FNUS76 KPDT 231336
FWSPDT

Spot Forecast for Balloon Tree...USFS
National Weather Service Pendleton OR
636 AM PDT Sun Aug 23 2026

Forecast is based on forecast start time of 0700 PDT on August 23. 
***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 transport wind
   multiplied by the mixing height in 100's of ft.
   Categories are a generalized indicator only: 
   low (< 200), moderate (200-500), high (500-700),
   and very high (> 700).                           ***

If you have questions or concerns with this forecast, please
contact our office at (541) 276-8134.

.DISCUSSION...Light downslope winds will become west to northwest
winds late in the morning through the evening hours. High pressure
building to the east will result in light east winds developing
across the fire area Monday. Afternoon RHs today will be in the
mid to upper 20s, with mid teens Monday. Temperatures are
expected to increase under the building high pressure through
Tuesday. Slightly unstable conditions will also develop through
Wednesday. 

.REST OF TODAY...

Sky/weather.........Sunny (5-15 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....74-77. 
Min humidity........27-32 percent. 
Wind (20 ft)........Downslope winds becoming west 5 to 10 mph
					around 10AM, then shifting to the northwest
					around 4PM.
Ridgetop wind.......West winds 5 to 8 mph increasing to 6 to 12 mph
					around 10AM, then shifting to the northwest
					around 4PM. 
Mixing height.......4700 ft AGL. 
Transport winds.....West 10 to 14 mph. 
Ventilation Index...Low (120) increasing to high (510) in the 
                    afternoon. 

TIME (PDT)      7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0   
Temp............53  55  58  62  66  69  71  73  73  73  74  72  
RH..............75  73  66  57  48  42  37  34  33  33  32  33  
20 FT wind dir..W   W   W   W   W   W   W   W   W   NW  NW  NW  
20 FT wind spd..3   4   4   5   6   7   8   8   9   9   9   7   
20 FT wind gust.                                    13  13   

.TONIGHT...

Sky/weather.........Mostly clear (15-25 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Min temperature.....51-54. 
Max humidity........49-54 percent. 
Wind (20 ft)........Northwest winds 5 to 10 mph becoming downslope
					winds after 11PM.
Ridgetop wind.......Northwest winds 5 to 11 mph shifting to the
					north 3 to 6 mph around 1AM. 
Mixing height.......500 ft AGL in the evening and overnight. 
Transport winds.....Northwest 7 to 13 mph shifting to the northeast 
                    around 7 mph early in the morning. 
Ventilation Index...Low (150) decreasing to low (30) overnight. 

.MONDAY...

Sky/weather.........Sunny (20-30 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....84-87. 
Min humidity........15-20 percent. 
Wind (20 ft)........Downslope winds becoming east winds 3 to 6 mph
					around 10AM.
Ridgetop wind.......North winds 3 to 6 mph shifting to the east
					4 to 7 mph around 10AM. 
Mixing height.......7700 ft AGL early in the morning. 
Transport winds.....East 6 to 7 mph shifting to the southwest 5 to 
                    8 mph late in the morning, then becoming light 
                    late in the afternoon. 
Ventilation Index...Low (50) increasing to moderate (350) in the 
                    afternoon. 

$$
Forecaster...Lawhorn
Requested by...IC Weseman
Type of request...WILDFIRE
.TAG 2620299.0/PDT
.DELDT 08/23/26
.FormatterVersion 2.0.0
.EMAIL orbmc@firenet.gov