586
FNUS76 KOTX 272110
FWSOTX

Spot Forecast for Sinlahekin...USFS
National Weather Service Spokane WA
210 PM PDT Sun Sep 27 2026

Forecast is based on forecast start time of 0600 PDT on September 28.

.DISCUSSION...

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 and a chance
for rain on Tuesday.  Southwest winds will also be on the increase with
gusts up to 35 MPH on Tuesday with strongest winds on upper slopes
and ridgetops.

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

.MONDAY...

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 mid-slopes: 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 southwest 5 to 10
                    mph after 1100.

.MONDAY NIGHT...

Sky/weather.........Mostly cloudy.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....Valleys (below 3000 ft)...43-48.
                    Ridges  (above 5000 ft)...37-42.
Max humidity........75-90 percent.
Wind (20 ft)........Southwest 5 to 13 mph. Gusts up to 25 mph
                    overnight on upper slopes and ridgetops.

.TUESDAY...

Sky/weather.........Mostly cloudy. Chance of rain.
CWR.................15 percent.
Chance of lightning.0 percent.
Max temperature.....Valleys (below 3000 ft)...58-62.
                    Ridges  (above 5000 ft)...48-53.
Min humidity........50-65 percent.
Wind (20 ft)........Southwest winds 8 to 15 mph with gusts up
                    to 35 mph.  Strongest winds on upper slopes
                    and ridgetops.

$$
Forecaster...JW
Requested by...April Miller
Type of request...WILDFIRE
.TAG 2622514.1/OTX
.DELDT 09/27/26
.FormatterVersion 2.0.0
.EMAIL christopher_miller@firenet.gov