489
FNUS76 KOTX 060046
FWSOTX

Spot Forecast for Rock fire...US wildland fire service
National Weather Service Spokane WA
546 PM PDT Sat Sep 5 2026

Forecast is based on forecast start time of 1700 PDT on September 05.
.DISCUSSION...

Shower and thunderstorm chances will decrease over the area
through 2000. Winds will shift to North and increase overnight
with a passing system. Shower and thunderstorm chances expected to
be lower on Sunday as the area is in a cooler, drier flow
pattern. Little to no accumulation expected.

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 cloudy. Chance of thunderstorms through
                    the evening.
CWR.................0 percent.
Chance of lightning.35 percent.
Max temperature.....Around 69.
Min humidity........35-40 percent.
Wind (20 ft)........South winds around 4 to 8 mph. Gusty erratic winds
                    with thunderstorms.
Mixing height.......6000 ft AGL.
Transport winds.....Southwest around 5 to 10 mph.
Ventilation Index...Moderate (347).

.TONIGHT...

Sky/weather.........Mostly cloudy.
CWR.................0 percent.
Chance of lightning.5 percent.
Min temperature.....Around 50.
Max humidity........60-65 percent. Fair recovery.
Wind (20 ft)........North winds 4 to 8 mph with gusts up to 15 mph
                    after 0200.
Mixing height.......6000 ft AGL falling to near surface after 2000.
Transport winds.....Northwest 10 to 18 mph.
Ventilation Index...Moderate (232).

.SUNDAY...

Sky/weather.........Partly sunny. Slight chance of showers.
CWR.................0 percent.
Chance of lightning.5 percent.
Max temperature.....Around 70.
Min humidity........33-38 percent.
Wind (20 ft)........North winds 8 to 12 mph. Becoming Northeast 4
                    to 8 mph after 0900.
Mixing height.......Inversion break around 0700. 1000 ft AGL at 0800
                    increasing to 7000 ft AGL in the afternoon.
Transport winds.....North 10 to 15 mph.
Ventilation Index...Moderate (366) increasing to moderate (410) in
                    the afternoon.

$$
Forecaster...JCLEV
Requested by...Brandon Williams
Type of request...WILDFIRE
.TAG 2621301.0/OTX
.DELDT 09/05/26
.FormatterVersion 2.0.0
.EMAIL brandon_williams@fws.gov