138
FNUS76 KPDT 232237
FWSPDT

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

Forecast is based on forecast start time of 1800 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...

Northwest winds This Evening will become lighter with time and variable
by the overnight hours. Winds remaining light and variable through Monday.
Minimum relative humidity around 30 percent this afternoon will see
improvement to near 55 percent overnight. No rain or dry thunderstorm
chances in the forecast.


.TONIGHT...

Sky/weather.........Mostly clear (5-15 percent). Patchy smoke late
                    in the evening.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....52-55.
Max humidity........50-55 percent.
Wind (20 ft)........Northwest winds 5 to 7 mph early in the evening
                    becoming light.
Ridgetop wind.......Northwest winds 10 to 16 mph early in the evening
                    becoming 5 to 7 mph.
Mixing height.......500 ft AGL in the evening and overnight.
Transport winds.....Northwest 7 to 13 mph shifting to the northeast
                    around 6 mph overnight.
Ventilation Index...Low (150) decreasing to low (30) overnight.

TIME (PDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............72  69  67  63  62  60  60  59  58  57  54  54
RH..............32  35  40  42  43  45  44  46  48  50  52  55
20 FT wind dir..NW  NW  NW  NW  NW  N   N   N   N   N   N   N
20 FT wind spd..6   5   3   3   3   2   2   2   2   2   2   2
20 FT wind gust.11  7   5   5   4

.MONDAY...

Sky/weather.........Mostly sunny (20-30 percent). Patchy smoke late
                    in the afternoon.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....85-88.
Min humidity........14-19 percent.
Wind (20 ft)........Light winds.
Ridgetop wind.......Light winds.
Mixing height.......6300 ft AGL early in the morning.
Transport winds.....East around 6 mph shifting to the southwest 5
                    to 7 mph late in the morning, then shifting to
                    the northeast around 7 mph late in the
                    afternoon.
Ventilation Index...Low (40) increasing to moderate (240) in the
                    afternoon.

.MONDAY NIGHT...

Sky/weather.........Partly cloudy (30-40 percent). Patchy smoke in
                    the evening.
CWR.................0 percent.
Chance of lightning.1 percent.
Min temperature.....59-62.
Max humidity........39-44 percent.
Wind (20 ft)........Light winds becoming northeast 5 to 7 mph early
                    in the evening, then becoming light late in the
                    evening.
Ridgetop wind.......Light winds becoming northeast 5 to 7 mph early
                    in the evening, then becoming light late in the
                    evening.
Mixing height.......500 ft AGL in the evening and overnight then
                    500 ft AGL early in the morning.
Transport winds.....Northeast 7 to 9 mph shifting to the southeast
                    around 6 mph early in the morning.
Ventilation Index...Low (150) decreasing to low (30) overnight.

$$
Forecaster...Russell
Requested by...IC Weseman
Type of request...WILDFIRE
.TAG 2620299.2/PDT
.DELDT 08/23/26
.FormatterVersion 2.0.0
.EMAIL orbmc@firenet.gov