343
FNUS76 KPDT 271243
FWSPDT

Spot Forecast for NW HQ...USFWS
National Weather Service Pendleton OR
543 AM PDT Mon Apr 27 2026

Forecast is based on ignition time of 0800 PDT on April 29.
***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 transport wind
   multiplied by the mixing height in 100`s of ft.
   Categories are a generalized indicator only:
   low (< 200), moderate (200-500), high (500-700),
   and very high (> 700).                           ***

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

.DISCUSSION...Winds will be from the southeast Wednesday afternoon,
then shifting to the north in the overnight period. Winds will shift
back to the southeast Thursday, but will then continue to shift to
the south in the afternoon. RHs will be in the lower 30s Wednesday,
then lower into the mid 20s Thursday. Conditions will remain dry
with a gradual warming trend into the weekend.

.WEDNESDAY...

Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....70-73.
Min humidity........30-35 percent.
Wind (20 ft)........Light winds becoming southeast 5 to 10 mph
around 11AM.
Ridgetop wind.......Light north winds shifting to the east
5 to 10 mph around 11AM.
Mixing height.......6400 ft AGL.
Transport winds.....East 5 to 10 mph.
Ventilation Index...Low (50) increasing to moderate (410) in the
                    afternoon.

TIME (PDT)      8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............42  47  53  59  63  66  68  70  70  69  68  65
RH..............71  63  55  48  43  39  36  34  34  35  39  44
20 FT wind dir..N   N   N   SE  SE  SE  SE  SE  SE  SE  SE  SE
20 FT wind spd..3   3   3   6   6   6   7   7   7   8   8   8
20 FT wind gust.6   6   6   10  10  10  11  11  11  11  11  11

.WEDNESDAY NIGHT...

Sky/weather.........Mostly clear (5-15 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....43-46.
Max humidity........64-69 percent.
Wind (20 ft)........Southeast winds 5 to 10 mph shifting to the north
3 to 6 mph around 11PM.
Ridgetop wind.......East winds 5 to 10 mph shifting to the north
3 to 6 mph around 11PM.
Mixing height.......1100 ft AGL.
Transport winds.....East around 10 mph early in the evening
                    becoming light, then becoming north 5 to 6 mph
                    late in the evening.
Ventilation Index...Moderate (220) decreasing to low (40)
                    overnight.

.THURSDAY...

Sky/weather.........Mostly sunny (25-35 percent).
CWR.................0 percent.
Chance of lightning.1 percent.
Max temperature.....74-77.
Min humidity........25-30 percent.
Wind (20 ft)........North winds 3 to 6 mph shifting to the
                    southeast 5 to 8 mph around 11AM, then
                    shifting to the south 5 to 10 mph after
1PM.
Ridgetop wind.......North winds 3 to 6 mph shifting to the
southeast 5 to 10 mph around 11AM, then
shifting to the south after1PM.
Mixing height.......6100 ft AGL.
Transport winds.....North around 6 mph early in the morning
                    becoming light, then becoming southeast around
                    6 mph late in the morning shifting to the
                    southwest around 9 mph.
Ventilation Index...Low (50) increasing to moderate (280) in the
                    afternoon.

$$
Forecaster...Lawhorn
Requested by...Thomas Boggs
Type of request...PRESCRIBED
.TAG 2611776.0/PDT
.DELDT 04/27/26
.FormatterVersion 2.0.0
.EMAIL Thomas_boggs@fws.gov