107
FNUS76 KOTX 302213
FWSOTX

Spot Forecast for SINLAHEKIN...DNR
National Weather Service Spokane WA
313 PM PDT Thu Jul 30 2026

Forecast is based on forecast start time of 1800 PDT on July 30.

...FIRE WEATHER WATCH IN EFFECT FROM SATURDAY MORNING THROUGH
SATURDAY EVENING...

.DISCUSSION...

Similar conditions are expected on Friday as to what occurred on
Thursday with warm and dry conditions and gusty winds in the
afternoon. Smoke will fill in the valley tonight into Friday
morning and may be dense. A strong but dry cold front will move
through the region Saturday, causing a significant increase in
southwesterly winds. Wind gusts up to 40 mph are anticipated
Saturday afternoon and Saturday 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).
***************************************************************

.TONIGHT...

Sky/weather.........Mostly clear. Smoke settling in valleys
                    in the evening.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....55-62.
Max humidity........35-45 percent.
Wind (20 ft)........South-southwest winds 6 to 11 mph with gusts up
                    to 18 mph through 2000 PDT, then becoming
                    downslope/downvalley 3 to 6 mph except northwest
                    4 to 8 mph on ridgetops.
Mixing height.......6500 ft AGL falling to near surface near 2000 PDT.
Transport winds.....Southwest around 12 mph shifting to the
                    northwest around 8 mph near 2000 PDT.
Ventilation Index...High (658) decreasing to low (38) overnight.

.FRIDAY...

Sky/weather.........Sunny. Smoke in the morning.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....94 at 1500 feet...76 at 5300 feet.
Min humidity........15-22 percent.
Wind (20 ft)........Northeast winds 2 to 5 mph shifting to the
                    southeast 5 to 11 mph around 1000 PDT. Gusts up
                    to 18 mph in the afternoon.
Mixing height.......Inversion lifting between 0800-0900 hours with
                    mixing height as high as 6500 ft AGL in the
                    afternoon.
Transport winds.....Northeast around 5 mph shifting to the south 7
                    to 12 mph in the late morning and afternoon.
Ventilation Index...Low (134) increasing to high (601) in the
                    afternoon.

.FRIDAY NIGHT...

Sky/weather.........Mostly clear. Smoke setting in valleys in the
                    evening.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....59-64.
Max humidity........38-48 percent.
Wind (20 ft)........South-southwest winds 6 to 11 mph through 2000 PDT,
                    then becoming downslope/downvalley 4 to 7 mph.
Mixing height.......6000 ft AGL falling to near surface near 2000 PDT.
Transport winds.....Southwest around 10 mph.
Ventilation Index...Moderate (470) decreasing to low (43)
                    overnight.

.SATURDAY...

Sky/weather.........Sunny.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....91 at 1500 feet...73 at 5300 feet.
Min humidity........17-22 percent.
Wind (20 ft)........Variable 3 to 6 mph through 1000 then becoming
                    southwest 10 to 20 mph. Gusts up to 40 mph
                    in the afternoon. Strongest winds on ridgetops
                    and west-southwest aspects.
Mixing height.......Near surface through 0800 increasing to 8500 ft
                    AGL in the afternoon.
Transport winds.....Southwest around 10 mph increasing to around 20
                    mph in the afternoon.
Ventilation Index...High (576) increasing to very high (1700) in
                    the afternoon.

.FORECAST DAYS 3...
.SUNDAY...
Mostly clear. Lows in the 40s. Highs 82 at 1500 feet, 64 at 5300 feet.
Min relative humidity 19-25 percent. North winds 5 to 10 mph.

$$
Forecaster...JW
Requested by...AARON COE
Type of request...WILDFIRE
.TAG 2618362.7/OTX
.DELDT 07/30/26
.FormatterVersion 2.0.0
.EMAIL AARON.COE@DNR.WA.GOV,kyle.wagner@dnr.wa.gov,WANEC@FIRENET.GOV,JIMMY.NICK@DNR.WA.GOV