).
CWR.................0 percent.
LAL.................1.
Max temperature.....65-68.
Min humidity........28-33 percent.
Wind (20 ft)........Light and variable in the morning, shifting to
                    the north 5-10 mph with gusts 15-20
                    mph late in the afternoon.
Ridgetop wind.......Light and variable in the morning, shifting to
                    the north 5-10 mph with gusts 15-20
                    mph late in the afternoon.
Mixing height.......Increasing to 7000-7500 ft AGL by afternoon.
Transport winds.....Northwest 5-12 mph, strongest after noon.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.

TIME (PDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM
Temp............39     44     54     59     63     63
RH..............76     64     49     41     34     33
20 ft wind......W 3    SE 2   SE 4   E 5    N 8    N 8
20 ft wind gust.                     10     18     18

.MONDAY NIGHT...

Sky/weather.........Mostly clear (15-25 percent).
CWR.................2 percent.
LAL.................1.
Min temperature.....41-44.
Max humidity........68-73 percent.
Wind (20 ft)........West-northwest winds 4-9 mph with gusts to
                    15 mph in the evening, becoming west-northwest
                    3-6 mph overnight.
Ridgetop wind.......West-northwest winds 4-9 mph with gusts to
                    15 mph in the evening, becoming west-northwest
                    3-6 mph overnight.
Mixing height.......Decreasing to 500-700 ft AGL overnight.
Transport winds.....West-northwest 6-10 mph.
Haines Index........2 to 3 or very low potential for large plume
                    dominated fire growth.

.TUESDAY...

Sky/weather.........Mostly cloudy (60-70 percent). Chance of rain
                    showers by late morning. Rain showers likely
                    in the afternoon.
CWR.................2 percent increasing to 15-20 percent late morning
                    through afternoon.
LAL.................1.
Max temperature.....58-61.
Min humidity........54-59 percent.
Wind (20 ft)........West winds 5-8 mph in the morning, increasing
                    to 8-12 mph with gusts of 20-30 mph in the
                    afternoon.
Ridgetop wind.......West winds 5-8 mph in the morning, increasing
                    to 8-12 mph with gusts of 20-30 mph in the
                    afternoon.
Mixing height.......Increasing to 3000-3500 ft AGL late morning
                    and afternoon.
Transport winds.....West 6-10 mph increasing to 15-20 mph
                    in the afternoon.
Haines Index........2 or very low potential for large plume
                    dominated fire growth.

$$
Forecaster...Plunkett
Requested by...Andrew Bellairs
Type of request...PRESCRIBED
.TAG 2414681.0/PDT
.DELDT 05/20/24
.FormatterVersion 2.0.0
.EMAIL Richard.lancaster@usda.gov,andrew.s.bellairs@usda.gov