840
FNUS76 KPDT 100100
FWSPDT
SPOT FORECAST FOR TIDDLYWINKS 4...USFS DESCHUTES NF BEND/FT ROCK
NATIONAL WEATHER SERVICE PENDLETON OR
600 PM PDT THU APR 9 2026
FORECAST IS BASED ON IGNITION TIME OF 1800 PDT ON APRIL 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 SLOW MOVING SYSTEM IS LIFTING INTO THE FIRE AREA
FROM THE SOUTH THROUGH TOMORROW, BRINGING CHANCES FOR SHOWERS AND
ISOLATED AFTERNOON THUNDERSTORMS. A WETTING RAIN IS EXPECTED WITH
THE RAIN THIS EVENING, WITH AN ADDITIONAL 0.20" FRIDAY AND AROUND
0.10" ON SATURDAY. THE MAJORITY OF RAINFALL FRIDAY WILL OCCUR
AFTER 1700, WITH SATURDAYS RAIN AMOUNTS LIKELY THROUGH THE PEAK
AFTERNOON HOURS. PEAK WINDS WILL OCCUR FRIDAY AFTERNOON/EVENING
AND SATURDAY MORNING WITH GUSTS AROUND 20 MPH POSSIBLE.
TRANSPORT WINDS OF 15-20 MPH FRIDAY AFTERNOON/EVENING AND 20-25
MPH SATURDAY MORNING.
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). 50-60 PERCENT
CHANCE OF RAIN SHOWERS AND A 15-20 PERCENT
CHANCE OF THUNDERSTORMS BEFORE 2300.
CWR.................52 PERCENT DECREASING TO 1 PERCENT LATE IN THE
EVENING.
CHANCE OF LIGHTNING.18 PERCENT.
MIN TEMPERATURE.....38-43.
MAX HUMIDITY........90-95 PERCENT.
WIND (20 FT)........NORTH WINDS 4 TO 8 MPH SHIFTING TO THE
WEST 2 TO 4 MPH AFTER 2200 THEN LIGHT AND
VARIABLE AFTER MIDNIGHT. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS EARLY IN THE
EVENING.
RIDGETOP WIND.......NORTH WINDS 5 TO 10 MPH SHIFTING TO THE WEST
3 TO 5 MPH AFTER 2200 THEN LIGHT AND VARIABLE
AFTER MIDNIGHT.
MIXING HEIGHT.......900 FT AGL.
TRANSPORT WINDS.....NORTH 7 TO 12 MPH IN THE EVENING AND OVERNIGHT
BECOMING LIGHT, THEN BECOMING SOUTH AROUND 5
MPH EARLY IN THE MORNING.
VENTILATION INDEX...FAIR (220) DECREASING TO POOR (40) OVERNIGHT.
TIME (PDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
CHC OF LTNG (%).20 20 10 10 10 0 0 0 0 0 0 0
TEMP............62 58 54 51 49 47 46 44 43 42 42 41
RH..............40 44 53 61 64 69 70 73 76 79 80 84
20 FT WIND DIR..NE N N N W W SW E SE NW N NW
20 FT WIND SPD..5 6 6 6 2 3 3 1 2 2 2 5
20 FT WIND GUST.14 15 15 13 6 6 7
FRIDAY
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). 25-35 PERCENT
CHANCE OF RAIN AFTER 1100 INCREASING TO 80-90
PERCENT CHANCE OF RAIN AFTER 1600. 30-40
PERCENT CHANCE THUNDERSTORMS AFTER 1500,
BECOMING A 50-60 PERCENT CHANCE BETWEEN 1700
AND 2100.
CWR.................0 PERCENT INCREASING TO 81 PERCENT.
CHANCE OF LIGHTNING.35 PERCENT BECOMING A 55 PERCENT CHANCE AFTER
1700.
MAX TEMPERATURE.....62-65.
MIN HUMIDITY........43-48 PERCENT.
WIND (20 FT)........LIGHT WEST WINDS 2 TO 5 MPH BECOMING SOUTHWEST
6 TO 12 MPH WITH GUSTS UP TO 20 MPH AFTER
1000. WINDS PEAK BETWEEN 1100 AND 1400 AND
AGAIN BETWEEN 1700 AND 1900. GUSTY AND
ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
LATE IN THE AFTERNOON.
