627
FNUS75 KMSO 172057
FWSMSO
SPOT FORECAST FOR RANSOME IAP
NATIONAL WEATHER SERVICE MISSOULA MT
257 PM MDT WED SEP 17 2025
FORECAST IS BASED ON FORECAST START TIME OF 0600 MDT ON SEPTEMBER 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
WARMER THAN NORMAL AND DRY THROUGH THE NEXT COUPLE
OF DAYS. OVERNIGHT THERMAL BELTS WITH TOP OF VALLEY INVERSION NEAR
5000 FT MSL LEADING TO WEAK RECOVERY OF TEMPS AND RH. WINDS
GENERALLY OUT OF THE SOUTH/UPSLOPE THURSDAY AFTERNOON. INCREASING
LIKELIHOOD FOR SOUTHWESTERLY WINDS BY FRIDAY AND INTO THE
WEEKEND. OVERNIGHT WINDS LIKELY TERRAIN DRIVEN MIDSLOPE AND OUT OF
THE SOUTHWEST AT RIDGE/PEAK TOPS.
THURSDAY
* SKY/WEATHER.........MOSTLY SUNNY.
* CWR (> 0.10 INCH)...0 PERCENT.
* CHANCE LIGHTNING....0 PERCENT.
* MAX TEMPERATURE.....73-78.
* MIN HUMIDITY........25-30 PERCENT.
* WIND (20 FT)........VARIABLE/DOWNSLOPE 1-3 MPH IN THE MORNING
BECOMING SOUTH/UPSLOPE 2-5 WITH GUSTS UP TO 10 MPH IN THE
MORNING.
* MIXING HEIGHT.......LESS THAN 500 FT AGL IN THE MORNING
INCREASING TO 6000 FT AGL IN THE AFTERNOON.
* MIXING WINDS........WEST-SOUTHWEST 5 MPH.
* PRECIP AMOUNT.......0.00 INCHES.
THURSDAY NIGHT
* SKY/WEATHER.........MOSTLY CLEAR.
* CWR (> 0.10 INCH)...0 PERCENT.
* CHANCE LIGHTNING....0 PERCENT.
* MIN TEMPERATURE.....51-56.
* MAX HUMIDITY........50-55 PERCENT.
* WIND (20 FT)........VARIABLE/DOWNSLOPE 1-4 MPH OVERNIGHT.
* MIXING HEIGHT.......DECREASING TO LESS THAN 100 FT AGL
OVERNIGHT.
* MIXING WINDS........WEST-SOUTHWEST 5 MPH.
* PRECIP AMOUNT.......0.00 INCHES.
FRIDAY
* SKY/WEATHER.........MOSTLY SUNNY.
* CWR (> 0.10 INCH)...0 PERCENT.
* CHANCE LIGHTNING....0 PERCENT.
* MAX TEMPERATURE.....73-78.
* MIN HUMIDITY........26-31 PERCENT.
* WIND (20 FT)........SOUTHWEST 2-5 MPH WITH GUSTS UP TO 12 MPH IN
THE AFTERNOON.
* MIXING HEIGHT.......INCREASING TO 7500 FT AGL.
* MIXING WINDS........SOUTHWEST 10 MPH.
* PRECIP AMOUNT.......0.00 INCHES.
FORECASTER...PARKER/KITSMILLER
REQUESTED BY...ALIX CHRISTMAN
TYPE OF REQUEST...WILDFIRE
.TAG 2521517.9/MSO
.DELDT 09/17/25
.FORMATTERVERSION 2.0.0
.EMAIL ALIX.CHRISTMAN@USDA.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page