042  
FXUS65 KBYZ 210859  
AFDBYZ  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BILLINGS MT  
259 AM MDT THU OCT 21 2021  
   
DISCUSSION
 
 
TODAY THROUGH FRIDAY NIGHT...  
 
A WEAK SHORTWAVE LIFTING NORTH AND EAST INTO SOUTHERN CANADA MAY  
BRING A FEW ISOLATED SHOWERS TO WESTERN AREAS THIS MORNING.  
OTHERWISE, EXPECT HIGH PRESSURE TO BUILD INTO THE REGION AND  
DOMINATE OVER THE AREA THROUGH FRIDAY. MAINLY DRY CONDITIONS CAN  
BE EXPECTED WITH HIGH TEMPERATURES IN THE 60S TO LOWER 70S MOST  
LOCATIONS TODAY AND FRIDAY. LOW TEMPERATURES IN THE 30S TO LOWER  
40S ARE FORECAST TONIGHT AND FRIDAY NIGHT. STP  
 
SATURDAY THROUGH THURSDAY...  
 
HIGH PRESSURE WILL BE IN PLACE OVER THE AREA ON SATURDAY, BEFORE  
THE FIRST IN A SERIES OF SHORTWAVES BEGINS TO MOVE INTO THE  
REGION BY SUNDAY. ENSEMBLES ARE GENERALLY IN GOOD AGREEMENT OF A  
DEEP UPPER TROUGH MOVING INTO THE WEST SUNDAY INTO MONDAY, WITH  
ASSOCIATED SHORTWAVES MOVING INTO THE REGION IN SOUTHWEST FLOW. AS  
A RESULT, PRECIPITATION CHANCES WILL INCREASE OVER WESTERN AREAS,  
BUT ESPECIALLY THE SOUTHWEST MOUNTAINS. SOME SNOW ACCUMULATIONS  
ARE POSSIBLE, ESPECIALLY ON SOUTH AND WEST FACING ASPECTS. THERE  
IS ALSO POTENTIAL FOR INCREASING WIND ALONG THE WESTERN FOOTHILLS  
IN THE TUESDAY-WEDNESDAY TIMEFRAME, BEFORE HIGH PRESSURE BEGINS TO  
BUILD BACK OVER THE REGION ON THURSDAY.  
 
HIGH TEMPERATURES ARE FORECAST TO RANGE FROM THE UPPER 50S TO 60S  
MOST DAYS, WITH LOW TEMPERATURES IN THE 30S TO LOWER 40S. STP  
 

 
   
AVIATION
 
 
VFR CONDITIONS WILL PREVAIL AT ALL LOCATIONS THROUGH THE FORECAST  
PERIOD WITH PASSING MID AND HIGH CLOUDS. SURFACE WINDS MAY GUST  
OVER 20 KTS AT TIMES IN THE FOOTHILLS, BUT WILL OTHERWISE NOT POSE  
A SIGNIFICANT RISK FOR AVIATION CONCERNS. BT/STP  
 

 
   
PRELIMINARY POINT TEMP/POPS
 
 
TDY FRI SAT SUN MON TUE WED  
-------------------------------------------------------  
BIL 067 040/070 044/061 037/060 042/068 044/060 041/061  
0/B 00/U 01/B 21/B 01/B 43/R 11/N  
LVM 066 038/069 039/055 034/056 039/065 037/055 035/054  
0/N 00/U 23/R 22/R 24/R 54/R 33/R  
HDN 069 036/072 039/063 035/061 036/070 041/062 037/063  
0/B 00/U 01/B 21/B 01/B 33/R 11/B  
MLS 062 034/065 039/058 036/059 039/066 043/061 038/061  
0/B 00/U 11/B 11/B 00/B 22/R 11/N  
4BQ 064 036/067 038/061 037/059 039/070 046/061 038/061  
0/B 00/U 00/B 11/B 00/B 13/R 11/U  
BHK 058 033/063 036/054 034/057 036/063 043/060 036/059  
0/B 10/U 01/N 11/B 00/N 12/R 10/N  
SHR 065 034/069 037/062 032/058 034/069 039/060 033/061  
0/U 00/U 01/B 21/B 01/B 34/R 11/U  
 

 
   
BYZ WATCHES/WARNINGS/ADVISORIES
 
 
MT...NONE.  
WY...NONE.  
 

 
 

 
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