269 
FPUS65 KBIL 032021
AFDBIL
 
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
145 PM MDT WED JUN 3 1998
 
TOUGH FORECAST FOR JUNE. UPPER TROUGH FROM WESTERN MONTANA INTO NEVADA
PROGGED TO SWING THROUGH THE AREA TONIGHT AND TOMORROW. ABUNDANT LOW TO
MID LEVEL MOISTURE WILL BE LAYING AROUND TO WORK WITH. ONE SHORTWAVE
MOVING INTO EASTERN IDAHO WILL GET THINGS GOING AGAIN TONIGHT. PROBLEM
IS LOCATION OF PRECIPITATION BAND. ETA SHIFTS THE BAND FARTHER SOUTH AND
I ACCEPT THIS SOLUTION AS WATER VAPOR AND VISIBLE IMAGERY SHOWING DRIER
AIR WORKING SOUTH FROM NORTHERN MONTANA. 700MB LOW PROGGED OVER CENTRAL
WYOMING WITH UPSLOPE CONTINUING TROUGH THURSDAY. ETA LAYS DOWN
SIGNIFICANT QPF OVER SOUTHERN MONTANA AND NORTHERN WYOMING. CERTAINLY
COLD ENOUGH FOR DECENT SNOW ACCUMULATIONS. HAVE COORDINATED WITH CYS AND
GTF AND WILL ISSUE SNOW ADVISORY FOR ELEVATIONS ABOVE 4500 FEET OVER
SOUTHERN MONTANA AND ALSO FOR LOWER ELEVATIONS OF SHERIDAN COUNTY. WILL
KEEP THE BIG HORN MOUNTAINS BELOW WARNING CRITERIA. TROUGH MOVES EAST
THURSDAY BUT STILL KEEP A WEAK NORTH FLOW SO WILL NOT HAVE MUCH OF AN
AIRMASS CHANGE. WITH DRIER AIR...HOWEVER WILL GRADUALLY WARM THINGS UP.
COOL UNSTABLE AIRMASS WILL ALLOW FOR LOW POPS SOUTH CENTRAL CONTINUING
AND WILL LOOK FOR CLOUDS QUICKLY DEVELOPING AGAIN THURSDAY AFTERNOON. A
SHORTWAVE WILL ROLL THROUGH EASTERN MONTANA FRIDAY...SO WILL INCLUDE LOW
POPS THERE. A DIFFERENT SHORTWAVE WILL DIVE DOWN TOWARD SOUTHWEST
MONTANA FRIDAY...SO WILL KEEP POPS GOING FOR SOUTH CENTRAL MONTANA.
HUMPHREY
 
BIL EB 038/054 036/062 041 556322
LVM .. 034/059 032/065 ... 556323
HDN .. 036/056 034/063 ... 556422
MLS .. 039/061 037/065 ... 552002
4BQ .. 040/059 037/065 ... 553202
BHK .. 035/059 033/064 ... 552002
SHR OB 036/045 033/057 037 557632