153
FNUS76 KOTX 262153
FWSOTX

Spot Forecast for Sinlahekin...USFS
National Weather Service Spokane WA
253 PM PDT Sat Sep 26 2026

Forecast is based on forecast start time of 0600 PDT on September 27.
.DISCUSSION...

Seasonal fall weather conditions over the fire. Overnight
temperatures will be chilly with lows down to around 40. Mostly sunny
skies with light winds today. A weather system will approach on
Monday with increased southerly winds up the Okanogan Valley and on
Ridges in the afternoon. Moisture increases Monday night into Tuesday
with increasing clouds, but little to no precipitation is 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).
***************************************************************

.SUNDAY...

Sky/weather.........Mostly sunny.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....Valleys (below 3000 ft)...63-67.
                    Ridges  (above 5000 ft)...54-58.
Min humidity........Valleys (below 3000 ft)...31-37 percent.
                    Ridges  (above 5000 ft)...41-45 percent.
Wind (20 ft)........Valleys to midslopes: Downslope/Down-valley
                    winds 2 to 4 mph early in the morning becoming
                    upslope/up-valley 3 to 6 mph after 0900.
                    Upper slopes to ridges: Northwest winds 3 to
                    6 mph in the morning becoming southeast
                    after 1100.

.SUNDAY NIGHT...

Sky/weather.........Clear in the evening. High clouds increasing
                    overnight.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....Valleys (below 3000 ft)...36-41.
                    Ridges  (above 6000 ft)...31-36.
Max humidity........Valleys (below 3000 ft)...88-95 percent.
                    Ridges  (above 6000 ft)...70-85 percent.
Wind (20 ft)........Valleys to midslopes: Downslope/Down-valley
                    winds 2 to 5 mph.
                    Upper slopes to ridges: Northwest winds 3 to
                    6 mph.

.MONDAY...

Sky/weather.........Mostly sunny.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....Valleys (below 3000 ft)...65-69.
                    Ridges  (above 5000 ft)...57-61.
Min humidity........Valleys (below 3000 ft)...27-32 percent.
                    Ridges  (above 5000 ft)...33-37 percent.
Wind (20 ft)........Valleys to midslopes: Downslope/Down-valley
                    winds 2 to 4 mph early in the morning becoming
                    upslope/up-valley 3 to 7 mph after 0900.
                    Except the Okanogan Valley south winds 6 to
                    9 mph after 1500.
                    Upper slopes to ridges: Northwest winds 3 to
                    6 mph in the morning becoming south-southeast
                    6 to 9 mph after 1100. Gusts up to 18 mph in
                    the afternoon.

$$
Forecaster...SVH
Requested by...April Miller
Type of request...WILDFIRE
.TAG 2622514.0/OTX
.DELDT 09/26/26
.FormatterVersion 2.0.0
.EMAIL christopher_miller@firenet.gov