676
FNUS76 KPDT 211138
FWSPDT
SPOT FORECAST FOR MCCULLY FIRE...USFS
NATIONAL WEATHER SERVICE PENDLETON OR
438 AM PDT MON SEP 21 2026
FORECAST IS BASED ON FORECAST START TIME OF 0600 PDT ON SEPTEMBER 21.
***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
ELEVATED FIRE WEATHER CONDITIONS WITH DRY AIR PERSISTING
WITH MINIMUM RELATIVE HUMIDITIES DROPPING IN THE 30 TO 40 PERCENT RANGE.
WINDS OVERALL WILL BE LIGHT AND VARIABLE IN GENERAL, BUT COULD SEE SOME
BREEZY WINDS DEVELOP IN THE LATE MORNING THROUGH LATE AFTERNOON HOURS.
WITH SUSTAINED WINDS AT 7 TO 12 MPH, A BRIEF 15 TO 25 MPH GUST IS POSSIBLE.
TODAY
SKY/WEATHER.........PARTLY SUNNY (55-65 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.2 PERCENT.
MAX TEMPERATURE.....67-72.
MIN HUMIDITY........30-35 PERCENT.
WIND (20 FT)........SOUTHEAST WINDS 5 TO 10 MPH, SHIFTING TO THE
SOUTH AT 7 TO 12 MPH BY 10 AM. WINDS SHIFT
TOWARDS THE SOUTHWEST BY 4 PM.
RIDGETOP WIND.......SOUTHEAST WINDS 7 TO 12 MPH, SHIFTING TO THE
SOUTH AT 10 TO 15 MPH BY 10 AM. WINDS SHIFT
TOWARDS THE SOUTHWEST BY 4 PM.
MIXING HEIGHT.......6200 FT AGL.
TRANSPORT WINDS.....SOUTH 10 TO 15 MPH BECOMING LIGHT.
VENTILATION INDEX...LOW (90-100) INCREASING TO MODERATE (440-460)
IN THE AFTERNOON.
TIME (PDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............48 48 50 53 58 60 63 65 65 66 65 65
RH..............57 60 61 54 49 46 43 39 36 34 35 35
20 FT WIND DIR..SE SE SE SE S S S S S S SW W
20 FT WIND SPD..7 7 7 8 8 8 8 7 6 6 5 4
20 FT WIND GUST.10 11 13 13 14 14 13 11 10 8 7 6
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.2 PERCENT.
MIN TEMPERATURE.....45-50.
MAX HUMIDITY........55-60 PERCENT.
WIND (20 FT)........LIGHT WINDS.
RIDGETOP WIND.......LIGHT WINDS.
MIXING HEIGHT.......3500 FT AGL EARLY IN THE EVENING.
TRANSPORT WINDS.....LIGHT WINDS BECOMING SOUTH 5 TO 10 MPH EARLY IN
THE EVENING, THEN BECOMING LIGHT OVERNIGHT
BECOMING NORTH 5 TO 10 MPH EARLY IN THE
MORNING.
VENTILATION INDEX...LOW (60-90) DECREASING TO LOW (30) OVERNIGHT.
TUESDAY
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.5 PERCENT.
MAX TEMPERATURE.....65-70.
MIN HUMIDITY........30-35 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING NORTHWEST 5 TO 10 MPH BY
11 AM.
RIDGETOP WIND.......LIGHT WINDS BECOMING NORTHWEST 7 TO 12 MPH BY
11 AM.
MIXING HEIGHT.......6300 FT AGL EARLY IN THE MORNING.
TRANSPORT WINDS.....NORTH 5 TO 10 MPH SHIFTING TO THE WEST 7 TO 12
MPH EARLY IN THE MORNING.
VENTILATION INDEX...LOW (30-40) INCREASING TO HIGH (610-650) IN THE
AFTERNOON.
FORECASTER...DAY
REQUESTED BY...LANE MCDONALD
TYPE OF REQUEST...WILDFIRE
.TAG 2621937.3/PDT
.DELDT 09/21/26
.FORMATTERVERSION 2.0.0
.EMAIL LANE.MCDONALD@USDA.GOV,LANEMCD23@GMAIL.COM
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