844
FNUS75 KGJT 181209
FWSGJT

Spot Forecast for South Rim...NPS
National Weather Service Grand Junction CO
609 AM MDT Mon Aug 18 2025

Forecast is based on forecast start time of 0700 MDT on August 18.
If conditions become unrepresentative, contact the National Weather
Service.

.DISCUSSION...Afternoon RH values continue to fall over the next
couple of days as high pressure strengthens overhead. Temperatures
will warm to 5-10 degrees above normal for mid- August, but
lighter winds will prevent critical fire weather concerns. A few
afternoon gusts up to 20-25 mph can`t be ruled out.

.REST OF TODAY...

Sky/weather.........Sunny (5-15 percent).
CWR.................0 percent.
Max temperature.....81-86.
Min humidity........9-14 percent.
Wind (20 ft)........South winds 5-10 mph shifting to the west in
                    the afternoon.
Smoke dispersal.....Fair increasing to very good in the afternoon.
Mixing height.......11800 ft AGL.
Transport winds.....South 10 mph shifting to the west in the
                    afternoon.
Chance of thunder...0 percent.

.TONIGHT...

Sky/weather.........Mostly clear (5-15 percent).
CWR.................0 percent.
Min temperature.....52-57.
Max humidity........35-40 percent.
Wind (20 ft)........North winds 5-10 mph shifting to the southeast
                    overnight.
Smoke dispersal.....Good decreasing to poor (0 knot-ft) overnight.
Mixing height.......10200 ft AGL decreasing to 0 ft AGL overnight.
Transport winds.....Northwest 10 mph shifting to the east
                    overnight.
Chance of thunder...0 percent.

.TUESDAY...

Sky/weather.........Sunny (5-15 percent).
CWR.................0 percent.
Max temperature.....83-88.
Min humidity........5-10 percent.
Wind (20 ft)........Southeast winds 8-12 mph shifting to the
                    northwest in the afternoon.
Smoke dispersal.....Poor (23000 knot-ft) increasing to fair in the
                    afternoon.
Mixing height.......6500 ft AGL increasing to 11700 ft AGL in the
                    afternoon.
Transport winds.....Southeast 10 mph shifting to the northwest in
                    the afternoon.
Chance of thunder...5 percent.

$$
Forecaster...Kathryn Abbott
Requested by...Montana Masden
Type of request...WILDFIRE
.TAG 2519976.2/GJT
.DELDT 08/18/25
.FormatterVersion 2.0.0
.EMAIL Montana.Masden@usda.gov