FNUS76 KPDT 181346
FWSPDT

Spot Forecast for West Silvies RX...BLM
National Weather Service Pendleton OR
646 AM PDT Mon May 18 2026

Forecast is based on ignition time of 0900 PDT on May 18. 
***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.

Light and variable winds this morning will become westerly by mid 
afternoon and increase to the 10 to 15 mph by 3 pm. By 5 PM, winds
will increase to 15 to 20 out of the northwest through sunset. 


.DISCUSSION...

.REST OF TODAY...

Sky/weather.........Mostly sunny (25-35 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....61-64. 
Min humidity........15-20 percent. 
Wind (20 ft)........Light winds becoming north 5 to 8 mph in the 
                    late morning and afternoon. 
Ridgetop wind.......Light winds becoming north 7 to 9 mph in the 
                    late morning and afternoon.  
Mixing height.......10000 ft AGL. 
Transport winds.....North 15 to 17 mph. 
Ventilation Index...Moderate (250) increasing to very high (1050) 
                    in the afternoon. 

TIME (PDT)      9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0   
Temp............42  51  54  56  59  59  60  61  59  59  57  50  
RH..............54  43  35  29  24  22  21  20  21  23  25  34  
20 FT wind dir..N   N   N   N   N   N   N   N   N   N   N   N   
20 FT wind spd..4   5   7   7   8   8   8   8   8   8   7   6   
20 FT wind gust.7   8   10  10  11  12  12  13  12  12  11  8   

.TONIGHT...

Sky/weather.........Mostly clear (15-25 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Min temperature.....Around 30. 
Max humidity........71-76 percent. 
Wind (20 ft)........North winds 5 to 8 mph early in the evening 
                    becoming light. 
Ridgetop wind.......North winds 6 to 9 mph early in the evening 
                    becoming light. 
Mixing height.......500 ft AGL in the evening then 500 ft AGL early 
                    in the morning. 
Transport winds.....North 6 to 15 mph. 
Ventilation Index...Moderate (450) decreasing to low (30) 
                    overnight. 

.TUESDAY...

Sky/weather.........Sunny (15-25 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....Around 70. 
Min humidity........15-20 percent. 
Wind (20 ft)........Light winds becoming west 5 to 8 mph late in 
                    the morning, then shifting to the northwest 5 
                    to 7 mph late in the afternoon. 
Ridgetop wind.......Light winds becoming west 7 to 810 mph late in 
                    the morning, then shifting to the northwest 7 
                    to 12 mph late in the afternoon.  
Mixing height.......9200 ft AGL. 
Transport winds.....Northwest 6 to 13 mph. 
Ventilation Index...Low (130) increasing to very high (910) in the 
                    afternoon. 

$$
Forecaster...Russell
Requested by...Tyler Swartzlender
Type of request...PRESCRIBED
.TAG 2613500.3/PDT
.DELDT 05/18/26
.FormatterVersion 2.0.0
.EMAIL tswartzlender@blm.gov