FNUS76 KOTX 151632
FWSOTX

Spot Forecast for South Twin WUI...WA-CAC
National Weather Service Spokane WA
932 AM PDT Thu Oct 15 2026

Forecast is based on ignition time of 0900 PDT on October 15. 
.DISCUSSION...

Temperatures gradually trend warmer and drier for Thursday and 
Friday under mostly clear skies as high pressure builds. Strong 
inversions will develop quickly around sunset each night along 
with good, trapping smoke in drainages through the morning. 
Inversions will lift in the late morning near 1000-1100 hours 
Thursday and Friday. Winds will generally be light on Thursday 
with speeds less than 5 mph. Winds will increase from the south 
Friday afternoon.
 
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.........Sunny becoming mostly sunny with passing 
                    high cirrus clouds in the afternoon.
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....61. 
Min humidity........35-50 percent. 
Wind (20 ft)........East-southeast 2 to 5 mph.
Mixing height.......Inversion lifting around 1000 hours with mixing 
                    height as high as 2300 ft AGL between 1300-1600 hours.
Transport winds.....East around 5 mph. 
Ventilation Index...Low (137). 

.TONIGHT...

Sky/weather.........Partly cloudy. 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Min temperature.....39. 
Max humidity........70-75 percent. 
Wind (20 ft)........Becoming north 2 to 5 mph in the evening. 
Mixing height.......Near the surface between 1700-1800 hours.
Transport winds.....Northeast 6 to 7 mph. 
Ventilation Index...Low (30). 

.FRIDAY...

Sky/weather.........Mostly sunny. 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....63. 
Min humidity........30-35 percent. 
Wind (20 ft)........Southeast 1 to 3 mph after 1000 hours becoming 
                    south 4 to 7 mph after 1200 hours. Gusts up to 13 
                    mph in the afternoon.
Mixing height.......Inversion lifting around 1100 hours with mixing 
                    height as high as 2500 ft AGL between 1300-1600 hours.
Transport winds.....Northeast around 6 mph shifting to the south 
                    around 9 mph in the afternoon. 
Ventilation Index...Moderate (217). 

$$
Forecaster...VT
Requested by...Dennis Ranalla
Type of request...PRESCRIBED
.TAG 2623841.0/OTX
.DELDT 10/15/26
.FormatterVersion 2.0.0
.EMAIL twila.leith-monaghan.mtf@colvilletribes.com