SPC Severe Thunderstorm Watch 676
Tue, 21 Sep 2010 12:55:02 -0500
URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 676 NWS STORM PREDICTION CENTER NORMAN OK 155 PM EDT TUE SEP 21 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHERN AND CENTRAL LOWER MICHIGAN LAKE HURON LAKE MICHIGAN EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 155 PM UNTIL 900 PM 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 65 STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTHEAST OF ROBEN HOOD MICHIGAN TO 30 MILES NORTH OF ALPENA MICHIGAN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6). 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...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND INTENSITY THIS AFTERNOON AHEAD OF STRONG MIDLEVEL IMPULSE PROGRESSING EWD THROUGH THE REGION. STRONG DIABATIC HEATING HAS CONTRIBUTED TO SBCAPE OF 1000-1500 J/KG...AND EFFECTIVELY STEEPENED LOW-LEVEL LAPSE RATES. WHEN COUPLED WITH 40-50+ KT SWLY FLOW OBSERVED AS LOW AS 1-2 KM AGL /PER APX VWP/...ENVIRONMENT WILL FAVOR THE DEVELOPMENT OF ORGANIZED...SEVERE STORMS CAPABLE OF MAINLY DAMAGING WIND GUSTS. 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 26035. ...MEADRead more
SPC Severe Thunderstorm Watch 676 Status Reports
Tue, 21 Sep 2010 12:55:11 -0500
STATUS FOR WATCH 0676 HAS NOT BEEN ISSUED YETRead more
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