158
FNUS75 KBYZ 220209
FWSBYZ

Spot Forecast for First Creek...BLM
National Weather Service Billings MT
809 PM MDT Mon Jul 21 2025

Forecast is based on forecast start time of 2000 MDT on July 21.
If conditions become unrepresentative...contact the National Weather
Service.

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

.DISCUSSION...

The fire site will continue to see light showers in its vicinity
through 9PM, with less than 5% of a wetting rain from them. A
light low-level jet picks up tonight as the showers dissipate.
There is a very small chance for rain showers to impact the
site late tomorrow morning.

Another round of storms are expected tomorrow afternoon, with the
likeliest time between 4 and 7 PM. Gusts up to 65 mph is the main
threat, with quarter-size hail and localized heavy rain also possible.


.TONIGHT...

Sky/weather.........Mostly cloudy then becoming partly cloudy.
                    Small chance of showers and thunderstorms early in
                    the evening.
CWR.................5 percent.
Chance of lightning.45 percent.
Min temperature.....62-66.
Max humidity........85-90 percent.
Wind (20 ft)........
 Slope/valley.......Northeast winds 10 to 12 mph, becoming east 6 to 8 mph after midnight.
Gusty and erratic winds expected near thunderstorms.
 Ridgetop...........Southeast winds 16 to 20 mph, gusting to 30 mph.
Mixing height.......1400 ft AGL early in the evening decreasing to
                    500 ft AGL overnight.
Transport winds.....Southeast winds 16 to 20 mph.

.TUESDAY...

Sky/weather.........Partly sunny then becoming sunny. Slight chance
                    of showers and thunderstorms in the afternoon.
CWR.................10 percent.
Chance of lightning.15 percent.
Max temperature.....82-86.
Min humidity........35-40 percent.
Wind (20 ft)........
 Slope/valley.......North winds 6 to 10 mph. Gusty and erratic winds
                    expected near thunderstorms in the afternoon.
 Ridgetop...........Northwest winds 10 to 15 mph.
Mixing height.......500 ft AGL early in the morning increasing to
                    5700 ft AGL in the afternoon.
Transport winds.....Northwest winds 10 to 15 mph.

.TUESDAY NIGHT...

Sky/weather.........Mostly cloudy. Showers in the evening. Chance
                    of thunderstorms and showers through the night.
CWR.................80 percent.
Chance of lightning.50 percent.
Min temperature.....60-64.
Max humidity........90-94 percent.
Wind (20 ft)........
 Slope/valley.......North winds 10 to 15 mph, becoming northwest
6 to 8 mph after midnight. Gusty and erratic winds
                    expected near thunderstorms.
 Ridgetop...........Northeast winds 11 to 16 mph.
Mixing height.......3800 ft AGL early in the evening decreasing to
                    600 ft AGL overnight.
Transport winds.....Northeast winds 10 to 15 mph.

$$
Forecaster...Vertz
Requested by...Brett Steffen
Type of request...WILDFIRE
.TAG 2518394.0/BYZ
.DELDT 07/21/25
.FormatterVersion 2.0.0
.EMAIL Mtmcc@firenet.gov