520
FNUS75 KBYZ 052354
FWSBYZ

Spot Forecast for West Fork...USFS
National Weather Service Billings MT
554 PM MDT Fri Sep 5 2025

Forecast is based on forecast start time of 1800 MDT on September 05.
If conditions become unrepresentative...contact the National Weather
Service.

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

.DISCUSSION...

Conditions will remain dry with mostly light winds into Saturday.
Areas of smoke will move in again Saturday morning and may reduce
surface visibility below 6 miles at times. The smoke is expected to
move out again late Saturday evening. Late Saturday night into Sunday
morning, there is a 10% chance of a shower or weak thunderstorm. The
chance increases through the day Sunday, with the highest chance
(30-40% chance showers or storms, 20% CWR) Sunday evening. The main
threat with any showers or storms will be erratic gusts of 30-40 mph.

For the first half of next week, Monday looks to be the driest day,
with minimum humidities in the upper 20s and a less than 20% chance
of any showers or weak storms. Tuesday and Wednesday currently have
a 40% chance showers, a 20% chance of thunderstorms, and a 20% CWR
each day. The best chance will be in the afternoon and evening hours,
but a low chance of showers will remain possible during the overnight
and morning hours.

.TONIGHT...

Sky/weather.........Mostly clear. Haze overnight.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....36-40.
Max humidity........46-50 percent.
Wind (20 ft)........
 Slope/valley.......North winds 5 to 8 mph in the evening becoming
                    light.
 Ridgetop...........North around 10 mph.
Mixing height.......5100 ft AGL early in the evening decreasing to
                    700 ft AGL overnight.
Transport winds.....North around 10 mph.

.SATURDAY...

Sky/weather.........Sunny becoming mostly cloudy in the evening.
                    Areas of smoke through the day.
CWR.................0 percent.
Chance of lightning.2 percent.
Max temperature.....68-72.
Min humidity........20-24 percent.
Wind (20 ft)........
 Slope/valley.......Light winds becoming north 5 to 8 mph in the
                    afternoon.
 Ridgetop...........Northwest around 10 mph.
Mixing height.......700 ft AGL early in the morning increasing to
                    10300 ft AGL in the afternoon.
Transport winds.....Northwest around 10 mph.

.SATURDAY NIGHT...

Sky/weather.........Mostly cloudy. Areas of smoke.
CWR.................Less than 5 percent.
Chance of lightning.9 percent.
Min temperature.....41-45.
Max humidity........82-86 percent.
Wind (20 ft)........
 Slope/valley.......South winds 5 to 8 mph.
 Ridgetop...........Southwest around 10 mph.
Mixing height.......8900 ft AGL early in the evening decreasing to
                    500 ft AGL overnight.
Transport winds.....Southwest around 10 mph.

.SUNDAY...

Sky/weather.........Partly sunny. Slight chance of rain showers in
                    the morning, then chance of showers and
                    thunderstorms in the afternoon.
CWR.................15 percent.
Chance of lightning.30 percent.
Max temperature.....66-70.
Min humidity........36-40 percent.
Wind (20 ft)........
 Slope/valley.......South winds 5 to 10 mph. Gusts up to 20 mph
                    in the afternoon. Gusty and erratic winds
                    expected near thunderstorms.
 Ridgetop...........Southwest around 20 mph.
Mixing height.......600 ft AGL early in the morning increasing to
                    9600 ft AGL in the afternoon.
Transport winds.....Southwest around 15 mph.

.FORECAST DAYS 3 THROUGH 5...
.MONDAY...
Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the upper 30s. Highs in the mid 60s. South
winds around 10 mph.
.TUESDAY...
Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the lower 40s. Highs in the lower 60s.
South winds around 10 mph.
.WEDNESDAY...
Mostly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the upper 30s. Highs in the lower 60s.
South winds around 10 mph.

$$
Forecaster...Archer
Requested by...Vicki Stephens
Type of request...WILDFIRE
.TAG 2520413.16/BYZ
.DELDT 09/05/25
.FormatterVersion 2.0.0
.EMAIL vicki_stephens@firenet.gov