911
FNUS76 KPDT 300435
FWSPDT

Spot Forecast for FOUNTAIN SPRINGS FIRE...WALLA WALLA COUNTY FIRE DISTRICT 4
National Weather Service Pendleton OR
935 PM PDT Tue Sep 29 2026

Forecast is based on forecast start time of 2200 PDT on September 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...Dry conditions will prevail over the fire through
the forecast period. Winds will be from the south at 8-14 mph
with overnight recoveries above 80%. Wednesday will see continued
south winds 5-8 mph before shifting to the west after 1600. Daytime
humidity will be in the low to mid 40%. Overnight Wednesday will
see light and variable winds with recoveries above 70%.

.REST OF TONIGHT...

Sky/weather.........Partly cloudy (40-50 percent) then becoming
                    mostly cloudy (45-55 percent) then becoming
                    partly cloudy (40-50 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....52-55.
Max humidity........80-85 percent.
Wind (20 ft)........South winds 8 to 14 mph.
Mixing height.......500 ft AGL.
Transport winds.....South 9 to 16 mph.
Ventilation Index...Low (60) overnight.

TIME (PDT)      10P 11P MID 1AM 2AM 3AM 4AM 5AM 6AM 7AM 8AM 9AM
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............62  61  59  59  58  57  56  55  53  52  54  56
RH..............64  66  72  72  76  80  80  83  88  86  84  77
20 FT wind dir..S   S   S   S   S   S   S   S   S   S   S   S
20 FT wind spd..14  14  13  12  11  10  8   8   8   8   8   8
20 FT wind gust.17  16  14  13  12  11  11  10  10          10

.WEDNESDAY...

Sky/weather.........Partly sunny (50-60 percent) then becoming
                    sunny (10-20 percent).
CWR.................0 percent.
Chance of lightning.1 percent.
Max temperature.....69-72.
Min humidity........42-47 percent.
Wind (20 ft)........Southwest winds 5 to 8 mph shifting to the west
                    5 to 7 mph after 1600.
Mixing height.......4300 ft AGL.
Transport winds.....Southwest 7 to 9 mph shifting to the west
                    around 5 mph late in the afternoon.
Ventilation Index...Low (70) increasing to moderate (260) in the
                    afternoon.

.WEDNESDAY NIGHT...

Sky/weather.........Partly cloudy (20-30 percent) then becoming
                    mostly cloudy (60-70 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....Around 50.
Max humidity........76-81 percent.
Wind (20 ft)........Light winds.
Mixing height.......2000 ft AGL early in the evening.
Transport winds.....West around 5 mph early in the evening becoming
                    light, then becoming east around 5 mph late in
                    the evening becoming light becoming east around
                    5 mph early in the morning.
Ventilation Index...Low (30).

$$
Forecaster...Bennese
Requested by...BRANDON MCKINNEY
Type of request...WILDFIRE
.TAG 2622809.0/PDT
.DELDT 09/29/26
.FormatterVersion 2.0.0
.EMAIL spotweather@wwfire4.com