386
FNUS76 KPDT 170223
FWSPDT

Spot Forecast for ALDER SPRINGS...USFS
National Weather Service Pendleton OR
723 PM PDT Mon Jun 16 2025

Forecast is based on forecast start time of 0700 PDT on June 17.
***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 (62-72%) overnight recoveries Tuesday morning
will lead to slightly improved afternoon humidities and warmer
temperatures than on Monday. Winds will pick up late in the
afternoon due to a very weak system passing over the fire area. A
slightly more substantial system will pass on Wednesday,
increasing winds in the peak afternoon hours and providing more of
a northwest component. Overnight recoveries will be excellent
(74-79%) Wednesday morning with cooler high temperatures and
improved afternoon humidities.

.TUESDAY...

Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....82-85.
Min humidity........17-22 percent.
Wind (20 ft)........South winds 2 to 5 mph becoming west 5 to 10 mph
                    with gusts up to 20 mph after noon, peaking
                    between 4 PM and 8 PM.
Ridgetop wind.......South winds 4 to 7 mph becoming west 7 to 14 mph
                    with gusts up to 25 mph after noon, peaking
                    between 4 PM and 8 PM.
Mixing height.......6900 ft AGL.
Transport winds.....West around 12 mph.
Ventilation Index...Poor (70) increasing to excellent (710) in the
                    afternoon.

.TUESDAY NIGHT...

Sky/weather.........Mostly clear (0-10 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....46-49.
Max humidity........74-79 percent.
Wind (20 ft)........West winds 5 to 10 mph with gusts up to 20 mph
                    becoming 2 to 6 mph after 10 PM.
Ridgetop wind.......West winds 7 to 14 mph with gusts up to 25 mph
                    becoming 4 to 8 mph after 10 PM.
Mixing height.......500 ft AGL.
Transport winds.....West around 7 mph.
Ventilation Index...Fair (410) decreasing to poor (30) overnight.

.WEDNESDAY...

Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....80-83.
Min humidity........21-26 percent.
Wind (20 ft)........Light winds becoming northwest 5 to 10 mph with
                    gusts up to 20 mph after noon, peaking between
                    2 PM and 6 PM.
Ridgetop wind.......West winds 3 to 7 mph becoming northwest 7 to 14
                    mph with gusts up to 25 mph after noon, peaking
                    between 2 PM and 6 PM.
Mixing height.......7200 ft AGL.
Transport winds.....West around 11 mph.
Ventilation Index...Poor (80) increasing to good (630) in the
                    afternoon.

$$
Forecaster...Callihan
Requested by...ANDREW MYHRA
Type of request...WILDFIRE
.TAG 2516058.0/PDT
.DELDT 06/16/25
.FormatterVersion 2.0.0
.EMAIL ORCOC@FIRENET.GOV,ANDREW.MYHRA@USDA.GOV