626
FNUS76 KPDT 121815
FWSPDT

Spot Forecast for Umatilla Tumbleweed RX...USFWS
National Weather Service Pendleton OR
1015 AM PST Thu Feb 12 2026

Forecast is based on ignition time of 1000 PST on February 12.
***Thunderstorms imply gusty and erratic winds***
***Winds are 20 foot 10-minute averages***
***CWR-Chance of wetting rain 0.10 or greater***
***Ventilation Index is derived from the
   transport wind multiplied by the mixing
   height in 100`s of feet. Index categories
   are a generalized indicator only.***

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

.DISCUSSION...

Light and variable surface winds are expected through the balance
of the day. Mixing heights will max out at about 1500 ft AGL by 1-3 pm
and crash to the surface between 5 and 6 pm.


.REST OF TODAY...

Sky/weather.........Mostly cloudy (80-90 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....Around 50.
Min humidity........67-72 percent.
Wind (20 ft)........Light winds becoming south 5 to 7 mph late in
                    the afternoon.
Ridgetop wind.......Light winds becoming south 5 to 7 mph late in
                    the afternoon.
Mixing height.......Reaching as high as 1200-1500 ft AGL before falling to the surface at 5 pm.
Transport winds.....Light winds becoming southwest 5 to 6 mph in
                    the afternoon.
Ventilation Index...Poor (30-40).

TIME (PST)      10 AM  NOON   2 PM   4 PM   6 PM   8 PM
Chc of ltng (%).0      0      0      0      0      0
Temp............39     43     47     48     45     41
RH..............89     80     71     72     80     90
20 ft wind......SW 4   SW 4   W 4    S 5    S 5    S 5
20 ft wind gust.              5

.TONIGHT...

Sky/weather.........Cloudy (85-95 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....32-35.
Max humidity........95-100 percent.
Wind (20 ft)........South winds 5 to 7 mph in the evening and
                    overnight becoming light.
Ridgetop wind.......South winds 5 to 7 mph in the evening and
                    overnight becoming light.
Mixing height.......500 ft AGL in the late afternoon falling to surface at 5 pm.
Transport winds.....Southwest 5 to 7 mph.
Ventilation Index...Poor (30).

.FRIDAY...

Sky/weather.........Mostly cloudy (75-85 percent). Slight chance of
                    rain late in the afternoon.
CWR.................1 percent.
Chance of lightning.0 percent.
Max temperature.....49-52.
Min humidity........65-70 percent.
Wind (20 ft)........Light winds becoming southwest 5 to 8 mph.
Ridgetop wind.......Light winds becoming southwest 5 to 8 mph.
Mixing height.......Rising as high as 2000 to 2300 ft AGL.
Transport winds.....Southwest 6 to 12 mph.
Ventilation Index...Poor (30-100) increasing to poor (100) in the
                    afternoon.

$$
Forecaster...Russell
Requested by...Thomas Boggs
Type of request...PRESCRIBED
.TAG 2602599.0/PDT
.DELDT 02/12/26
.FormatterVersion 2.0.0
.EMAIL thomas_boggs@fws.gov