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
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