547
FNUS76 KPDT 291711
FWSPDT
SPOT FORECAST FOR RANGE 4 5 6...US ARMY YAKIMA TRAINING CENTER
NATIONAL WEATHER SERVICE PENDLETON OR
1011 AM PDT WED APR 29 2026
FORECAST IS BASED ON IGNITION TIME OF 0800 PDT ON APRIL 30.
***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
WARM, DRY CONDITIONS ARE FORECAST TO CONTINUE THURSDAY
AND FRIDAY FOR THE BURN SITE. WINDS WILL BE PREDOMINANTLY DIURNALLY
AND TERRAIN-DRIVEN, STRONGEST DURING THE AFTERNOON AND EVENING HOURS.
AFTERNOON RH IS EXPECTED TO BE LOW, FOLLOWED BY MODERATE OVERNIGHT
RECOVERY. NOCTURNAL INVERSIONS ARE FORECAST TO BREAK AROUND 0900-1000
EACH MORNING, FOLLOWED BY DEEP MIXING HEIGHTS (7000-7500 FT AGL)
LATE MORNING AND AFTERNOON.
THURSDAY
SKY/WEATHER.........MOSTLY SUNNY TO PARTLY CLOUDY (5-30 PERCENT).
CWR.................0 PERCENT.
MAX TEMPERATURE.....72-75.
MIN HUMIDITY........16-21 PERCENT.
WIND (20 FT)........VARIABLE 2-5 MPH EARLY MORNING, BECOMING EAST
WINDS 5-10 MPH BY MID-MORNING.
RIDGETOP WIND.......EAST WINDS 4-8 MPH EARLY MORNING, INCREASING
TO 6-12 MPH BY MID-MORNING WITH GUSTS OF 12-17 MPH.
MIXING HEIGHT.......INCREASING TO 7000-7500 FT AGL BY LATE MORNING.
TRANSPORT WINDS.....EAST 6-10 MPH.
VENTILATION INDEX...LOW (90-100) INCREASING TO HIGH (510-540) IN
THE AFTERNOON.
TIME (PDT) 8 AM 10 AM NOON 2 PM 4 PM 6 PM
TEMP............53 63 69 70 71 70
RH..............53 40 31 27 23 25
20 FT WIND......VRB 5 E 5 E 6 E 7 E 7 E 7
20 FT WIND GUST. 12 12 12 12
THURSDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY (30-45 PERCENT).
CWR.................0 PERCENT.
MIN TEMPERATURE.....46-49.
MAX HUMIDITY........55-60 PERCENT.
WIND (20 FT)........EAST TO SOUTHEAST WINDS 4-8 MPH IN THE EVENING
BECOMING DRAINAGE 1-5 MPH OVERNIGHT.
RIDGETOP WIND.......EAST TO SOUTHEAST WINDS 5-9 MPH IN THE EVENING
BECOMING 1-5 MPH OVERNIGHT.
MIXING HEIGHT.......DECREASING TO 200-500 FT AGL OVERNIGHT.
TRANSPORT WINDS.....EAST TO SOUTHEAST 4-7 MPH.
VENTILATION INDEX...DECREASING TO LOW (30) OVERNIGHT.
FRIDAY
SKY/WEATHER.........PARTLY CLOUDY (25-60 PERCENT).
CWR.................0 PERCENT.
MAX TEMPERATURE.....76-79.
MIN HUMIDITY........18-23 PERCENT.
WIND (20 FT)........VARIABLE WINDS 1-5 MPH EARLY MORNING, BECOMING EAST
TO SOUTHEAST 4-8 MPH BY MID-MORNING.
RIDGETOP WIND.......EAST TO SOUTHEAST WINDS 1-5 MPH EARLY MORNING,
INCREASING TO 5-9 MPH BY MID-MORNING.
MIXING HEIGHT.......INCREASING TO 7000-7500 FT AGL BY LATE MORNING.
TRANSPORT WINDS.....NORTHEAST 4-6 MPH SHIFTING TO THE SOUTH 6-9 MPH LATE
MORNING.
VENTILATION INDEX...LOW (30) INCREASING TO MODERATE (450) IN THE
AFTERNOON.
FORECASTER...PLUNKETT
REQUESTED BY...KARI THOMAS - FIREFIGHTER/EMT
TYPE OF REQUEST...PRESCRIBED
.TAG 2611846.3/PDT
.DELDT 04/29/26
.FORMATTERVERSION 2.0.0
.EMAIL JEREMY.D.JOHNSON151.CIV@ARMY.MIL,KARI.A.THOMAS5.CIV@ARMY.MIL,JOSHUA.A.THOMPSON36.CIV@ARMY.MIL,HEATH.G.BICHEL.CIV@ARMY.MIL
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