934
FNUS76 KPDT 180210
FWSPDT
SPOT FORECAST FOR DMPRC RX...DOD
NATIONAL WEATHER SERVICE PENDLETON OR
710 PM PDT WED SEP 17 2025
FORECAST IS BASED ON IGNITION TIME OF 0800 PDT ON SEPTEMBER 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 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 WEAK COLD FRONT WILL BE DISSIPATING EAST OF THE
FIRE AREA THROUGH THE PERIOD, AS A HIGH PRESSURE RIDGE DEVELOPS
ALONG THE COAST. THIS WILL PROMOTE BREEZY MORNING AND EVENING
CONDITIONS AS A PRESSURE GRADIENT DEVELOPS ALONG THE CASCADES,
WHICH WILL OCCUR AGAIN INTO FRIDAY MORNING DUE TO HIGH PRESSURE
TRACKING NORTH OF THE AREA. GOOD (60-70%) OVERNIGHT HUMIDITY
RECOVERIES THURSDAY MORNING, BUT BECOMING MORE MODERATE (50-60%)
FRIDAY MORNING AND CONTINUING ON THE TREND (45-55%) INTO SATURDAY
MORNING. THURSDAY'S INVERSION SHOULD BREAK AROUND 1000, WITH
FRIDAY'S BREAKING AROUND 0930.
THURSDAY
SKY/WEATHER.........SUNNY (5-15 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....79-82.
MIN HUMIDITY........25-30 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 8 TO 14 MPH WITH GUSTS UP TO
20 MPH POSSIBLE BEFORE 1100, THEN BECOMING
NORTH 3 TO 7 MPH THROUGH 1700 BEFORE
INCREASING BACK FROM THE NORTHWEST 8 TO 14
MPH WITH GUSTS UP TO 20 MPH.
MIXING HEIGHT.......4600 FT AGL.
TRANSPORT WINDS.....NORTHWEST 10 TO 18 MPH.
VENTILATION INDEX...POOR (40) INCREASING TO FAIR (200) 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 0 0 0 0 0 0 0
TEMP............59 63 67 71 74 76 78 79 79 79 77 71
RH..............60 52 46 41 38 35 32 30 28 27 32 38
20 FT WIND DIR..NW NW NW NW NW N N N N NW NW NW
20 FT WIND SPD..14 12 11 8 7 6 4 5 6 7 8 12
20 FT WIND GUST.18 16 15 12 10 9 8 9 10 11 16
THURSDAY NIGHT
SKY/WEATHER.........MOSTLY CLEAR (15-25 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....AROUND 60.
MAX HUMIDITY........50-55 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 10 TO 16 MPH.
MIXING HEIGHT.......2300 FT AGL EARLY IN THE EVENING.
TRANSPORT WINDS.....NORTHWEST 12 TO 20 MPH.
VENTILATION INDEX...POOR (140) DECREASING TO POOR (30) OVERNIGHT.
FRIDAY
SKY/WEATHER.........SUNNY (0-10 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....81-84.
MIN HUMIDITY........18-23 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 5 TO 10 MPH SHIFTING TO THE
WEST 2 TO 6 MPH AFTER 1000, THEN SHIFTING
TO THE SOUTH AROUND 1400, THEN FROM THE WEST
3 TO 7 MPH AFTER 1900.
MIXING HEIGHT.......5300 FT AGL LATE IN THE MORNING.
TRANSPORT WINDS.....NORTHWEST 5 TO 12 MPH SHIFTING TO THE WEST 5 TO
7 MPH LATE IN THE AFTERNOON.
VENTILATION INDEX...POOR (30) INCREASING TO POOR (120) IN THE
AFTERNOON.
FORECASTER...CALLIHAN
REQUESTED BY...JEREMY JOHNSON
TYPE OF REQUEST...PRESCRIBED
.TAG 2522127.0/PDT
.DELDT 09/17/25
.FORMATTERVERSION 2.0.0
.EMAIL JEREMY.D.JOHNSON151.CIV@ARMY.MIL
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