674
FNUS76 KPDT 210953
FWSPDT

Spot Forecast for SPRING CREEK FIRE...WALLA WALLA COUNTY FIRE DISTRICT 4
National Weather Service Pendleton OR
253 AM PDT Tue Jul 21 2026

Forecast is based on forecast start time of 0500 PDT on July 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 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.

...HEAT ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO 9 PM PDT
THURSDAY...

.DISCUSSION...Upper level high pressure continue to build over the
region. Winds remain diurnally driven, with southeast winds developing
overnight and northwest winds in the afternoon. Smoke from area
wildfires may bring reduced visibility as well as limit
afternoon heating over the fire area. Overnight recovery will
become poor later tonight, with afternoon RHs in the mid teens.

.REST OF TONIGHT...

Sky/weather.........Partly cloudy (25-35 percent). Patchy smoke.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....63-66.
Max humidity........41-46 percent.
Wind (20 ft)........Southeast winds 4 to 7 mph.
Mixing height.......500 ft AGL.
Transport winds.....Southeast around 5 mph.
Ventilation Index...Low (30).

TIME (PDT)      5AM 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............66  64  68  72  78  82  85  89  90  93  96  96
RH..............46  48  46  39  32  31  28  25  25  22  22  21
20 FT wind dir..SE  SE  S   SW  W   W   W   NW  NW  NW  NW  NW
20 FT wind spd..5   5   4   4   5   5   6   6   6   7   6   6
20 FT wind gust.                                        7   7

.TODAY...

Sky/weather.........Mostly sunny (25-35 percent). Patchy smoke.
CWR.................0 percent.
Chance of lightning.1 percent.
Max temperature.....99-102.
Min humidity........16-21 percent.
Wind (20 ft)........Southeast winds 4 to 7 mph shifting to the west
after 8AM, then shifting to the northwest
around 12PM.
Mixing height.......5500 ft AGL.
Transport winds.....Southeast around 5 mph early in the morning
                    becoming light, then becoming northwest 5 to 6
                    mph late in the morning.
Ventilation Index...Low (30) increasing to moderate (210) in the
                    afternoon.

.TONIGHT...

Sky/weather.........Partly cloudy (30-40 percent). Patchy smoke.
CWR.................0 percent.
Chance of lightning.1 percent.
Min temperature.....Around 70.
Max humidity........37-42 percent.
Wind (20 ft)........Northwest winds 4 to 8 mph shifting to the
                    southeast around 9PM.
Mixing height.......500 ft AGL.
Transport winds.....Northwest around 5 mph shifting to the
                    southeast 5 to 7 mph early in the evening.
Ventilation Index...Low (30).

.WEDNESDAY...

Sky/weather.........Mostly sunny (35-45 percent). Patchy smoke.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....101-104.
Min humidity........15-20 percent.
Wind (20 ft)........Southeast winds 5 to 8 mph shifting to the west
                    after 9AM.
Mixing height.......8900 ft AGL.
Transport winds.....Southwest around 7 mph shifting to the west 6
                    to 7 mph late in the morning.
Ventilation Index...Low (70) increasing to moderate (420) in the
                    afternoon.

$$
Forecaster...Lawhorn
Requested by...BRANDON MCKINNEY
Type of request...WILDFIRE
.TAG 2617669.5/PDT
.DELDT 07/21/26
.FormatterVersion 2.0.0
.EMAIL spotweather@wwfire4.com,jgolden@wwfire4.com