SPC Severe Thunderstorm Watch 679
Tue, 21 Sep 2010 19:05:03 -0500
URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 679 NWS STORM PREDICTION CENTER NORMAN OK 805 PM EDT TUE SEP 21 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF CENTRAL AND SOUTHERN LOWER MICHIGAN LAKE HURON LAKE MICHIGAN EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 805 PM UNTIL 100 AM EDT. HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES EAST OF BAD AXE MICHIGAN TO 30 MILES SOUTH SOUTHWEST OF MUSKEGON MICHIGAN. 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. OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES SEVERE THUNDERSTORM WATCH NUMBER 676. WATCH NUMBER 676 WILL NOT BE IN EFFECT AFTER 805 PM EDT. CONTINUE...WW 677...WW 678... DISCUSSION...ONGOING SEVERE STORMS ALONG DIFFUSE OUTFLOW BOUNDARY ACROSS CENTRAL LOWER MI WILL LIKELY PERSIST...WHILE ADDITIONAL STORMS OVER LAKE MI MOVE ENEWD INTO SW LOWER MI BY 01Z. RESIDUAL STEEP LOW-LEVEL LAPSE RATES...MLCAPE NEAR 1000 J/KG...AND EFFECTIVE BULK SHEAR AOA 40 KT WILL CONTINUE TO SUPPORT ORGANIZED CELLS/LINE SEGMENTS CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING WINDS. THE SEVERE THREAT SHOULD BEGIN TO DIMINISH TOWARD 04-05Z AS THE BOUNDARY LAYER STABILIZES AND INSTABILITY WEAKENS. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 25040. ...THOMPSONRead more
SPC Severe Thunderstorm Watch 679 Status Reports
Tue, 21 Sep 2010 19:05:11 -0500
STATUS FOR WATCH 0679 HAS NOT BEEN ISSUED YETRead more
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