FNUS76 KPDT 191543
FWSPDT

Spot Forecast for Elk16Q...USFS
National Weather Service Pendleton OR
843 AM PDT Tue May 19 2026

Forecast is based on ignition time of 0800 PDT on May 19. 
***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...Warming and mostly dry conditions are forecast today
and Wednesday. Excellent RH recovery is forecast overnight. Looking
ahead to the weekend and early next week, there is low confidence in
forecast details. As of this morning's forecast cycle, by Monday and 
Tuesday, there is a 40-60 percent chance of a closed low and showers
over the region, a 20-30 percent chance of a fast-moving trough and
dry cold frontal passage, and a low chance of a flat ridge or more zonal
pattern overhead.

.REST OF TODAY...

Sky/weather.........Mostly sunny (5-25 percent) becoming partly cloudy 
                    (35-65 percent) by afternoon. 
CWR.................0 percent. 
Chance of lightning.1 percent. 
Max temperature.....59-62. 
Min humidity........25-30 percent. 
Wind (20 ft)........Light winds becoming west to northwest 5-9 mph
                    in the late morning and afternoon. Gusts up to
                    15 mph in the afternoon.
Ridgetop wind.......Light winds becoming west to northwest 6-10 mph
                    in the late morning and afternoon. Gusts up to
                    15 mph in the afternoon.
Mixing height.......Increasing to 9000-9500 ft AGL by early afternoon. 
Transport winds.....West to northwest 8-12 mph. 
Ventilation Index...Low (160) increasing to very high (710) in the 
                    afternoon. 

TIME (PDT)      8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 
Chc of ltng (%).0   0   0   0   0   1   1   1   1   1   1   1   
Temp............38  50  53  55  57  58  59  60  59  60  58  56  
RH..............65  41  35  31  31  29  28  27  26  26  29  33  
20 FT wind dir..W   W   W   W   W   W   W   W   NW  NW  NW  NW  
20 FT wind spd..4   5   6   7   7   7   8   8   8   8   8   8   
20 FT wind gust.5   6   7   8   8   10  10  10  11  12  11  11  

.TONIGHT...flat ridge of

Sky/weather.........Partly cloudy (30-40 percent). 
CWR.................0 percent. 
Chance of lightning.2 percent in the evening, 0 percent overnight. 
Min temperature.....35-38. 
Max humidity........80-85 percent. 
Wind (20 ft)........North winds 4-8 mph in the evening, becoming 
                    drainage winds 1-5 mph overnight. 
Ridgetop wind.......North winds 6-10 mph in the evening, north to northwest
                    winds 4-8 mph overnight. 
Mixing height.......Decreasing to 300-600 ft AGL overnight. 
Transport winds.....Northwest 8-12 mph early evening, shifting to the north 
                    6-8 mph late in the evening. 
Ventilation Index...Moderate (390) decreasing to low (30) 
                    overnight. 

.WEDNESDAY...

Sky/weather.........Partly cloudy (25-65 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....64-67. 
Min humidity........26-31 percent. 
Wind (20 ft)........Northwest winds 4-7 mph increasing to 6-10 mph with 
                    gusts of 12-17 mph in the afternoon. 
Ridgetop wind.......Northwest winds 4-8 mph increasing to 8-12 mph with 
                    gusts of 14-19 mph in the afternoon.  
Mixing height.......Increasing to 7500-8000 ft AGL by afternoon. 
Transport winds.....Northwest 5-8 mph, becoming north to northwest 8-12
                    mph late afternoon. 
Ventilation Index...Low (120) increasing to high (520) in the 
                    afternoon. 

.FORECAST DAYS 3 THROUGH 7...
.THURSDAY...
Mostly clear. Lows in the upper 30s. Highs in the upper 60s.
North winds around 5 mph. 
.FRIDAY...
Mostly clear. Lows in the lower 40s. Highs around 70. Light
winds. 
.SATURDAY...
Mostly clear. Lows in the mid 40s. Highs in the mid 70s. Light
winds. 
.SUNDAY...
Mostly clear. Lows in the mid 40s. Highs in the mid 70s. 
.MEMORIAL DAY...
Partly cloudy. Lows in the mid 40s. Highs in the upper 60s. 

$$
Forecaster...Plunkett
Requested by...David Maynard
Type of request...PRESCRIBED
.TAG 2614027.0/PDT
.DELDT 05/19/26
.FormatterVersion 2.0.0
.EMAIL david.maynard@usda.gov