745
FNUS76 KOTX 311305
FWSOTX

Spot Forecast for Coulee City...BLM
National Weather Service Spokane WA
605 AM PDT Fri Jul 31 2026

Forecast is based on forecast start time of 0600 PDT on July 31.
...FIRE WEATHER WATCH IN EFFECT FROM SATURDAY MORNING THROUGH
SATURDAY EVENING...

.DISCUSSION...

Similarly dry conditions compared to Thursday at the fire
location, though temperatures will be hotter and winds not as
breezy. Poor RH recoveries are expected tonight. While minimum
humidities will be similar again on Saturday, very strong west to
southwest winds will ramp up through the day leading to extreme
fire behavior across the Waterville Plateau. Wind gusts up to 55
mph may also lead to areas of blowing dust around the fire
location which may further limit visibilities. Winds will
gradually decrease through Saturday night but remain very breezy
into Sunday.

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.........Sunny. Patchy smoke through the day.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....Around 90.
Min humidity........15-20 percent.
Wind (20 ft)........North winds 5 to 6 mph shifting to the south
                    by 1000 hours, then increase to 5 to 7 mph in
                    the afternoon. Winds will make a subtle
                    southwesterly shift after 1700 hours.
Mixing height.......3500 ft AGL increasing to 5500 ft AGL in the
                    afternoon.
Transport winds.....North around 6 mph shifting to the south around
                    8 mph in the afternoon.
Ventilation Index...Low (137) increasing to moderate (428) in the
                    afternoon.

.TONIGHT...

Sky/weather.........Mostly clear. Haze and patchy smoke.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....Around 66.
Max humidity........35-40 percent.
Wind (20 ft)........Southwest winds 5 to 7 mph shifting to the west-
                    northwest around 6 mph by 0100 hours. Northwest winds
                    then increase to 10 to 15 mph by 0600 hours.
Mixing height.......5000 ft AGL falling to 500 ft AGL.
Transport winds.....South around 7 mph shifting to the west around
                    9 mph overnight.
Ventilation Index...Moderate (342) decreasing to low (41)
                    overnight.

.SATURDAY...

Sky/weather.........Sunny. Areas of blowing dust in the afternoon.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....Around 84.
Min humidity........15-20 percent.
Wind (20 ft)........Sustained west to northwest winds 11 to 17 mph
                    with gusts up to 30 mph in the morning, increasing
                    to 25 to 30 mph with gusts up to 55 mph in the
                    afternoon.
Mixing height.......5500 ft AGL increasing to 8000 ft AGL in the
                    afternoon.
Transport winds.....West around 15 to 20 mph increasing to around 30
                    to 35 mph in the afternoon.
Ventilation Index...Very high (918) increasing to very high (1764)
                    in the afternoon.

$$
Forecaster...PP
Requested by...Brad Fredrickson
Type of request...WILDFIRE
.TAG 2618726.0/OTX
.DELDT 07/31/26
.FormatterVersion 2.0.0
.EMAIL bfredrickson@blm.gov,wacwc@firenet.gov