478
FNUS76 KPDT 052252
FWSPDT

Spot Forecast for West Maintenance 5I...USFS
National Weather Service Pendleton OR
352 PM PDT Thu Jun 5 2025

Forecast is based on ignition time of 0800 PDT on June 06.
***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...Good recoveries (55-65%) Friday morning will lead to
a warming and drying trend through the period as high pressure
moves over the fire area from the west. Overnight recoveries
improve Friday night into Saturday morning, but afternoon
humidities will stay similar both days as highs bump up about 7
degrees. Diurnal winds will persist, but will be slightly higher
Saturday due to less cloud cover resulting in an uptick in mixing
height and Vent Index values.


.FRIDAY...

Sky/weather.........Sunny (15-25 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....80-84.
Min humidity........18-24 percent.
Wind (20 ft)........Light winds becoming southwest 3 to 7 mph by
                    8 AM, then shifting to the northwest
                    5 to 10 mph after 3 PM.
Mixing height.......7600 ft AGL.
Transport winds.....Light winds becoming west 5 to 6 mph late in
                    the morning, then shifting to the northwest
                    around 7 mph late in the afternoon.
Ventilation Index...Poor (30) increasing to fair (300) in the
                    afternoon.

TIME (PDT)      8 AM   10 AM  NOON   2 PM   4 PM   6 PM   8 PM
Chc of ltng (%).0      0      0      0      0      0      0
Temp............57     68     75     79     81     78     72
RH..............52     37     28     24     23     26     36
20 ft wind......SW 4   S 4    SW 4   NNE 5  NW 6   NW 7   NW 6
20 ft wind gust.5      5      6      9      10     11     10

.FRIDAY NIGHT...

Sky/weather.........Mostly clear (5-15 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....49-52.
Max humidity........70-75 percent.
Wind (20 ft)........Northwest winds 5 to 10 mph in the evening
                    becoming light after 9 PM.
Mixing height.......2200 ft AGL in the evening.
Transport winds.....North 6 to 8 mph in the evening and overnight
                    becoming light, then becoming southwest around
                    5 mph early in the morning.
Ventilation Index...Fair (280) decreasing to poor (30) overnight.

.SATURDAY...

Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....Around 90.
Min humidity........18-23 percent.
Wind (20 ft)........South southeast winds 3 to 7 mph becoming
                    northwest 4 to 8 mph around 3 PM, then
                    shifting from the west after 8 PM.
Mixing height.......8200 ft AGL early in the morning.
Transport winds.....Southwest 5 to 7 mph shifting to the west
                    around 6 mph late in the afternoon.
Ventilation Index...Poor (30) increasing to fair (310) in the
                    afternoon.

$$
Forecaster...Callihan
Requested by...USFS
Type of request...PRESCRIBED
.TAG 2515427.0/PDT
.DELDT 06/05/25
.FormatterVersion 2.0.0
.EMAIL christopher.duke@usda.gov