Severe Thunderstorm Warning 85, NWS Billings, MT

SOUTH CENTRAL AND SOUTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
443 PM MDT THU JUN 28 2001

.FRI AND SAT...
LATEST CONVECTION FIRING NORTH OF BILLINGS AREA LINES UP WITH 700 MB
WARM FRONTAL LIFT ZONE. THIS ZONE AMPLIFIES OVER SOUTHEAST MONTANA...IN
PARTICULAR OVER NORTHERN ROSEBUD...CUSTER AND FALLON COUNTIES. WILL
UPDATE ZONES TO INDICATE LESSER THREAT OVER THE SOUTHERN ZONES
TONIGHT. ANTICIPATE THAT SEVERE WEATHER WILL CONTINUE INTO THE LATE
NIGHT HOURS ACROSS THE NORTHERN ZONES. SOUTHEAST MONTANA WILL SEE
HELICITIES OF 250-300 M2/S2 WITH CAPES IN EXCESS OF 2000 J/KG AROUND
09Z...THUS SUPERCELLS APPEAR LIKELY. BORSUM

.SUN...MON...TUE...WED...THU...
TRAPPED LOW BLOCKING SYSTEM IN THE CENTRAL U.S. WITH LOW SLOWLY FILLING
THROUGH TUESDAY WITH THE RIDGE SHIFTING INTO WESTERN MONTANA. A SERIES
OF DISTURBANCES IN THE FLOW ALOFT WILL CARVE A TROUGH INTO THE NORTHERN
PLAINS AFTER TUESDAY WITH SURFACE HIGH PRESSURE MOVING INTO EASTERN
MONTANA. THIS WILL BRING COOLER TEMPERATURES TO THE AREA FROM TUESDAY
ON. RESIDUAL MOISTURE FROM RECENT THUNDERSTORMS WILL GENERATE SOME
ISOLATED CONVECTION TUESDAY THROUGH THE END OF THE WEEK. THORICHT

    FRI     SAT     SUN     MON     TUE     WED     THU
-----------------------------------------------------------
BIL 063/082 063/083 062/086 058/082 053/082 057/082 056/085
    33/T    30/B    33/T    22/B    22/B    22/B    22/B
LVM 057/080 057/082 055/084 055/080 050/080 050/080 052/080
    33/T    30/B    33/T    22/B    22/B    22/B    22/B
HDN 061/084 061/086 060/089 059/085 051/085 053/084 053/087
    33/T    30/B    33/T    22/B    22/B    22/B    22/B
MLS 065/084 065/083 064/089 061/085 054/084 058/083 056/083
    63/T    33/T    33/T    22/B    22/B    22/B    22/B
4BQ 065/082 065/081 063/087 060/083 052/083 056/082 054/082
    33/T    33/T    33/T    22/B    22/B    22/B    22/B
BHK 063/082 063/081 062/086 060/081 050/081 055/081 053/082
    63/T    33/T    33/T    22/B    22/B    22/B    22/B
SHR 060/082 058/081 055/087 055/081 050/081 050/079 050/082
    34/T    40/B    33/T    22/B    22/B    22/B    22/B