078
FNUS76 KPDT 171356
FWSPDT

Spot Forecast for West Silvies RX...BLM
National Weather Service Pendleton OR
656 AM PDT Sun May 17 2026

Forecast is based on ignition time of 0900 PDT on May 17.
***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...Breezy north winds will persist throughout today,
becoming light late overnight. Winds pick up again early tomorrow
morning, but are expected to remain 11 mph or less. Min RHs today
will dip into the upper 20s to low 30s, then decrease further into
the upper teens tomorrow. Overnight recovery will be excellent.
Dry conditions and light winds will continue through the week.

.REST OF TODAY...

Sky/weather.........Mostly sunny (25-35 percent).
CWR.................0 percent.
Chance of lightning.1 percent.
Max temperature.....51-54.
Min humidity........29-34 percent.
Wind (20 ft)........North winds 10 to 17 mph with gusts to around 23
                    mph.
Ridgetop wind.......North winds 12 to 19 mph with gusts to around 26
mph.
Mixing height.......6400 ft AGL.
Transport winds.....North 23 to 29 mph.
Ventilation Index...Moderate (410) 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............35  39  43  45  47  49  50  50  51  49  48  45
RH..............73  54  49  46  39  33  29  31  31  32  34  47
20 FT wind dir..N   N   N   N   N   N   N   N   N   N   N   N
20 FT wind spd..12  12  13  14  14  15  15  17  17  17  18  15
20 FT wind gust.18  18  18  19  20  21  22  22  23  26  26  23

.TONIGHT...

Sky/weather.........Mostly clear (10-20 percent) then becoming
                    mostly cloudy (60-70 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....25-28.
Max humidity........87-92 percent.
Wind (20 ft)........North winds 10 to 18 mph with gusts to around 26
                    mph decreasing to 5 to 10 mph around 11PM, then
becoming light downslope/drainage winds after
3AM.
Ridgetop wind.......North winds 12 to 19 mph with gusts to around 27
mph decreasing to 5 to 10 mph around 11PM.
Mixing height.......500 ft AGL.
Transport winds.....North around 29 mph decreasing to 10 to 18 mph
                    early in the evening.
Ventilation Index...High (660) decreasing to low (60) overnight.

.MONDAY...

Sky/weather.........Partly sunny (50-60 percent).
CWR.................0 percent.
Chance of lightning.1 percent.
Max temperature.....61-64.
Min humidity........18-23 percent.
Wind (20 ft)........Light downslope/drainage winds becoming north
5 to 10 mph after 8AM.
Ridgetop wind.......North winds 5 to 11 mph.
Mixing height.......10200 ft AGL.
Transport winds.....North 10 to 14 mph.
Ventilation Index...Low (190) increasing to very high (1010) in the
                    afternoon.

$$
Forecaster...Lawhorn
Requested by...Tyler Swartzlender
Type of request...PRESCRIBED
.TAG 2613500.2/PDT
.DELDT 05/17/26
.FormatterVersion 2.0.0
.EMAIL tswartzlender@blm.gov