120
FNUS75 KGJT 212159
FWSGJT

Spot Forecast for Slough Canyon...UTUBC
National Weather Service Grand Junction CO
359 PM MDT Fri Aug 21 2026

Forecast is based on forecast start time of 1600 MDT on August 21.
If conditions become unrepresentative, contact the National Weather
Service.

.DISCUSSION...

Thunderstorms are unlikely to occur directly over the Slough
Canyon Fire today, but nearby thunderstorms could produce impacts
such as lightning within 10 miles of the fire and strong outflow
winds potentially greater than 35 mph. Thunderstorms are more
likely at the forecast site tomorrow, but chances are still low
(less than 15 percent). It is more likely storms occur over the
nearby high terrain. Periods of heavy rainfall is possible with
any storms that move over the fire.

.REST OF TODAY...

Sky/weather.........Mostly sunny (40-50 percent).
CWR.................0 percent.
Max temperature.....87-92.
Min humidity........14-19 percent.
Wind (20 ft)........East winds 10 mph. Gusts up to 15 mph.
Smoke dispersal.....Good.
Mixing height.......10100 ft AGL.
Transport winds.....Southeast 10 mph.
Clearing Index......800.
Chance of thunder...10 percent.

.TONIGHT...

Sky/weather.........Mostly cloudy (50-60 percent).
CWR.................0 percent.
Min temperature.....64-69.
Max humidity........40-45 percent.
Wind (20 ft)........East winds 5 to 10 mph. Gusty and erratic
winds expected near thunderstorms.
Smoke dispersal.....Good decreasing to poor (3000 knot-ft)
                    overnight.
Mixing height.......9500 ft AGL decreasing to 600 ft AGL overnight.
Transport winds.....Southeast 10 mph.
Clearing Index......670 decreasing to 50 overnight.
Chance of thunder...10 percent.

.SATURDAY...

Sky/weather.........Mostly sunny (25-35 percent). Slight chance of
                    showers and thunderstorms through the day.
CWR.................10 percent.
Max temperature.....82-87.
Min humidity........21-26 percent.
Wind (20 ft)........South winds 10 mph shifting to the southwest 10
                    to 15 mph in the afternoon. Gusts up to 20 mph.
Gusty and erratic winds expected near
thunderstorms.
Smoke dispersal.....Fair increasing to good by noon then increasing
to very good in the midafternoon.
Mixing height.......5400 ft AGL increasing to 9400 ft AGL by peak
                    heating.
Transport winds.....South 10 mph.
Clearing Index......430 increasing to 1050 in the afternoon.
Chance of thunder...15 percent.

$$
Forecaster...Gillian Felton
Requested by...H Phillipson
Type of request...WILDFIRE
.TAG 2619987.5/GJT
.DELDT 08/21/26
.FormatterVersion 2.0.0
.EMAIL tmaine@blm.gov,utubc@firenet.gov