Severe Thunderstorm Warning 114, NWS Billings, MT

SOUTH CENTRAL AND SOUTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
850 PM MDT FRI AUG 11 2000

.SAT AND SUN...

AN UPPER LOW OVER SOUTHERN SASKATCHEWAN WITH A TRAILING VORTICITY TROUGH
INTO EASTERNMOST MONTANA WAS QUICKLY EXITING THE STATE. A SEVERE
THUNDERSTORM WATCH REMAINS OVER CUSTER AND FALLON COUNTIES...BUT
INSTABILITY TRIGGER WAS QUICKLY MOVING INTO THE DAKOTAS. ONLY STORM
ACTIVITY OVER THE FORECAST AREA AT THE MOMENT IS OVER CARTER COUNTY. A
NEARLY FLAT 500MB HEIGHT RIDGE MOVES IN FOR THE OVERNIGHT HOURS.
WILDFIRE SMOKE HAS REDUCED VISIBILITIES IN THE LIVINGSTON AREA.

WILL ISSUE AN UPDATE TO ZONES TO REMOVE ISOLATED STORMS FOR WEST AND
CENTRAL FORECAST AREA. MINIMUM TEMPS LOOK GOOD. MAY NEED TO MAKE MINOR
ADJUSTMENTS TO WINDS. AN UPDATE WILL BE SENT. CANEPA

.MON...TUE...AND WED...
EXTENDED MODELS PRETTY SIMILAR TO YESTERDAY. FLOW FAIRLY ZONAL FOR
MONDAY. RIDGE STARTS TO BUILD BACK UP ON TUESDAY AS STRONG WAVE MOVES
INTO THE NORTHWEST COAST. THE RIDGE PROGGED TO GET BANGED DOWN ON
WEDNESDAY AS THE AFOREMENTIONED WAVES SWEEPS ACROSS SOUTHERN CANADA. A
SECONDARY WEAKER WAVE PROGGED TO SWEEP FARTHER SOUTH INTO THE WEST
TUESDAY. WILL KEEP THE MENTION OF THUNDERSTORMS IN THE WEST...BUT PULL
THEM OUT OF THE EAST. STRONG WAVE THEN CRASHES THE RIDGE DOWN WEDNESDAY
AND PUSHES A STRONG COLD FRONT ACROSS THE AREA. THIS FRONT COULD PRODUCE
STRONG WINDS ON WEDNESDAY...SO WILL MENTION. HUMPHREY

BIL UUBTN 059/087 059/092 059/090 061/092 059/085 640000 55
LVM UUBTN 055/087 055/089 055/090 057/092 057/085 640000 55
HDN UUBTN 055/090 057/092 057/091 059/093 059/086 640000 55
MLS UUBBN 062/090 062/093 060/091 062/093 062/086 642000 55
4BQ UUBBN 060/090 060/092 060/091 062/093 062/086 642000 55
BHK UUBBN 058/088 058/093 057/090 059/092 059/085 642000 55
SHR UUBBN 055/090 057/090 056/090 058/092 058/085 640000 55

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