FNUS76 KOTX 151808
FWSOTX

Spot Forecast for Swimptkin HFR...WA-CAC
National Weather Service Spokane WA
1108 AM PDT Thu Oct 15 2026

Forecast is based on ignition time of 1100 PDT on October 15. 
.DISCUSSION...

Relatively mild temperatures forecast the next couple days,
with high pressure building in. Skies will be mostly sunny today, 
then clouds start to increase tonight into Friday. Strong 
inversions develop quickly around sunset each night. Inversions 
lift in the mid to late morning near 0900-1100 hours. A dry cold 
front is forecast to push in Saturday toward late morning to early
afternoon, with slightly stronger winds, better mixing and the 
start of a slow cooling trend.
 
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). 
***************************************************************

.REST OF TODAY...

Sky/weather.........Sunny. 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....59-63. 
Min humidity........40-45 percent. 
Wind (20 ft)........Variable winds 2 to 4 mph before 1200...becoming
                    south winds 4 to 7 mph.
Mixing height.......2500 ft AGL.
Transport winds.....South 8 to 9 mph. 
Ventilation Index...Moderate (236). 

.TONIGHT...

Sky/weather.........Partly cloudy. 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Min temperature.....Around 36. 
Max humidity........76-82 percent. 
Wind (20 ft)........Variable 1 to 3 mph. 
Mixing height.......Near the surface. 
Transport winds.....South 8 to 9 mph. 
Ventilation Index...Low (38). 

.FRIDAY...

Sky/weather.........Partly sunny. 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....Around 58-62. 
Min humidity........37-41 percent. 
Wind (20 ft)........Variable 1 to 3 mph in the morning...becoming
                    south-southeast 5 to 9 mph with gusts to 14 mph
                    after 1100. 
Mixing height.......Near the surface in the morning...with the inversion
                    breaking near 0900-1000 rising to 2300 ft AGL in the 
                    afternoon. 
Transport winds.....South 9 to 13 mph. 
Ventilation Index...Moderate (258). 

$$
Forecaster...MSC
Requested by...VJ Elwell
Type of request...PRESCRIBED
.TAG 2623850.0/OTX
.DELDT 10/15/26
.FormatterVersion 2.0.0
.EMAIL twila.leith-monaghan.mtf@colvilletribes.com