015
FNUS75 KBYZ 182301
FWSBYZ

Spot Forecast for Valley...MTDNRC
National Weather Service Billings MT
501 PM MDT Tue Aug 18 2026

Forecast is based on forecast start time of 1700 MDT on August 18.
If conditions become unrepresentative...contact the National Weather
Service.

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

.DISCUSSION...
Showers and thunderstorms are currently moving across the fire
vicinity... and should move east of the fire by 530-545 pm.
Erratic gusts from 40-50 mph are possible...but it is more likely
to be in the 25 to 35 mph range.

Once the current activity moves through...there may be periods of
isolated shower and thundershowers the rest of the evening. Gusts
35 to 45 mph with these showers remains a possibility. The threat of
showers/lightning should end by 11 pm. RH recoveries overnight will
be good.

Wednesday looks warm and dry. West winds will prevail under 15 mph.
BT


.REST OF TODAY...

Sky/weather.........Partly sunny. Slight chance of showers and
                    thunderstorms.
CWR.................35 percent.
Chance of lightning.75 percent.
Max temperature.....84-88.
Min humidity........26-30 percent.
Wind (20 ft)........
 Slope/valley.......Light winds. Gusty and erratic winds expected
                    near thunderstorms.
 Ridgetop...........West around 20 mph.
Mixing height.......8500 ft AGL.
Transport winds.....Northwest around 8 mph.

.TONIGHT...

Sky/weather.........Mostly cloudy then becoming partly cloudy.
                    Chance of showers and slight chance of
                    thunderstorms in the evening, then slight
                    chance of showers overnight.
CWR.................6 percent.
Chance of lightning.23 percent.
Min temperature.....57-63.
Max humidity........72-76 percent.
Wind (20 ft)........
 Slope/valley.......Light winds. Gusty and erratic winds expected
                    near thunderstorms in the evening.
 Ridgetop...........Northwest around 15 mph.
Mixing height.......4700 ft AGL early in the evening decreasing to
                    400 ft AGL overnight.
Transport winds.....Southwest around 10 mph.

.WEDNESDAY...

Sky/weather.........Sunny. Patchy smoke in the afternoon.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....88-92.
Min humidity........18-22 percent.
Wind (20 ft)........
 Slope/valley.......West winds 5 to 9 mph.
 Ridgetop...........Northwest around 15 mph.
Mixing height.......400 ft AGL early in the morning increasing to
                    10000 ft AGL in the afternoon.
Transport winds.....West around 12 mph.

$$
Forecaster...Tesar
Requested by...Phillips
Type of request...WILDFIRE
.TAG 2619973.0/BYZ
.DELDT 08/18/26
.FormatterVersion 2.0.0
.EMAIL mtmcc@firenet.gov