FNUS76 KPDT 200336
FWSPDT

Spot Forecast for TRAINING HOUSE BURN...WALLA WALLA COUNTY FIRE DISTRICT 4
National Weather Service Pendleton OR
836 PM PDT Tue May 19 2026

Forecast is based on ignition time of 0500 PDT on May 20. 
***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 generally be less than 10 mph Wednesday
and Wednesday night, with dry conditions at the surface. Winds
will shift from south to west/northwest in the afternoon tomorrow
then shift back to the southeast/south overnight. RHs will be in
the mid 20s tomorrow afternoon, with good overnight recoveries.
Low level inversions will begin to lift around 8AM and breaking
before noon. 

.REST OF TONIGHT...

Sky/weather.........Mostly cloudy (50-60 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Min temperature.....49-52. 
Max humidity........72-77 percent. 
Wind (20 ft)........South winds 5 to 8 mph. 
Mixing height.......400 ft AGL.
Transport winds.....South around 7 mph. 
Ventilation Index...Low (100). 

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............49  51  54  56  61  63  65  67  69  71  74  74  
RH..............76  75  69  62  59  55  52  48  43  40  36  34  
20 FT wind dir..S   S   S   SW  SW  W   W   W   W   W   NW  NW  
20 FT wind spd..5   5   6   6   6   6   7   7   6   6   6   6   
20 FT wind gust.            10  8               7   7           

.WEDNESDAY...

Sky/weather.........Mostly sunny (25-35 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....76-79. 
Min humidity........27-32 percent. 
Wind (20 ft)........South winds 5 to 8 mph shifting to the 
                    southwest around 8AM, then shifting to the
					west around 10AM, then shifting to the
					northwest after 3PM. 
Mixing height.......6600 ft AGL in the late morning. 
Transport winds.....Southwest 7 to 8 mph shifting to the north 
                    around 5 mph late in the afternoon. 
Ventilation Index...Low (100) increasing to moderate (280) in the 
                    afternoon. 

.WEDNESDAY NIGHT...

Sky/weather.........Mostly clear (20-30 percent) then becoming 
                    mostly cloudy (50-60 percent) then becoming 
                    partly cloudy (20-30 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Min temperature.....Around 50. 
Max humidity........67-72 percent. 
Wind (20 ft)........Northwest winds 5 to 8 mph shifting to the 
                    southeast 5 to 8 mph after 8PM, then 
                    shifting to the south 4 to 7 mph around 4AM.
Mixing height.......4400 ft AGL early in the evening then 500 ft 
                    AGL early in the morning. 
Transport winds.....North around 5 mph shifting to the southeast 5 
                    to 6 mph early in the evening. 
Ventilation Index...Low (40) decreasing to low (30) overnight. 

$$
Forecaster...Lawhorn
Requested by...BRANDON MCKINNEY
Type of request...PRESCRIBED
.TAG 2614085.0/PDT
.DELDT 05/19/26
.FormatterVersion 2.0.0
.EMAIL trainingsofficers@wwfire4.com,bmckinney@wwfire4.com