Thursday, September 30, 2010

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

SPC Tornado Watch 688
Thu, 30 Sep 2010 04:01:03 -0500


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  URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 688 NWS STORM PREDICTION CENTER NORMAN OK 455 AM EDT THU SEP 30 2010  THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF          DISTRICT OF COLUMBIA        DELAWARE        EASTERN MARYLAND        EASTERN NORTH CAROLINA        SOUTHERN NEW JERSEY        EASTERN VIRGINIA        COASTAL WATERS  EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 455 AM UNTIL 100 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 60 STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHWEST OF DOVER DELAWARE TO 40 MILES SOUTH OF JACKSONVILLE NORTH CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).  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...THIS TORNADO WATCH REPLACES TORNADO WATCH NUMBER 687. WATCH NUMBER 687 WILL NOT BE IN EFFECT AFTER 455 AM EDT.   DISCUSSION...A WELL-DEFINED LOW NEAR THE NC/SC BORDER WILL CONTINUE NWD ACROSS CENTRAL NC/VA THROUGH THE MORNING.  A SLOW-MOVING FRONT WILL ALSO MOVE INLAND SOME ACROSS VA IN ADVANCE OF THE LOW...ALLOWING THE MOIST SECTOR WITH LOW 70S DEWPOINTS AND WEAK SURFACE-BASED INSTABILITY TO LIKEWISE SPREAD INLAND.  EVEN THOUGH THE LOW SHOULD WEAKEN GRADUALLY THROUGH THE MORNING...A BELT OF 60-70 KT LOW-LEVEL FLOW AND ENHANCED SRH WILL BE MAINTAINED ALONG THE SLOW-MOVING FRONT.  THE STRONG SHEAR/WEAK INSTABILITY ENVIRONMENT WILL SUPPORT SEVERAL BANDS WITH EMBEDDED SUPERCELLS AND AN ATTENDANT RISK FOR A FEW TORNADOES...AS WELL AS ISOLATED STRONG/DAMAGING GUSTS.  THE PRIMARY TORNADO THREAT EARLY THIS MORNING WILL REMAIN ACROSS NC/SE VA...WITH THE THREAT EXPANDING NWD DURING THE MORNING TOWARD THE DELMARVA...AND POTENTIALLY AS FAR NE AS SRN NJ BY LATE MORNING.  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 450. MEAN STORM MOTION VECTOR 18045.   ...THOMPSON  
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SPC Tornado Watch 688 Status Reports
Thu, 30 Sep 2010 04:01:11 -0500


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  STATUS FOR WATCH 0688 HAS NOT BEEN ISSUED YET 
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SPC Tornado Watch 687 Status Reports
Thu, 30 Sep 2010 02:37:04 -0500


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  STATUS REPORT ON WW 687  SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 60 S CRE TO 10 ESE CRE TO 35 ENE FLO.  ..EDWARDS..09/30/10  ATTN...WFO...MHX...AKQ...ILM...RAH...CHS...   STATUS REPORT FOR WT 687   SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS   NCC013-015-017-019-029-031-041-047-049-051-053-055-061-065-073- 079-083-091-095-101-103-107-117-127-129-131-133-137-139-141-143- 147-163-177-187-191-195-300840-  NC  .    NORTH CAROLINA COUNTIES INCLUDED ARE  BEAUFORT             BERTIE              BLADEN               BRUNSWICK            CAMDEN              CARTERET             CHOWAN               COLUMBUS            CRAVEN               CUMBERLAND           CURRITUCK           DARE                 DUPLIN               EDGECOMBE           GATES                GREENE               HALIFAX             HERTFORD             HYDE                 JOHNSTON            JONES                LENOIR               MARTIN              NASH                 NEW HANOVER          NORTHAMPTON         ONSLOW               PAMLICO              PASQUOTANK          PENDER               PERQUIMANS           PITT                SAMPSON              TYRRELL              WASHINGTON          WAYNE                WILSON                  SCC051-300840-  SC  
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