FNUS76 KOTX 190115
FWSOTX

Spot Forecast for Waste Way...USFWS
National Weather Service Spokane WA
615 PM PDT Mon May 18 2026

Forecast is based on forecast start time of 0800 PDT on May 19. 
.DISCUSSION...

Mostly sunny and dry conditions will persist Tuesday and Wednesday. 
Afternoon Cascade gap winds Tuesday will increase down the Kittitas 
Valley bringing NW winds 15-20 mph gusting around 27 mph. 
Winds Wednesday will be lighter, but Cascade gap winds will 
bring another round of breezy NW winds in the evening. 

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). 
***************************************************************

.TUESDAY...

Sky/weather.........Mostly sunny. 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....77. 
Min humidity........21 percent. 
Wind (20 ft)........Northwest winds 6-10 mph increasing to 15-20 
                    mph around 1600 hours. Wind gusts up to 27 mph 
                    in the afternoon.
Mixing height.......6500 ft AGL. 
Transport winds.....West 11 to 20 mph. 
Ventilation Index...High (603) increasing to very high (967) in the 
                    afternoon. 

.TUESDAY NIGHT...

Sky/weather.........Mostly cloudy then becoming partly cloudy. 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Min temperature.....Around 50. 
Max humidity........61 percent. 
Wind (20 ft)........Northwest winds 9-13 mph decreasing to 
                    4-8 mph around 0200 hours. 
Mixing height.......Near surface.
Transport winds.....Northwest 11 to 14 mph. 
Ventilation Index...Very high (883) decreasing to low (58) 
                    overnight. 

.WEDNESDAY...

Sky/weather.........Sunny. 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....79. 
Min humidity........19 percent. 
Wind (20 ft)........Northwest winds 2-6 mph increasing to 6-11 
                    mph in the evening.
Mixing height.......8000 ft AGL. 
Transport winds.....North around 8 mph. 
Ventilation Index...Moderate (327) increasing to high (617) in the 
                    afternoon. 

$$
Forecaster...DB
Requested by...CWICC
Type of request...WILDFIRE
.TAG 2613988.0/OTX
.DELDT 05/18/26
.FormatterVersion 2.0.0
.EMAIL wacwc@firenet.gov