680  
FXUS65 KBYZ 242013  
AFDBYZ  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BILLINGS MT  
213 PM MDT SAT MAY 24 2025  
   
KEY MESSAGES
 
 
- PERIODIC SCATTERED SHOWERS, SOME LATE DAY THUNDERSTORMS, AND  
SEASONABLE TEMPS THROUGH THE WEEKEND.  
 
- MEMORIAL DAY FORECAST: MOSTLY SUNNY WITH A CHANCE OF  
SHOWERS/THUNDERSTORMS IN THE AFTERNOON AND EVENING FOR MOST  
LOCATIONS; HIGH TEMPS IN THE LOWER 60S TO MID 70S (COOLEST ALONG  
MT/DK BORDER).  
 
- TEMPS PUSHING 80 DEGREES BY THURSDAY FOR MOST LOCATIONS.  
 
 

 
   
DISCUSSION
 
 
TODAY THROUGH MONDAY...  
 
WATER VAPOR SATELLITE IMAGERY SHOWS MOISTURE MOVING UP FROM THE  
SOUTH INTO SOUTHEAST MONTANA. THIS MOISTURE COMBINED WITH  
500-1000 J/KG OF CAPE WILL COMBINE TO PRODUCE SHOWERS AND  
THUNDERSTORMS ACROSS THE FORECAST AREA. THE HIGHEST CHANCES (70%)  
WILL BE FOR LOCATIONS IN THE BEARTOOTH/BIGHORN MOUNTAINS AND  
LOCATIONS IN BIGHORN AND SHERIDAN COUNTIES. OTHER LOCATIONS OF THE  
FORECAST AREA HAVE A 30% CHANCE. 0-6 KM SHEAR WILL REMAIN LESS  
THAN 30 KTS HELPING TO LIMIT SEVERE STORM DEVELOPMENT. THE NBM IS  
GIVING LOCATIONS FROM SOUTHERN ROSEBUD AND BIGHORN COUNTIES TO  
SHERIDAN COUNTY A 40-60% CHANCE FOR GETTING GREATER THAN 0.25  
INCHES OF PRECIPITATION.  
 
CONTINUED HIGH PRESSURE TO OUR EAST IN THE DAKOTAS WILL KEEP A  
MOIST SOUTHEAST WIND LEADING TO CONTINUED PRECIPITATION CHANCES  
FOR SUNDAY AND MONDAY. THESE ARE EXPECTED TO BE MORE SCATTERED IN  
NATURE WITH 20-30% CHANCES, MAINLY FOR SOUTHERN AND EASTERN PARTS  
OF THE FORECAST AREA.  
 
SOUNDINGS INDICATE THE POTENTIAL FOR FOG SUNDAY MORNING. MOIST  
SOILS ACROSS THE REGION, LOW LEVEL INVERSIONS, DEWPOINT  
DEPRESSIONS BETWEEN 1 AND 3 C, AND LIGHT WINDS FOR LOW LYING  
AREAS WEST OF ROSEBUD COUNTY WILL COMBINE TO CREATE PATCHY FOG.  
LOCATIONS FROM ROSEBUD COUNTY AND EAST WILL LIKELY HAVE TOO STRONG  
OF WINDS TO SEE FOG DEVELOPMENT.  
 
TEMPERATURES TODAY AND SUNDAY WILL BE IN THE HIGH 60S F TO LOW  
70S F FOR MUCH OF THE REGION WITH COOLER TEMPERATURES IN THE 50S  
F FOR LOCATIONS ALONG THE DAKOTAS BORDER. TORGERSON  
 
TUESDAY THROUGH SATURDAY...  
 
EARLY NEXT WEEK, A 500 MB TROUGH WILL SET UP TO OUR EAST AND  
REMAIN IN PLACE UNTIL LATE IN THE WEEK. THIS WILL BLOCK UPPER  
LEVEL FLOW AND CREATE RIDGING OVER MONTANA THURSDAY THROUGH  
SATURDAY. THE STRONGEST 500 MB HEIGHT ANOMALIES WILL BE TO OUR  
NORTH IN CANADA BUT TEMPERATURES LATE IN THE WEEK WILL BE AROUND  
10 DEGREES ABOVE AVERAGE. THIS WILL MEAN TEMPERATURES INCREASING  
FROM THE LOW 70S F MONDAY THROUGH WEDNESDAY, INTO THE HIGH 70S AND  
80S F STARTING THURSDAY. EVEN THOUGH ABOVE AVERAGE HEIGHTS WILL  
PREVAIL THROUGHOUT THE LONG TERM, SOUTHEAST WINDS WILL KEEP  
THINGS ACTIVE WITH 20-40% PRECIPITATION CHANCES DAILY. TORGERSON  
 

 
   
AVIATION
 
 
THE MAIN HAZARD OVER THE NEXT 24 HOURS WILL BE PATCHY FOG FOR  
LOCATIONS EAST OF ROSEBUD COUNTY SATURDAY MORNING. THIS INCLUDES  
THE TAF SITES OF KBIL, KLVM, AND KSHR. FOG IS EXPECTED TO  
DISSIPATE BY 18Z. SHOWERS AND THUNDERSTORMS WILL DECREASE AFTER  
03Z TONIGHT. SUNDAY WILL SEE ADDITIONAL SHOWER AND THUNDERSTORM  
CHANCES (20-40%) FROM KBIL AND AREAS TO THE EAST. TORGERSON  
 

 
   
PRELIMINARY POINT TEMP/POPS
 
 
SUN MON TUE WED THU FRI SAT  
-----------------------------------------------------------  
BIL 045/071 046/075 049/073 051/074 049/077 052/079 053/082  
22/W 01/U 13/T 22/W 01/U 13/T 21/U  
LVM 042/070 043/075 049/072 047/073 046/076 049/076 050/079  
20/U 02/T 36/T 32/W 12/T 23/T 21/U  
HDN 045/071 047/074 047/074 049/074 047/080 050/080 051/083  
33/T 12/W 13/W 22/W 11/U 12/T 21/U  
MLS 047/069 049/070 047/072 047/073 047/078 050/081 053/084  
32/W 12/W 22/W 22/W 11/U 11/U 11/U  
4BQ 047/064 047/064 046/069 046/069 046/075 049/078 052/080  
23/W 33/W 22/W 22/W 11/U 11/U 11/U  
BHK 042/064 044/064 042/065 041/067 042/071 045/076 049/080  
21/B 23/W 32/W 22/W 11/U 11/U 11/U  
SHR 040/065 041/069 043/071 046/069 043/074 047/076 049/077  
35/T 24/T 14/T 34/T 12/T 13/T 22/T  
 

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

 
 

 
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