170
FNUS75 KMSO 212230 RRA
FWSMSO
SPOT FORECAST FOR BUTTERFLY
NATIONAL WEATHER SERVICE MISSOULA MT
350 PM MDT FRI AUG 21 2026
FORECAST IS BASED ON FORECAST START TIME OF 0700 MDT ON AUGUST 22.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
SATURDAY
MOSTLY CLOUDY CONDITIONS ARE EXPECTED IN THE MORNING,
WITH A 20 PERCENT PROBABILITY FOR LIGHT RAIN SHOWERS BETWEEN
0400-0700. THESE SHOWERS WILL BE MORE LIKE SPRINKLES, NOT WETTING
RAINS. LIGHT SOUTHERLY WINDS IN THE MORNING WILL BECOME WESTERLY
5-9 MPH, WITH GUSTS AROUND 12-18 MPH IN THE AFTERNOON. DURING THE
AFTERNOON, THERE WILL BE A 25 PERCENT PROBABILITY FOR MOSTLY DRY
THUNDERSTORMS BETWEEN 1500 AND 2000. CHANCES FOR WETTING RAINS ARE
VERY LOW, UNLESS THE CORE OF THE THUNDERSTORMS ARE DIRECTLY
OVERHEAD. GUSTY AND ERRATIC WINDS AROUND 30 MPH ARE POSSIBLE WITH
THE THUNDERSTORMS. A DRY COLD FRONT WILL MOVE THROUGH THE AREA
SUNDAY, WITH THE FRONTAL PASSAGE LATE MORNING TO EARLY AFTERNOON
1000-1300, WITH GUSTS BETWEEN 25 AND 30 MPH FROM 1100 TO SUNSET.
* SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SHOWERS AND SLIGHT
CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* CWR (> 0.10 INCH)...LESS THAN 10 PERCENT.
* CHANCE LIGHTNING....25 PERCENT.
* MAX TEMPERATURE.....75-80.
* MIN HUMIDITY........30-35 PERCENT.
* WIND (20 FT)........SOUTH 2-4 MPH BECOMING WEST AROUND 5-9 MPH
IN THE AFTERNOON, GUSTS 12-18 MPH.
* MIXING HEIGHT.......2500 FT AGL INCREASING TO 8000 FT AGL.
* MIXING WINDS........SOUTHWEST 10 MPH.
* PRECIP AMOUNT.......0.01 INCHES.
SATURDAY NIGHT
* SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS AND
SLIGHT CHANCE OF THUNDERSTORMS IN THE EVENING.
* CWR (> 0.10 INCH)...20 PERCENT.
* CHANCE LIGHTNING....25 PERCENT.
* MIN TEMPERATURE.....55-60.
* MAX HUMIDITY........63-68 PERCENT.
* WIND (20 FT)........SOUTHEAST AROUND 5 MPH.
* MIXING HEIGHT.......500 FT AGL.
* MIXING WINDS........SOUTH 10 MPH.
* PRECIP AMOUNT.......0.04 INCHES.
SUNDAY
* SKY/WEATHER.........PARTLY CLOUDY. SLIGHT CHANCE OF RAIN IN THE
AFTERNOON.
* CWR (> 0.10 INCH)...LESS THAN 10 PERCENT.
* CHANCE LIGHTNING....UP TO 10 PERCENT.
* MAX TEMPERATURE.....68-73.
* MIN HUMIDITY........31-36 PERCENT.
* WIND (20 FT)........VARIABLE 2-5 MPH BECOMING WEST 5-9 MPH WITH
GUSTS TO AROUND 25-30 MPH IN THE AFTERNOON.
* MIXING HEIGHT.......2500 FT AGL INCREASING TO 8500 FT AGL.
* MIXING WINDS........SOUTHWEST 10 MPH.
* PRECIP AMOUNT.......0.00 INCHES.
FORECASTER...ROBINSON
REQUESTED BY...CLINT MENDENHALL
TYPE OF REQUEST...WILDFIRE
.TAG 2618902.20/MSO
.DELDT 08/21/26
.FORMATTERVERSION 2.0.0
.EMAIL CHRIS.MARABETTA@USDA.GOV,CLINT.MENDENHALL@USDA.GOV,CHRISTOPHER.M.KRAMER@USDA.GOV,2026.NORTHFORKLOSTHORSE.PLANS@FIRENET.GOV,JACQUIE_PARKS@FIRENET.GOV
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