939 
FNUS76 KPDT 091121
FWSPDT

Spot Forecast for Lower Monumental...North County Fire
National Weather Service Pendleton OR
421 AM PDT Tue Sep 9 2025

Forecast is based on forecast start time of 0800 PDT on September 09. 
***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.

.DISCUSSION....A slowly approaching weather system will bring 
a chance for afternoon and early evening showers and thunderstorms
today and Wednesday. Any storms that develop could produce gusty 
winds, small hail, and brief downpours. Although locally wetting 
rains with these storms are possible, overall CWRs remain 
generally low. Moisture from this system however will foster
excellent RH recoveries overnight. 

.TODAY...

Sky/weather.........Mostly sunny (40-50 percent). Chance of rain 
                    showers and slight chance of thunderstorms. 
                    Haze late in the morning. 
CWR.................0 percent. 
Chance of lightning.22 percent. 
Max temperature.....83-86. 
Min humidity........35-40 percent. 
Wind (20 ft)........South winds 5 to 8 mph shifting to the west 
                    late in the morning. Gusty and erratic winds 
                    expected near thunderstorms early in the 
                    morning. 
Ridgetop wind.......Northeast 6 to 8 mph. 
Mixing height.......5600 ft AGL. 
Transport winds.....Southwest 7 to 8 mph shifting to the north 8 to 
                    9 mph late in the morning. 
Ventilation Index...Poor (50) increasing to fair (360) in the 
                    afternoon. 

TIME (PDT)      8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 
Chc of ltng (%).20  20  20  20  20  20  20  20  20  10  10  10  
Temp............62  65  71  73  76  79  81  81  83  81  81  78  
RH..............73  64  60  55  51  46  43  40  39  39  41  48  
20 FT wind dir..S   S   S   W   W   W   W   W   W   W   W   W   
20 FT wind spd..8   8   8   8   8   8   8   8   8   7   7   7   
20 FT wind gust.            10  10  10  10  10  10  8   8   8   

.TONIGHT...

Sky/weather.........Partly cloudy (35-45 percent) then becoming 
                    mostly cloudy (65-75 percent). Haze early in 
                    the evening. Chance of showers early in the 
                    evening. Slight chance of thunderstorms late in 
                    the evening, then slight chance of showers 
                    overnight. 
CWR.................0 percent. 
Chance of lightning.15 percent. 
Min temperature.....Around 60. 
Max humidity........78-83 percent. 
Wind (20 ft)........Southwest winds 5 to 8 mph shifting to the 
                    south late in the evening. Gusty and erratic 
                    winds expected near thunderstorms late in the 
                    evening. 
Ridgetop wind.......Northwest 6 to 8 mph. 
Mixing height.......600 ft AGL. 
Transport winds.....Northwest around 8 mph shifting to the 
                    southwest 7 to 10 mph early in the evening. 
Ventilation Index...Poor (90) decreasing to poor (40) overnight. 

.WEDNESDAY...

Sky/weather.........Mostly sunny (40-50 percent). Slight chance of 
                    rain showers in the morning, then chance of 
                    rain showers late in the morning. Chance of 
                    thunderstorms late in the afternoon. Haze late 
                    in the afternoon. 
CWR.................8 percent. 
Chance of lightning.26 percent. 
Max temperature.....82-85. 
Min humidity........38-43 percent. 
Wind (20 ft)........Southwest winds 5 to 8 mph shifting to the 
                    northwest late in the afternoon. Gusty and 
                    erratic winds expected near thunderstorms late 
                    in the afternoon. 
Ridgetop wind.......North 6 to 8 mph.
Mixing height.......5200 ft AGL. 
Transport winds.....South 8 to 10 mph shifting to the northwest 
                    around 7 mph late in the afternoon. 
Ventilation Index...Poor (70) increasing to poor (140) in the afternoon. 

$$
Forecaster...NWS Seattle
Requested by...Ryan Scharnhorst
Type of request...WILDFIRE
.TAG 2521615.0/PDT
.DELDT 09/09/25
.FormatterVersion 2.0.0
.EMAIL ryan.scharnhorst@pullman-wa.gov