Compact News: NOAA's National Weather Service SPC Tornado/Severe Thunderstorm Watches Update

Thursday, September 30, 2010

NOAA's National Weather Service SPC Tornado/Severe Thunderstorm Watches Update

SPC Tornado Watch 689
Thu, 30 Sep 2010 11:40:03 -0500

URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 689 NWS STORM PREDICTION CENTER NORMAN OK 1240 PM EDT THU SEP 30 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF DELAWARE NORTHEAST MARYLAND SOUTHEAST PENNSYLVANIA COASTAL WATERS EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1240 PM UNTIL 700 PM EDT. TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTHWEST OF ALLENTOWN PENNSYLVANIA TO 35 MILES SOUTHEAST OF PATUXENT RIVER MARYLAND. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9). REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND 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. OTHER WATCH INFORMATION...CONTINUE...WW 688... DISCUSSION...A BAND OF THUNDERSTORMS EXTENDS FROM THE CHESAPEAKE BAY NORTHWARD INTO EASTERN PA. SEVERAL OF THESE STORMS HAVE SHOWN WEAK TO MODERATE MID/LOW LEVEL ROTATION DUE TO VERY STRONG VERTICAL SHEAR PROFILES. DESPITE WEAK INSTABILITY...THE RISK WITH BE PRESENT FOR ISOLATED TORNADOES THROUGH THE AFTERNOON OVER THE WATCH AREA. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM MOTION VECTOR 21040. ...HART

SPC Tornado Watch 689 Status Reports
Thu, 30 Sep 2010 11:40:11 -0500

  STATUS FOR WATCH 0689 HAS NOT BEEN ISSUED YET

SPC Tornado Watch 688 Status Reports
Thu, 30 Sep 2010 10:39:03 -0500

  STATUS REPORT ON WW 688  SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 E ILM TO 35 E RIC TO 15 SW DCA.  ..GOSS..09/30/10  ATTN...WFO...LWX...PHI...AKQ...MHX...ILM...RAH...   STATUS REPORT FOR WT 688   SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS   DEC001-003-005-301640-  DE  .    DELAWARE COUNTIES INCLUDED ARE  KENT                 NEW CASTLE          SUSSEX                 DCC001-301640-  DC  .    DISTRICT OF COLUMBIA COUNTIES INCLUDED ARE  DISTRICT OF COLUMBIA    MDC003-005-009-011-013-015-017-019-025-027-029-031-033-035-037- 039-041-045-047-510-301640-  MD  .    MARYLAND COUNTIES INCLUDED ARE  ANNE ARUNDEL         BALTIMORE           CALVERT              CAROLINE             CARROLL             CECIL                CHARLES              DORCHESTER          HARFORD

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