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000
FNUS75 KBYZ 230011
FWSBYZ

Spot Forecast for Bridger Foothills...US Forest Service
National Weather Service Billings MT
611 PM MDT Tue Sep 22 2020

Forecast is based on forecast start time of 1800 MDT on September 22.
If conditions become unrepresentative...contact the National Weather
Service.

Please contact our office if you have questions
or concerns with this forecast.

...FIRE WEATHER WATCH IN EFFECT FROM THURSDAY AFTERNOON THROUGH
THURSDAY EVENING...

.DISCUSSION...

Showers and thunderstorms will continue over the next few hours.
These showers and thunderstorms have produced brief rain and winds
up to 50 mph. A wetting rain is not expected and amounts will be
less than 0.05 inches. The chance of showers will diminish after
sunset. The biggest concern during this period is the front that
will move over the fire after 3 PM Thursday. Winds will increase
and shift to the northwest with gusts to 40 mph possible. Min RH
will increase behind the front on Friday. Until then, expect min
RH to drop into the low 20s for the next couple days. Carrothers

.TONIGHT...

Sky/weather.........Partly cloudy. Scattered showers and
                    thunderstorms in the evening. Patchy smoke in
                    the evening.
LAL.................2...1 to 8 strikes/15 min/cell.
Min temperature.....39-45.
Max humidity........60-64 percent.
Wind (20 ft)........
 Slope/valley.......Downslope/downvalley winds 3 to 8 mph. Gusty and erratic winds
                    expected near thunderstorms in the evening.
 Ridgetop...........West winds 10 to 15 mph.
Mixing height.......200 ft AGL.
Transport winds.....Southwest winds 5 to 10 mph.
CWR.................0 percent.

.WEDNESDAY...

Sky/weather.........Mostly sunny.
LAL.................1...no thunderstorms.
Max temperature.....67-72.
Min humidity........21-26 percent.
Wind (20 ft)........
 Slope/valley.......Upslope/upvalley winds 5 to 10 mph after sunrise.
 Ridgetop...........West winds 15 to 20 mph.
Mixing height.......7700 ft AGL.
Transport winds.....Southwest winds 10 to 15 mph.
Haines index........2 or very low potential for large plume
                    dominated fire growth.
CWR.................0 percent.

.WEDNESDAY NIGHT...

Sky/weather.........Partly cloudy.
LAL.................1...no thunderstorms.
Min temperature.....45-50.
Max humidity........33-37 percent.
Wind (20 ft)........
 Slope/valley.......Downslope/downvalley winds 5 to 10 mph after sunset.
 Ridgetop...........West winds 25 to 30 mph.
Mixing height.......200 ft AGL.
Transport winds.....Southwest winds 5 to 10 mph.
CWR.................0 percent.

.THURSDAY...

Sky/weather.........Mostly sunny.
LAL.................1...no thunderstorms.
Max temperature.....67-72.
Min humidity........21-26 percent.
Wind (20 ft)........
 Slope/valley.......Upslope/upvalley winds 10 to 15 mph shifting to
northwest winds 20 to 25 mph after 3 PM. Winds will
gust to 40 mph behind the front.
 Ridgetop...........West winds 40 to 45 mph.
Mixing height.......8100 ft AGL.
Transport winds.....West winds 20 to 25  mph.
Haines index........3 or very low potential for large plume
                    dominated fire growth.
CWR.................0 percent.

$$
Forecaster...Arthur/Carrothers
Requested by...NICHOLAS NELSON
Type of request...WILDFIRE
.TAG 2012889.0/BYZ
.DELDT 09/22/20
.FormatterVersion 1.0.26
.EMAIL nicholas.nelson@usda.gov