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