318
FNUS76 KOTX 190904
FWSOTX

Spot Forecast for Upper Smith...USFS
National Weather Service Spokane WA
204 AM PDT Sat Sep 19 2026

Forecast is based on forecast start time of 0600 PDT on September 19.
.DISCUSSION...

Conditions will be dry with mild temperatures through the period.
RH recovery tonight will be fair. Sunday trends a few degrees
warmer with similar relative humidity values. Winds will be largely
diurnally and terrain drive. Some breezy conditions are expected
early today near the ridgetops and they increase again slightly
this evening with a weak wave passing to the north. Winds Sunday
are forecast to be lighter.

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

.TODAY...

Sky/weather.........Mostly sunny.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....Mid Slopes to Ridgetops..........55-63
                    Valley Bottom and Lower Slopes...64-74
Min humidity........Mid Slopes to Ridgetops..........40-46 percent.
                    Valley Bottom and Lower Slopes...34-39 percent.
Wind (20 ft)........Valleys/Mid Slopes: Upslope/Upvalley winds 2 to
                    5 mph.
                    Ridgetops: South-Southeast Winds 7 to 15 mph
                    before 1000...decreasing to 4 to 7 mph.
Mixing height.......4500 ft AGL in the afternoon.
Transport winds.....Light winds becoming south around 5 mph in the
                    afternoon.
Ventilation Index...Moderate (208).

.TONIGHT...

Sky/weather.........Partly cloudy.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....Mid Slopes to Ridgetops..........42-45
                    Valley Bottom and Lower Slopes...46-51
Max humidity........63-71 percent.
Wind (20 ft)........Southwest winds 6 to 12 mph with gusts to
                    17 mph on the Ridgetops through evening...
                    becoming downslope/downvalley 3 to 7 mph.
Mixing height.......1000 ft AGL.
Transport winds.....Southwest around 6 mph in the evening becoming
                    light.
Ventilation Index...Low (49).

.SUNDAY...

Sky/weather.........Mostly sunny.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....Mid Slopes to Ridgetops..........62-68
                    Valley Bottom and Lower Slopes...69-78
Min humidity........Mid Slopes to Ridgetops..........40-45 percent.
                    Valley Bottom and Lower Slopes...34-39 percent.
Wind (20 ft)........Downslope/downvalley 3 to 7 mph in the morning...
                    becoming upslope/valley 3 to 7 mph in the afternoon.
Mixing height.......4500 ft AGL in the afternoon.
Transport winds.....Southwest 5 to 7 mph.
Ventilation Index...Moderate (286).

$$
Forecaster...MSC
Requested by...Incident Commander
Type of request...WILDFIRE
.TAG 2621955.3/OTX
.DELDT 09/19/26
.FormatterVersion 2.0.0
.EMAIL jesse.countryman@usda.gov