617
FNUS75 KBYZ 172333
FWSBYZ

Spot Forecast for Graham Creek...Billings Dispatch
National Weather Service Billings MT
533 PM MDT Sun Aug 17 2025

Forecast is based on forecast start time of 1700 MDT on August 17.
If conditions become unrepresentative...contact the National Weather
Service.

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

.DISCUSSION...

Currently, continuous scattered showers and thunderstorms are moving
over the fire. These showers and thunderstorms have about a 50% chance
of continuing through 2200 MDT. Gusty winds 30-40 mph and heavy rainfall
are the main concerns with these storms. Isolated showers look to
dissipate a little after midnight. Scattered showers and thunderstorms
are again expected to initiate over the Beartooth/Absarokas around
2000-2100 MDT Monday afternoon with gusty winds 30-40 mph possible.
TS

.REST OF TODAY...

Sky/weather.........Mostly cloudy. Showers likely and chance of
                    thunderstorms.
CWR.................35 percent.
Chance of lightning.44 percent.
Max temperature.....56-60.
Min humidity........48-52 percent.
Wind (20 ft)........
 Slope/valley.......Southwest winds 8 to 12 mph. Gusty and erratic winds
                    expected near thunderstorms.
 Ridgetop...........Southwest around 10 mph.
Mixing height.......1500 ft AGL.
Transport winds.....Southwest around 10 mph.

.TONIGHT...

Sky/weather.........Mostly cloudy then becoming partly cloudy. Rain
                    showers likely and chance of thunderstorms in
                    the evening.
CWR.................50 percent.
Chance of lightning.29 percent.
Min temperature.....46-50.
Max humidity........75-80 percent.
Wind (20 ft)........
 Slope/valley.......Southwest winds 5 to 8 mph. Gusty and erratic
                    winds expected near thunderstorms in the
                    evening.
 Ridgetop...........Southwest around 5 to 15 mph.
Mixing height.......Decreasing to 100 ft AGL overnight.
Transport winds.....Southwest around 12 mph.

.MONDAY...

Sky/weather.........Sunny then becoming partly sunny. Slight chance
                    of showers and thunderstorms in the afternoon.
CWR.................7 percent.
Chance of lightning.21 percent.
Max temperature.....67-71.
Min humidity........26-30 percent.
Wind (20 ft)........
 Slope/valley.......Southwest winds 5 to 8 mph. Gusty and erratic
                    winds expected near thunderstorms in the
                    afternoon.
 Ridgetop...........Southwest around 10 to 20 mph.
Mixing height.......8400 ft AGL in the afternoon.
Transport winds.....South transitioning west around 15 mph.

$$
Forecaster...Stetzer
Requested by...Jessica Westbrook
Type of request...WILDFIRE
.TAG 2520099.0/BYZ
.DELDT 08/17/25
.FormatterVersion 2.0.0
.EMAIL mtbdc@firenet.gov