RIDGETOP WIND.......LIGHT WEST WINDS 3 TO 7 MPH BECOMING SOUTHWEST
7 TO 14 MPH WITH GUSTS UP TO 25 MPH AFTER 1000.
WINDS PEAK BETWEEN 1100 AND 1400 AND AGAIN
BETWEEN 1700 AND 1900. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS.
MIXING HEIGHT.......5300 FT AGL.
TRANSPORT WINDS.....SOUTH 5 TO 10 MPH INCREASING TO 12 TO 15 MPH
LATE IN THE MORNING.
VENTILATION INDEX...POOR (90) INCREASING TO GOOD (630) IN THE
AFTERNOON.
FRIDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). 80-90 PERCENT
CHANCE OF RAIN SHOWERS BEFORE 2300, THEN A
40-50 PERCENT CHANCE OVERNIGHT. 30-40 PERCENT
CHANCE OF THUNDERSTORMS BEFORE 2200.
CWR.................81 PERCENT DECREASING TO 9 PERCENT LATE IN THE
EVENING.
CHANCE OF LIGHTNING.35 PERCENT.
MIN TEMPERATURE.....37-42.
MAX HUMIDITY........94-99 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 6 TO 12 MPH WITH GUSTS UP TO
20 MPH BECOMING 3 TO 7 MPH AFTER 2100. GUSTY
AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
EARLY IN THE EVENING.
RIDGETOP WIND.......SOUTHWEST WINDS 7 TO 14 MPH WITH GUSTS UP TO
25 MPH BECOMING 4 TO 8 MPH AFTER 2100. GUSTY
AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
EARLY IN THE EVENING.
MIXING HEIGHT.......1300 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 6 TO 13 MPH.
VENTILATION INDEX...FAIR (230) DECREASING TO POOR (80) OVERNIGHT.
SATURDAY
SKY/WEATHER.........PARTLY SUNNY (60-70 PERCENT) THEN BECOMING
MOSTLY CLOUDY (80-90 PERCENT) AFTER 1100.
40-50 PERCENT CHANCE OF RAIN BECOMING AN
80-90 PERCENT CHANCE AFTER 1100. 30-40 PERCENT
CHANCE OF THUNDERSTORMS AFTER 1100, PEAKING
BETWEEN 1400 AND 1700.
RAIN LIKELY LATE IN THE AFTERNOON.
CWR.................9 PERCENT INCREASING TO 41 PERCENT LATE IN THE
MORNING, THEN DECREASING TO 30 PERCENT LATE IN
THE AFTERNOON.
CHANCE OF LIGHTNING.35 PERCENT.
MAX TEMPERATURE.....55-60.
MIN HUMIDITY........52-57 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 3 TO 7 MPH BECOMING 6 TO 12 MPH
WITH GUSTS UP TO 20 MPH AFTER 0800 AND PEAKING
BETWEEN 0800 AND NOON. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS LATE IN THE
MORNING.
RIDGETOP WIND.......SOUTHWEST WINDS 4 TO 8 MPH BECOMING 7 TO 15 MPH
WITH GUSTS UP TO 25 MPH AFTER 0800 AND PEAKING
BETWEEN 0800 AND NOON. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS LATE IN THE
MORNING.
MIXING HEIGHT.......6200 FT AGL.
TRANSPORT WINDS.....SOUTH 13 TO 21 MPH INCREASING TO AROUND 26 MPH
LATE IN THE AFTERNOON.
VENTILATION INDEX...FAIR (240) INCREASING TO EXCELLENT (890) IN THE
AFTERNOON.
FORECASTER...CALLIHAN
REQUESTED BY...NICHOLAS FOEY
TYPE OF REQUEST...PRESCRIBED
.TAG 2609890.0/PDT
.DELDT 04/09/26
.FORMATTERVERSION 2.0.0
.EMAIL NICHOLAS.FOEY@USDA.GOV,TIERNAN.KOBLER@USDA.GOV
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