047
FNUS76 KOTX 011309
FWSOTX

Spot Forecast for GNA Annie Handpile...USFS
National Weather Service Spokane WA
609 AM PDT Thu Oct 1 2026

Forecast is based on ignition time of 0700 PDT on October 01.
.DISCUSSION...

Moisture aloft will bring mid to high level clouds over the
burn unit today with a few sprinkles but no measurable rain
expected. Light winds and a slow lifting of the inversion
late in the morning. Warmer and trending drier into the
weekend.

If conditions become unrepresentative, contact the National Weather
Service.
***************************************************************
Forecasts for 20 foot wind speeds (valleys and ridge tops) are
10 minute averages reflecting RAWS wind.
***Ventilation Index is derived from transport wind
   multiplied by the mixing height divided by 100.
   Categories: low (< 200), moderate (200-500),
   high (500-800), and very high (> 800).
***************************************************************

.TODAY...

Sky/weather.........Mostly cloudy. A 30 percent chance for a
                    sprinkle.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....55.
Min humidity........41-45 percent.
Wind (20 ft)........East-Southeast winds up to 3 mph in the
                    morning becoming south 3 to 6 mph after 1200.
Mixing height.......Inversion lifting around 1130. Mixing height
                    Increasing to 2500 ft AGL between 1400 and
                    1800.
Transport winds.....Southeast around 3 mph in the morning
                    shifting to the south-southwest around 7 mph
                    in the afternoon.
Ventilation Index...Moderate (220).

.TONIGHT...

Sky/weather.........Mostly cloudy.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....40.
Max humidity........69-73 percent.
Wind (20 ft)........South-Southeast winds 1 to 4 mph.
Mixing height.......1000 ft AGL.
Transport winds.....South-Southeast around 4 mph.
Ventilation Index...Low (109).

.FRIDAY...

Sky/weather.........Mostly sunny.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....62.
Min humidity........44-48 percent.
Wind (20 ft)........Southwest winds 2 to 4 mph in the morning
                    becoming west-northwest 4 to 7 mph after
                    1400.
Mixing height.......Inversion lifting around 1200. Mixing height
                    increasing to 3000 ft AGL between 1400 and
                    1800.
Transport winds.....West around 7 mph.
Ventilation Index...Low (172) increasing to moderate (435) in the
                    afternoon.

$$
Forecaster...SVH
Requested by...Taylor Orteg
Type of request...PRESCRIBED
.TAG 2622683.3/OTX
.DELDT 10/01/26
.FormatterVersion 2.0.0
.EMAIL taylor.orteg@usda.gov