599
FNUS76 KPDT 170203
FWSPDT
SPOT FORECAST FOR PORCUPINE RIDGE...USDA FOREST SERVICE
NATIONAL WEATHER SERVICE PENDLETON OR
703 PM PDT THU JUL 16 2026
FORECAST IS BASED ON FORECAST START TIME OF 1900 PDT ON JULY 16.
***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
HIGH PRESSURE CONTINUES TO BUILD TONIGHT AND SETS UP
THROUGH THE REMAINDER OF THE WEEK, KEEPING SKIES CLEAR AND
INITIATING A SLIGHT WARMING AND DRYING TREND. WINDS WILL SLOWLY
SUBSIDE OVERNIGHT AS A INVERSION SETS UP AND BREAKS BY 0700 ON
FRIDAY. DIURNAL WIND SHIFTS FROM WEST-SOUTHWEST IN THE MORNING TO
NORTHWEST BY THE AFTERNOON BOTH FRIDAY AND SATURDAY.
REST OF TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (0-10 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....54-57.
MAX HUMIDITY........60-65 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 7 TO 15 MPH WITH GUSTS TO
AROUND 23 MPH SHIFTING TO THE WEST 3 TO 7 MPH
AFTER MIDNIGHT.
RIDGETOP WIND.......NORTHWEST WINDS 10 TO 17 MPH WITH GUSTS TO
AROUND 26 MPH SHIFTING TO THE WEST 4 TO 8 MPH
AFTER MIDNIGHT.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....WEST 13 TO 21 MPH BECOMING SOUTHWEST 6 TO 8 MPH
OVERNIGHT.
VENTILATION INDEX...MODERATE (340-360) DECREASING TO LOW (60)
OVERNIGHT.
TIME (PDT) 7 PM 9 PM 11 PM 1 AM 3 AM 5 AM
CHC OF LTNG (%).0 0 0 0 0 0
TEMP............79 69 65 61 57 56
RH..............42 50 54 58 61 64
20 FT WIND......NW 15 NW 11 NW 7 W 5 W 5 W 6
20 FT WIND GUST.23 19 18 13 10 10
FRIDAY
SKY/WEATHER.........SUNNY (0-10 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....86-89.
MIN HUMIDITY........18-23 PERCENT.
WIND (20 FT)........WEST WINDS 5 TO 10 MPH SHIFTING TO THE
NORTHWEST 10 TO 15 MPH WITH GUSTS UP TO 22
MPH AFTER 1400, PEAKING BETWEEN 1700-2000.
RIDGETOP WIND.......WEST WINDS 6 TO 12 MPH SHIFTING TO THE
NORTHWEST 12 TO 17 MPH WITH GUSTS UP TO 25
MPH AFTER 1400, PEAKING BETWEEN 1700-2000.
MIXING HEIGHT.......4200 FT AGL.
TRANSPORT WINDS.....WEST 6 TO 13 MPH SHIFTING TO THE NORTHWEST
AROUND 15 MPH LATE IN THE AFTERNOON.
VENTILATION INDEX...LOW (70) INCREASING TO MODERATE (350) IN THE
AFTERNOON.
FRIDAY NIGHT
SKY/WEATHER.........MOSTLY CLEAR (5-15 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....56-59.
MAX HUMIDITY........51-56 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 10 TO 15 MPH SHIFTING TO THE
SOUTHWEST 2 TO 6 MPH OVERNIGHT.
RIDGETOP WIND.......NORTHWEST WINDS 12 TO 17 MPH SHIFTING TO THE
SOUTHWEST 3 TO 7 MPH OVERNIGHT.
MIXING HEIGHT.......500 FT AGL IN THE EVENING AND OVERNIGHT.
TRANSPORT WINDS.....NORTHWEST 8 TO 15 MPH SHIFTING TO THE SOUTHWEST
5 TO 6 MPH OVERNIGHT.
VENTILATION INDEX...MODERATE (250) DECREASING TO LOW (30)
OVERNIGHT.
SATURDAY
SKY/WEATHER.........SUNNY (0-10 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....AROUND 90.
MIN HUMIDITY........15-20 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 2 TO 6 MPH SHIFTING TO THE
NORTHWEST 10 TO 15 MPH WITH GUSTS UP TO 20
MPH AFTER NOON, PEAKING BETWEEN 1600-1900.
RIDGETOP WIND.......SOUTHWEST WINDS 3 TO 7 MPH SHIFTING TO THE
NORTHWEST 12 TO 17 MPH WITH GUSTS UP TO 23
MPH AFTER NOON, PEAKING BETWEEN 1600-1900.
MIXING HEIGHT.......5200 FT AGL EARLY IN THE MORNING.
TRANSPORT WINDS.....WEST 5 TO 12 MPH INCREASING TO AROUND 15 MPH
LATE IN THE AFTERNOON.
VENTILATION INDEX...LOW (30) INCREASING TO MODERATE (370) IN THE
AFTERNOON.
FORECASTER...CALLIHAN
REQUESTED BY...GARRISON LUPTON
TYPE OF REQUEST...WILDFIRE
.TAG 2617526.0/PDT
.DELDT 07/16/26
.FORMATTERVERSION 2.0.0
.EMAIL GARRISON.LUPTON@USDA.GOV
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