831
FNUS76 KPDT 211648
FWSPDT

Spot Forecast for Rock Pit...WA DNR
National Weather Service Pendleton OR
848 AM PST Fri Nov 21 2025

Forecast is based on ignition time of 0900 PST on November 21.
***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...Excellent (95-100%) overnight humidity recoveries
this morning as high pressure slides over the fire area today and
keeps mixing heights rather low. This will lead to warmer (+2)
and drier (-8%) conditions today as breezy winds are expected late
morning through mid-afternoon. Winds will shift out of the
southwest after gusts peak, and will continue to decrease tonight
into Saturday morning. Light, diurnally and terrain driven winds
Saturday with similar temperatures and more moist conditions than
today.

.REST OF TODAY...

Sky/weather.........Mostly sunny (45-55 percent).
CWR.................0 percent.
Max temperature.....48-53.
Min humidity........54-59 percent.
Wind (20 ft)........West winds 4 to 8 mph with gusts up to 12 mph,
                    peaking between 1100 and 1500. Winds shift out
                    of the southwest after 1600 and decrease
                    slightly.
Ridgetop wind.......West winds 5 to 10 mph with gusts up to 14
                    mph, peaking between 1100 and 1500. Winds shift
                    out of the southwest after 1600 and decrease
                    slightly.
Mixing height.......2300 ft AGL.
Transport winds.....West 7 to 10 mph.
Ventilation Index...Poor (90-180).

TIME (PST)      9 AM   11 AM  1 PM   3 PM   5 PM   7 PM
Temp............35     44     48     50     45     40
RH..............86     70     58     57     65     76
20 ft wind......W 4    W 5    W 6    W 5    SW 4   SW 5
20 ft wind gust.6      9      11     8      6      5

.TONIGHT...

Sky/weather.........Partly cloudy (40-50 percent) then becoming
                    mostly cloudy (55-65 percent) after 1900.
CWR.................0 percent.
Min temperature.....28-33.
Max humidity........92-97 percent.
Wind (20 ft)........Southwest winds 4 to 8 mph becoming 2 to 6
                    mph after 1500.
Ridgetop wind.......Southwest winds 5 to 10 mph becoming 3 to 7
                    mph after 1500.
Mixing height.......1400 ft AGL.
Transport winds.....West 6 to 7 mph.
Ventilation Index...Poor (70-90) decreasing to poor (60-70)
                    overnight.

.SATURDAY...

Sky/weather.........Partly sunny (50-60 percent).
CWR.................0 percent.
Max temperature.....49-54.
Min humidity........68-73 percent.
Wind (20 ft)........Light southwest winds 2 to 5 mph becoming
                    northeast around 0600 then shifting back
                    out of the southwest around noon.
Ridgetop wind.......Light southwest winds 3 to 6 mph becoming
                    northeast around 0600 then shifting back
                    out of the southwest around noon.
Mixing height.......2100 ft AGL.
Transport winds.....West 5 to 6 mph in the morning and early
                    afternoon becoming light.
Ventilation Index...Poor (60-70) decreasing to poor (30-70) in the
                    afternoon.

$$
Forecaster...Callihan
Requested by...Carolyn Kelly
Type of request...PRESCRIBED
.TAG 2526507.0/PDT
.DELDT 11/21/25
.FormatterVersion 2.0.0
.EMAIL carolyn.kelly@dnr.wa.gov