324
FNUS76 KPDT 042120
FWSPDT

Spot Forecast for West Maintenance 5I...USFS
National Weather Service Pendleton OR
220 PM PDT Wed Jun 4 2025

Forecast is based on ignition time of 0800 PDT on June 05.
***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...Dry conditions will continue to impact the fire
site into the weekend. Winds will be diurnally driven, with
northeast winds developing Thursday afternoon, and northwest
winds Friday. RHs will be in the lower to mid 20s tomorrow
afternoon, and mid teens to lower 20s Friday. Overnight recovery
will be moderate to good.

.THURSDAY...

Sky/weather.........Sunny (5-15 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....74-77.
Min humidity........23-28 percent.
Wind (20 ft)........Northeast winds 5 to 8 mph.
Mixing height.......6100 ft AGL.
Transport winds.....Northeast 9 to 13 mph.
Ventilation Index...Poor (110) increasing to fair (430) in the
                    afternoon.

TIME (PDT)      8 AM   10 AM  NOON   2 PM   4 PM   6 PM
Chc of ltng (%).0      0      0      0      0      0
Temp............48     59     67     71     74     72
RH..............60     48     31     28     24     30
20 ft wind......NE 5   NE 5   NE 7   NE 8   NE 8   NE 8
20 ft wind gust.7      7      12     14     14     14

.THURSDAY NIGHT...

Sky/weather.........Partly cloudy (20-30 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....46-49.
Max humidity........60-65 percent.
Wind (20 ft)........North winds 5 to 8 mph in the evening and
                    overnight becoming downslope winds after
11PM.
Mixing height.......500 ft AGL.
Transport winds.....North 8 to 16 mph shifting to the northeast
                    around 5 mph early in the morning.
Ventilation Index...Fair (400) decreasing to poor (50) overnight.

.FRIDAY...

Sky/weather.........Mostly sunny (30-40 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....82-85.
Min humidity........17-22 percent.
Wind (20 ft)........Downslope winds becoming southwest 5 to 7 mph
after 9AM, then shifting to the northwest
                    5 to 8 mph after 12PM.
Mixing height.......7600 ft AGL.
Transport winds.....Northeast around 5 mph shifting to the south
                    early in the morning, then shifting to the west
                    6 to 7 mph late in the morning.
Ventilation Index...Poor (30) increasing to fair (340) in the
                    afternoon.

$$
Forecaster...Lawhorn
Requested by...USFS
Type of request...PRESCRIBED
.TAG 2515350.0/PDT
.DELDT 06/04/25
.FormatterVersion 2.0.0
.EMAIL christopher.duke@usda.gov