493
FNUS76 KOTX 061838
FWSOTX

Spot Forecast for WILDLAND FIRE - Rural Mattawa....Grant County Emergency Management
National Weather Service Spokane WA
1138 AM PDT Sat Jun 6 2026

Forecast is based on forecast start time of 1200 PDT on June 06.

.DISCUSSION...

Gusty west winds today behind a cold front passage. Winds will
peak late in the afternoon into the evening with gusts up to
25 to 30 mph. Decaying showers from the west may also result in
brief higher gusts to around 30 mph for the early afternoon
hours today. Winds remain breezy tonight into Sunday.

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.........Mostly sunny. A 20 percent chance for very
                    light rain or sprinkles from a decaying
                    shower.
CWR.................0 percent.
Chance of lightning.5 percent.
Max temperature.....70.
Min humidity........20-24 percent.
Wind (20 ft)........West winds 11 to 14 mph in the morning
                    increasing 14 to 17 mph in the afternoon.
                    Gusts up to 20 mph in the morning increasing
                    25 to 30 mph in the afternoon.
Mixing height.......8500 ft AGL.
Transport winds.....West around 17 mph.
Ventilation Index...Very high (1244).

.TONIGHT...

Sky/weather.........Mostly clear.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....Around 45.
Max humidity........61 percent.
Wind (20 ft)........West-Northwest winds 14 to 17 mph in the evening
                    decreasing 11 to 14 mph around midnight. Gusts
                    up to 30 mph in the evening decreasing to
                    around 20 mph overnight.
Mixing height.......6000 ft AGL falling to 1500 ft AGL.
Transport winds.....West around 17 mph.
Ventilation Index...Very high (804) decreasing to low (73)
                    overnight.

.SUNDAY...

Sky/weather.........Sunny.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....75.
Min humidity........17-21 percent.
Wind (20 ft)........West winds 10 to 13 mph in the morning
                    becoming wes-southwest in the afternoon.
                    Gusts up to between 18 to 20 mph.
Mixing height.......3500 ft AGL increasing to 8000 ft AGL in the
                    afternoon.
Transport winds.....West-Northwest 10 to 15 mph in the morning
                    becoming southwest in the afternoon.
Ventilation Index...High (664) increasing to high (714) in the
                    afternoon.

$$
Forecaster...SVH
Requested by...Jessica Olsen
Type of request...WILDFIRE
.TAG 2615078.0/OTX
.DELDT 06/06/26
.FormatterVersion 2.0.0
.EMAIL jrolsen@grantcountywa.gov