486
FNUS75 KBYZ 040007
FWSBYZ

Spot Forecast for West Fork...USFS
National Weather Service Billings MT
607 PM MDT Wed Sep 3 2025

Forecast is based on forecast start time of 1800 MDT on September 03.
If conditions become unrepresentative...contact the National Weather
Service.

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

.DISCUSSION...

Terrain driven winds will prevail tonight with only modest RH
recoveries in the mid 40s percent. On Thursday, a dry cold front
passage around 0900 to 1200 MDT will bring breezy northerly winds
with gusts up to 20 mph and increased wildfire smoke to the fire
site. With this, surface visibility could drop below 6 miles
during the morning and afternoon, potentially impacting aircraft
in the area. Thursday night will see cool temperatures in the 30s
and strong RH recoveries in the 80s to 90s percent as winds
becoming terrain driven once again. Friday will be a dry post-
frontal day with lighter northerly winds around 10 mph. Look for
the chance of precipitation to return to the fire site this
weekend as seasonal temperatures prevail. Arends

.TONIGHT...

Sky/weather.........Mostly clear. Areas of smoke.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....46-50.
Max humidity........43-47 percent.
Wind (20 ft)........
 Slope/valley.......Northwest 6 to 10 mph early in the evening becoming
                    down-slope/down-valley around 5 to 8 mph after
                    2000 MDT.
 Ridgetop...........North around 10 to 20 mph.
Mixing height.......Decreasing to 600 ft AGL overnight.
Transport winds.....North around 10 to 20 mph.

.THURSDAY...

Sky/weather.........Sunny. Areas of smoke.
CWR.................0 percent.
Chance of lightning.2 percent.
Max temperature.....64-68.
Min humidity........29-33 percent.
Wind (20 ft)........
 Slope/valley.......North 9 to 12 mph with gusts up to 20 mph behind
                    the morning cold front passage.
 Ridgetop...........North around 10 to 20 mph.
Mixing height.......Increasing to 7500 ft AGL in the afternoon.
Transport winds.....North around 10 to 20 mph.

.THURSDAY NIGHT...

Sky/weather.........Partly cloudy. Areas of smoke.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....34-38.
Max humidity........88-92 percent.
Wind (20 ft)........
 Slope/valley.......North around 10 mph with gusts up to 18 mph in the
                    evening becoming down-slope/down-valley around
                    5 to 8 mph after 2100 MDT.
 Ridgetop...........North around 10 to 15 mph.
Mixing height.......Decreasing to 600 ft AGL overnight.
Transport winds.....North around 10 to 15 mph.

.FRIDAY...

Sky/weather.........Sunny.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....62-66.
Min humidity........26-30 percent.
Wind (20 ft)........
 Slope/valley.......North around 10 mph.
 Ridgetop...........North around 10 to 15 mph.
Mixing height.......Increasing to 6800 ft AGL in the afternoon.
Transport winds.....North around 10 to 15 mph.

.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...
Mostly clear. Lows in the upper 30s. Highs in the upper 60s.
Northeast winds around 5 mph.
.SUNDAY...
Mostly cloudy. Chance of showers and thunderstorms. Lows in the
lower 40s. Highs in the mid 60s. South winds around 6 mph.
.MONDAY...
Mostly cloudy. Chance of showers and slight chance of
thunderstorms. Lows around 40. Highs in the lower 60s. South
winds around 6 mph.

$$
Forecaster...Arends
Requested by...Vicki Stephens
Type of request...WILDFIRE
.TAG 2520413.14/BYZ
.DELDT 09/03/25
.FormatterVersion 2.0.0
.EMAIL vicki_stephens@firenet.gov