688
FNUS75 KMSO 201330
FWSMSO
SPOT FORECAST FOR WILLIAMS CRK. FIRE
NATIONAL WEATHER SERVICE MISSOULA MT
730 AM MDT MON JUL 20 2026
FORECAST IS BASED ON FORECAST START TIME OF 0800 MDT ON JULY 20.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
A THERMAL TROUGH DEVELOPING IN EASTERN WASHINGTON,
WILL ENHANCE AN EASTERLY GRADIENT BY EVENING. WINDS WILL SLOWLY
TURN EASTERLY, WHEN THE OVERALL GRADIENT ALIGNS WITH THE DIURNAL
UPSLOPE COMPONENT THIS AFTERNOON THE POTENTIAL EXISTS FOR GUSTS
UP TO 12 MPH. THE EASTERLY COMPONENT WILL CONTINUE THROUGH THE
PERIOD.
POOR RH RECOVERIES CAN BE EXPECTED AGAIN TONIGHT AS THE REGION
REMAINS UNDER STRONG HIGH PRESSURE. MIN RHS INCREASE A FEW PERCENT
TUESDAY AS MONSOON MOISTURE MOVES NORTHWARD.
REST OF TODAY
* SKY/WEATHER.........PARTLY CLOUDY. PATCHY SMOKE DISPERSING AFTER
1500.
* CWR (> 0.10 INCH)...0 PERCENT.
* CHANCE LIGHTNING....0 PERCENT.
* MAX TEMPERATURE.....70-75.
* MIN HUMIDITY........21-26 PERCENT.
* WIND (20 FT)........VARIABLE 2-4 MPH BECOMING NORTHEAST 5-6 MPH
BRIEF GUSTS TO 12 MPH IN THE AFTERNOON.
* MIXING HEIGHT.......2500 FT AGL INCREASING TO 6000 FT AGL IN THE
AFTERNOON.
* MIXING WINDS........NORTHWEST 5 MPH.
* PRECIP AMOUNT.......0.00 INCHES.
TONIGHT
* SKY/WEATHER.........CLOUDY.
* CWR (> 0.10 INCH)...0 PERCENT.
* CHANCE LIGHTNING....0 PERCENT.
* MIN TEMPERATURE.....62-67.
* MAX HUMIDITY........38-43 PERCENT.
* WIND (20 FT)........NORTHEAST 5-6 MPH SHIFTING TO THE EAST 6-8
MPH OVERNIGHT.
* MIXING HEIGHT.......4000 FT AGL DECREASING TO 500 FT AGL EARLY IN
THE EVENING.
* MIXING WINDS........EAST 5 MPH.
* PRECIP AMOUNT.......0.00 INCHES.
TUESDAY
* SKY/WEATHER.........MOSTLY CLOUDY.
* CWR (> 0.10 INCH)...0 PERCENT.
* CHANCE LIGHTNING....0 PERCENT.
* MAX TEMPERATURE.....72-77.
* MIN HUMIDITY........23-28 PERCENT.
* WIND (20 FT)........EAST 5-7 MPH.
* MIXING HEIGHT.......3000 FT AGL INCREASING TO 8500 FT AGL.
* MIXING WINDS........EAST 10 MPH.
* PRECIP AMOUNT.......0.00 INCHES.
FORECASTER...BEC
REQUESTED BY...PETER JACOBSON
TYPE OF REQUEST...WILDFIRE
.TAG 2617324.6/MSO
.DELDT 07/20/26
.FORMATTERVERSION 2.0.0
.EMAIL PETER.A.JACOBSON@USDA.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page