SEL9
SPC WW 010152
MTZ000-NDZ000-010900-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 819
NWS STORM PREDICTION CENTER NORMAN OK
855 PM CDT WED AUG 31 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
FAR EASTERN MONTANA
WESTERN AND CENTRAL NORTH DAKOTA
EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 855 PM
UNTIL 400 AM CDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES NORTH
NORTHWEST OF GLENDIVE MONTANA TO 55 MILES EAST SOUTHEAST OF MINOT
NORTH DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
DISCUSSION...AIDED BY DPVA/INCREASING WARM ADVECTION...CLUSTERS OF
STORMS WILL CONTINUE TO STEADILY SPREAD EAST-NORTHEASTWARD THROUGH
THE EVENING FROM FAR EASTERN MT INTO WESTERN/CENTRAL ND...WITH SOME
ADDITIONAL UPSCALE GROWTH/ORGANIZATION POSSIBLE INTO AN MCS. A
RELATIVELY UNSTABLE/STRONGLY SHEARED ENVIRONMENT WILL SUPPORT A
SUSTAINED SEVERE THREAT WITH DAMAGING WINDS/SEVERE HAIL POSSIBLE.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 23030.
...GUYER/THOMPSON
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