707 
FNUS76 KPDT 012158
FWSPDT

Spot Forecast for HWY 20 IFR...USFS
National Weather Service Pendleton OR
258 PM PDT Sun Jun 1 2025

Forecast is based on ignition time of 0800 PDT on June 02. 
***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...High pressure will be over the fire area through the
period. leading to slightly warming temperatures and clear skies.
Good overnight recoveries Monday morning will turn to excellent
recoveries Tuesday morning. There will also be a slight
improvement in afternoon humidities on Tuesday. A slight uptick in
instability on Tuesday will also lead to breezier afternoon 
conditions.


.MONDAY...

Sky/weather.........Sunny (5-15 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....74-78. 
Min humidity........17-22 percent. 
Wind (20 ft)........Light winds becoming northwest 5 to 10 mph after
                    2 PM. 
Mixing height.......6500 ft AGL. 
Transport winds.....Light winds becoming northwest 6 to 12 mph late 
                    in the morning. 
Ventilation Index...Poor (30) increasing to fair (370) 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............46     63     70     74     76     71     
RH..............47     32     25     22     23     26     
20 ft wind......E 2    E 2    NE 3   N 5    NW 7   NW 8   
20 ft wind gust.              7      10     14     14     

.MONDAY NIGHT...

Sky/weather.........Mostly clear (5-15 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Min temperature.....33-37. 
Max humidity........84-89 percent. 
Wind (20 ft)........Northwest winds 5 to 10 mph becoming light
                    and out of the west after 9 PM.
Mixing height.......700 ft AGL. 
Transport winds.....Northwest 5 to 12 mph. 
Ventilation Index...Fair (330) decreasing to poor (30) overnight. 

.TUESDAY...

Sky/weather.........Sunny (0-10 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....74-77. 
Min humidity........23-28 percent. 
Wind (20 ft)........Light winds becoming northwest 5 to 10 mph with 
                    gusts to around 16 mph after noon, peaking 
                    between 4 PM and 7 PM.
Mixing height.......6600 ft AGL. 
Transport winds.....West around 5 mph early in the morning becoming 
                    light, then becoming northwest 7 to 12 mph late 
                    in the morning. 
Ventilation Index...Poor (40) increasing to fair (400) in the 
                    afternoon. 

$$
Forecaster...Callihan
Requested by...RXB2
Type of request...PRESCRIBED
.TAG 2515154.0/PDT
.DELDT 06/01/25
.FormatterVersion 2.0.0
.EMAIL TJ.Whitehall@usda.gov