507 
FNUS76 KPDT 030101
FWSPDT

Spot Forecast for STONE...USFS
National Weather Service Pendleton OR
601 PM PDT Tue Sep 2 2025

Forecast is based on forecast start time of 0600 PDT on September 03. 
***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.

...HEAT ADVISORY IN EFFECT UNTIL 8 PM PDT THURSDAY...

.DISCUSSION...Hot and dry with diurnally/terrain-driven winds through Thursday.
Afternoon RH will be low and overnight recovery is expected to be poor to moderate.
Shower and thunder chances are low (10% or less).

.WEDNESDAY...

Sky/weather.........Partly cloudy (35-55 percent). Smoke and haze. 
CWR.................0 percent. 
Chance of lightning.5 percent. 
Max temperature.....94-97. 
Min humidity........13-18 percent. 
Wind (20 ft)........Terrain-driven winds 2-5 mph early morning, becoming
                    northwest 4-8 mph with gusts of 10-15 mph late morning
                    and afternoon. 
Ridgetop wind.......Terrain-driven winds 2-5 mph early morning, becoming
                    northwest 4-8 mph with gusts of 10-15 mph late morning
                    and afternoon. 
Mixing height.......Increasing to 8700-9200 ft AGL by early afternoon. 
Transport winds.....Southeast 3-6 mph early in the morning becoming variable
                    4-6 mph late morning and afternoon. 
Ventilation Index...Poor (40) increasing to fair (220) in the 
                    afternoon. 

TIME (PDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   10  
Temp............62  63  66  72  76  82  86  90  93  94  95  95  
RH..............43  43  43  42  39  31  27  22  20  16  16  15  
20 FT wind dir..S   S   SW  SW  SW  NW  NW  NW  NW  NW  NW  NW   
20 FT wind spd..4   4   4   4   4   4   5   5   6   6   6   6   
20 FT wind gust.5   5   5   5   5   6   8   8   12  12  12  12  

.WEDNESDAY NIGHT...

Sky/weather.........Mostly cloudy (50-60 percent) then becoming 
                    partly cloudy (35-45 percent). Smoke and haze. 
CWR.................0 percent. 
Chance of lightning.5 percent. 
Min temperature.....63-66. 
Max humidity........45-50 percent. 
Wind (20 ft)........Northwest winds 4-8 mph early in the evening 
                    becoming south to southwest 3-6 mph overnight. 
Ridgetop wind.......Northwest winds 4-8 mph early in the evening 
                    becoming south to southwest 3-6 mph overnight. 
Mixing height.......Decreasing to 500-900 ft AGL overnight. 
Transport winds.....Variable 3-6 mph. 
Ventilation Index...Poor (100) decreasing to poor (30) overnight. 

.THURSDAY...

Sky/weather.........Mostly sunny (25-35 percent). Smoke and haze.
CWR.................0 percent. 
Chance of lightning.10 percent. 
Max temperature.....93-96. 
Min humidity........13-18 percent. 
Wind (20 ft)........Terrain-driven winds 2-5 mph early morning, becoming
                    upslope 4-7 mph late morning. 
Ridgetop wind.......Terrain-driven winds 2-5 mph early morning, becoming
                    upslope 4-7 mph late morning. 
Mixing height.......Increasing to 10500-11000 ft AGL by mid-afternoon. 
Transport winds.....Variable 4-6 mph. 
Ventilation Index...Poor (30) increasing to fair (220) in the 
                    afternoon. 

$$
Forecaster...Plunkett
Requested by...LISA DAVIS
Type of request...WILDFIRE
.TAG 2521161.0/PDT
.DELDT 09/02/25
.FormatterVersion 2.0.0
.EMAIL STACY.LAURITSEN@ODF.OREGON.GOV,ORJDCC@FIRENET.GOV