228  
FXUS65 KBYZ 261517  
AFDBYZ  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BILLINGS MT  
917 AM MDT THU APR 26 2018  
   
UPDATE
 
 
QUIET WEATHER IN STORE AS UPPER RIDGE BUILDS IN FROM THE WEST  
TODAY. WITH 500MB HEIGHTS CLIMBING INTO THE 570S AND 700MB TEMPS  
RISING TO ABOVE 0C, BELIEVE OUR WESTERN AREAS WILL SEE AFTERNOON  
TEMPS CLIMB A BIT HIGHER THAN THE MID 60S, SO HAVE BUMPED UP  
FORECAST HIGHS A BIT TO SHOW UPPER 60S TO AROUND 70F. OTHERWISE  
CLEAR SKIES AND LIGHTER WINDS TODAY. JKL  
 

 
   
SHORT TERM...VALID FOR TDY AND FRI
 
 
DRY AND MILD CONDITIONS WILL PREVAIL THE NEXT COUPLE OF DAYS AS  
A RIDGE SHIFTS OVER THE NORTHERN ROCKIES. EXPECT HIGHS MOSTLY IN  
THE 60S TOMORROW THEN LOW-MID 70S FRIDAY, PERHAPS A BIT COOLER IN  
THE FAR EAST AS WINDS TURN EASTERLY.  
 
HYDRO CONCERNS...WITH THE WARMER TEMPS WE EXPECT TO SEE A RISE IN  
RIVER LEVELS THE NEXT FEW DAYS. THE ONLY LOCATION IN THE SHORT  
TERM THAT IS EXPECTED TO COME NEAR FLOOD STAGE IS THE SHIELDS  
RIVER NEAR LIVINGSTON. OUR DAY SHIFTERS WILL LIKELY UPDATE THE  
HYDROLOGIC OUTLOOK AT SOME POINT TODAY. BT  
   
LONG TERM...VALID FOR SAT...SUN...MON...TUE...WED
 
 
EXTENDED MODELS ARE IN GOOD AGREEMENT IN SHOWING AN UNSETTLED  
PERIOD BEGINNING SUNDAY AND CONTINUING THROUGH THE MIDDLE OF NEXT  
WEEK. A LARGE UPPER LOW WILL BE OVER THE PACIFIC NORTHWEST  
SATURDAY ALLOWING FOR A SOUTH/SOUTHWEST FLOW ALOFT ACROSS OUR  
FORECAST AREA. 850MB TEMPERATURES RISE INTO THE LOWER 20SC  
RESULTING IN SATURDAY BEING THE WARMEST DAY IN THE EXTENDED WITH  
MANY AREAS AROUND 80 DEGREES.  
 
A COLD FRONT MOVES ACROSS THE FORECAST AREA SUNDAY BRINGING A  
CHANCE FOR SHOWERS AND THUNDERSTORMS. COMPRESSIONAL WARMING AHEAD  
OF THE FRONT WILL ALLOW FOR ANOTHER ABOVE NORMAL DAY, ALTHOUGH NOT  
AS WARM AS SATURDAY. THE UPPER LOW SLOWLY MOVES EAST ACROSS THE  
NORTHERN ROCKIES SUNDAY AND MONDAY BRINGING INCREASING CHANCES FOR  
SHOWERS AND THUNDERSTORMS ALONG WITH COOLER TEMPERATURES.  
 
SEVERAL DISTURBANCES WITHIN A NORTHERLY FLOW ALOFT WILL MOVE  
SOUTH OUT OF CANADA TUESDAY NIGHT THROUGH THURSDAY. THIS WILL  
RESULT IN COOLER TEMPERATURES ALONG WITH CONTINUED CHANCES FOR  
SHOWERS. AFTER VERY WARM TEMPERATURES THIS WEEKEND, TEMPERATURES  
WILL COOL TO BELOW NORMAL TO AROUND NORMAL READINGS IN THE 50S AND  
60S FOR NEXT WEEK. HOOLEY  
 

 
   
AVIATION
 
 
CLEAR SKIES AND LIGHT WINDS WILL PREVAIL TODAY AND TONIGHT. JKL  
 

 
   
PRELIMINARY POINT TEMP/POPS
 
 
TDY FRI SAT SUN MON TUE WED  
-------------------------------------------------------  
BIL 067 039/073 044/081 050/076 042/060 038/059 038/060  
0/U 00/U 01/U 23/T 33/W 22/W 23/W  
LVM 070 035/073 040/077 045/066 032/054 032/055 033/057  
0/U 00/U 02/T 34/T 33/W 34/W 34/W  
HDN 069 037/075 042/084 049/080 043/063 038/061 037/062  
0/U 00/U 01/U 13/T 33/W 22/W 23/W  
MLS 065 038/071 043/079 051/079 046/062 039/057 038/060  
0/U 00/U 00/U 12/T 42/W 12/W 13/W  
4BQ 063 037/070 041/077 052/077 043/063 038/056 037/057  
0/U 00/U 00/U 12/T 22/W 11/B 13/W  
BHK 063 037/066 038/070 046/074 045/063 037/055 036/058  
0/U 00/U 00/N 01/B 31/B 11/B 12/W  
SHR 064 032/071 039/080 048/075 040/061 036/058 036/057  
0/U 00/U 01/U 23/T 32/W 23/W 24/W  
 

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

 
 

 
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