542
FNUS76 KPDT 300725
FWSPDT

Spot Forecast for N Ahtanum WUI...Yakama Agency
National Weather Service Pendleton OR
1225 AM PDT Mon Jun 30 2025

Forecast is based on ignition time of 0800 PDT on June 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 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.

...HEAT ADVISORY IN EFFECT FROM 9 AM THIS MORNING TO 9 PM PDT
TUESDAY...

.DISCUSSION...Moderate (43-53%) overnight humidity recoveries
Monday morning will lead to a hot, dry, and sunny day over the
fire area. Winds will stay light and diurnally driven as high
pressure lingers in the area. Clouds will increase overnight, but
little improvement in overnight recoveries is anticipated.
Temperatures will also be slightly warmer Tuesday, with slightly
higher winds expected as mixing heights increase due to an
approaching system to the south.

.REST OF TODAY...

Sky/weather.........Sunny (0-5 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....Around 100.
Min humidity........8-13 percent.
Wind (20 ft)........North winds 3 to 7 mph becoming 2 to 6 mph after
                    3 PM and becoming south after 5 PM
Mixing height.......8000 ft AGL.
Transport winds.....Northeast around 5 mph early in the morning
                    becoming light, then becoming west around 5 mph
                    late in the afternoon.
Ventilation Index...Poor (60).

TIME (PDT)      8 AM   10 AM  NOON   2 PM   4 PM   6 PM
Chc of ltng (%).0      0      0      0      0      0
Temp............71     84     91     93     96     97
RH..............37     27     19     15     14     15
20 ft wind......N 5    N 6    N 6    N 5    N 3    S 4
20 ft wind gust.              7

.TONIGHT...

Sky/weather.........Mostly clear (10-20 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....64-67.
Max humidity........44-49 percent.
Wind (20 ft)........South winds 2 to 6 mph shifting to the northwest
                    after 10 PM.
Mixing height.......500 ft AGL.
Transport winds.....Northwest 5 to 12 mph.
Ventilation Index...Fair (220) decreasing to poor (40) overnight.

.TUESDAY...

Sky/weather.........Sunny (10-20 percent).
CWR.................0 percent.
Chance of lightning.2 percent.
Max temperature.....100-103.
Min humidity........11-16 percent.
Wind (20 ft)........Northwest winds 5 to 10 mph shifting to the
                    southwest after 6 PM.
Mixing height.......10400 ft AGL.
Transport winds.....Northwest 6 to 9 mph shifting to the west 7 to
                    10 mph late in the afternoon.
Ventilation Index...Poor (60) increasing to fair (390) in the
                    afternoon.

$$
Forecaster...Callihan
Requested by...Dolores Moore
Type of request...PRESCRIBED
.TAG 2516871.0/PDT
.DELDT 06/30/25
.FormatterVersion 2.0.0
.EMAIL dolores_moore@yakama.com