432  
FNUS75 KBYZ 101531  
FWSBYZ  
 
SPOT FORECAST FOR CRATER RIDGE...USFS  
NATIONAL WEATHER SERVICE BILLINGS MT  
931 AM MDT SUN OCT 10 2021  
 
FORECAST IS BASED ON FORECAST START TIME OF 1000 MDT ON OCTOBER 10.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS  
OR CONCERNS WITH THIS FORECAST.  
   
..WINTER STORM WATCH MONDAY THROUGH WEDNESDAY
 
 
   
DISCUSSION
 
 
TODAY IS A BREAK BETWEEN WEATHER SYSTEMS WITH A POWERFUL FALL  
STORM IMPACTING THE BIGHORNS EARLY THIS WEEK. EXPECT INCREASING  
CLOUDS THIS AFTERNOON WHICH WILL CAP WARMING IN THE MID 40S AND  
HUMIDITY MINIMUMS AROUND 50 PERCENT. SCATTERED SHOWERS ARRIVE  
TONIGHT CHANGING TO SNOW AND BECOMING STEADY SNOW MONDAY. SNOW  
WILL BE HEAVY AT TIMES MONDAY NIGHT INTO TUESDAY. SNOWFALL AMOUNTS  
OF 8 TO 14 INCHES OF SNOW SHOULD BE EXPECTED WITH VERY STRONG  
WINDS CREATING WHITEOUT CONDITIONS MONDAY NIGHT THROUGH WEDNESDAY.  
MOISTURE AMOUNTS WILL BE CLOSE TO AN 1.5 INCHES. THE GUIDANCE  
DOES INDICATE SOME AMOUNTS CLOSER TO 24 INCHES OF SNOW IS POSSIBLE.  
DRYING AND WARMING IS EXPECTED THURSDAY INTO THE WEEKEND.  
   
REST OF TODAY
 
 
SKY/WEATHER.........INCREASING CLOUDS.  
CWR.................0 PERCENT.  
LAL.................1...NO THUNDERSTORMS.  
MAX TEMPERATURE.....46-50.  
MIN HUMIDITY........48-52 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......WEST WINDS 9 TO 14 MPH.  
RIDGETOP...........NORTHWEST AROUND 25 MPH.  
MIXING HEIGHT.......3200 FT AGL.  
TRANSPORT WINDS.....WEST AROUND 12 MPH.  
HAINES INDEX........2.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN SHOWERS  
AND SNOW SHOWERS IN THE EVENING, THEN SNOW  
SHOWERS AND RAIN SHOWERS OVERNIGHT. PATCHY FOG  
OVERNIGHT.  
CWR.................60 PERCENT.  
LAL.................1...NO THUNDERSTORMS.  
MIN TEMPERATURE.....25-29.  
MAX HUMIDITY........91-95 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......WEST WINDS 7 TO 8 MPH SHIFTING TO THE NORTHEAST  
7 TO 10 MPH OVERNIGHT.  
RIDGETOP...........WEST AROUND 5 MPH.  
MIXING HEIGHT.......800 FT AGL.  
TRANSPORT WINDS.....NORTHWEST AROUND 12 MPH.  
   
COLUMBUS DAY
 
 
SKY/WEATHER.........SNOW.  
CWR.................90 PERCENT.  
LAL.................1...NO THUNDERSTORMS.  
MAX TEMPERATURE.....26-30.  
MIN HUMIDITY........80-85 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......NORTHEAST WINDS 9 TO 10 MPH.  
RIDGETOP...........SOUTH AROUND 25 MPH.  
MIXING HEIGHT.......1600 FT AGL.  
TRANSPORT WINDS.....NORTHEAST AROUND 13 MPH.  
HAINES INDEX........2.  
   
FORECAST DAYS 3 THROUGH 5
 
   
TUESDAY
 
 
SNOW. PATCHY BLOWING SNOW. LOWS AROUND 20. HIGHS IN THE  
LOWER 20S. NORTHEAST WINDS AROUND 15 MPH.    
WEDNESDAY
 
 
MOSTLY CLOUDY WITH SNOW SHOWERS. LOWS AROUND 20. HIGHS IN  
THE MID 20S. NORTHWEST WINDS AROUND 12 MPH.    
THURSDAY
 
 
MOSTLY CLOUDY. SLIGHT CHANCE OF SNOW SHOWERS. LOWS IN THE LOWER  
20S. HIGHS IN THE UPPER 20S. WEST WINDS AROUND 11 MPH.  
 

 
FORECASTER...BORSUM  
REQUESTED BY...TRAVIS BRATEN  
TYPE OF REQUEST...WILDFIRE  
.TAG 2118262.26/BYZ  
.DELDT 10/10/21  
.FORMATTERVERSION 2.0.0  
.EMAIL PBLAIR@BLM.GOV,JUSTIN.HUMRICHOUSE@USDA.GOV  
 
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