Thursday, September 9, 2010

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

SPC Tornado Watch 652
Thu, 09 Sep 2010 19:00:03 -0500


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  URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 652 NWS STORM PREDICTION CENTER NORMAN OK 625 PM CDT THU SEP 9 2010  THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF          NORTHEAST ARKANSAS        THE MISSOURI BOOTHEEL        WEST TENNESSEE  EFFECTIVE THIS THURSDAY EVENING FROM 625 PM UNTIL 1100 PM CDT.  TORNADOES...HAIL TO 1.5 INCHES 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 35 MILES NORTHEAST OF WALNUT RIDGE ARKANSAS TO 5 MILES SOUTH SOUTHWEST OF MEMPHIS TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).  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 650...WW 651...  DISCUSSION...SMALL REGION INVOF NW-SE OUTFLOW BOUNDARY/QSTNRY FRONT WITH LOW LCLS MAY SERVE AS A FOCUS FOR LOW LVL STORM ROTATION/BRIEF TORNADOES THIS EVE AS LOW/MID LVL SPEED MAX ASSOCIATED WITH REMNANTS OF T.D HERMINE SKIRT THE REGION.  AVIATION...TORNADOES AND 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 28025.   ...CORFIDI  
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SPC Severe Thunderstorm Watch 650
Thu, 09 Sep 2010 19:00:10 -0500


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  URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 650 NWS STORM PREDICTION CENTER NORMAN OK 235 PM MDT THU SEP 9 2010  THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF          EXTREME EASTERN MONTANA        WESTERN NORTH DAKOTA        WESTERN SOUTH DAKOTA  EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 235 PM UNTIL 1000 PM MDT.  HAIL TO 2 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 90 STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH NORTHEAST OF WILLISTON NORTH DAKOTA TO 50 MILES SOUTHEAST OF RAPID CITY SOUTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).  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...THUNDERSTORMS ARE BEGINNING TO DEVELOP FROM SE MT INTO WRN SD ALONG THE NOSE OF A DEEPLY MIXED BOUNDARY LAYER/STEEP LOW-LEVEL LAPSE RATES.  AN INCREASE IN STORM COVERAGE/INTENSITY IS EXPECTED THROUGH THE AFTERNOON/EVENING AS THE LOW LEVELS CONTINUE TO DESTABILIZE S OF A WARM FRONT IN ND...AND AS A STRONG MIDLEVEL TROUGH MOVES NEWD FROM WRN WY.  THERE WILL BE A SMALL WINDOW OF OPPORTUNITY FOR AN ISOLATED TORNADO IN SW ND LATE THIS AFTERNOON AS THE INITIAL CELLULAR STORMS INTERACT WITH THE SURFACE WARM FRONT.  HOWEVER...SOMEWHAT MARGINAL MOISTURE AND WEAKER LOW-LEVEL SHEAR ACROSS WRN SD AND ERN MT...AS WELL AS A MORE STABLE BOUNDARY LAYER N OF THE WARM FRONT IN ND...WILL SUPPORT LARGE HAIL AND DAMAGING WINDS AS THE PRIMARY SEVERE THREATS.  AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION VECTOR 24035.   ...THOMPSON  
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SPC Severe Thunderstorm Watch 650
Thu, 09 Sep 2010 19:00:10 -0500


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  URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 650 NWS STORM PREDICTION CENTER NORMAN OK 235 PM MDT THU SEP 9 2010  THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF          EXTREME EASTERN MONTANA        WESTERN NORTH DAKOTA        WESTERN SOUTH DAKOTA  EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 235 PM UNTIL 1000 PM MDT.  HAIL TO 2 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 90 STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH NORTHEAST OF WILLISTON NORTH DAKOTA TO 50 MILES SOUTHEAST OF RAPID CITY SOUTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).  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...THUNDERSTORMS ARE BEGINNING TO DEVELOP FROM SE MT INTO WRN SD ALONG THE NOSE OF A DEEPLY MIXED BOUNDARY LAYER/STEEP LOW-LEVEL LAPSE RATES.  AN INCREASE IN STORM COVERAGE/INTENSITY IS EXPECTED THROUGH THE AFTERNOON/EVENING AS THE LOW LEVELS CONTINUE TO DESTABILIZE S OF A WARM FRONT IN ND...AND AS A STRONG MIDLEVEL TROUGH MOVES NEWD FROM WRN WY.  THERE WILL BE A SMALL WINDOW OF OPPORTUNITY FOR AN ISOLATED TORNADO IN SW ND LATE THIS AFTERNOON AS THE INITIAL CELLULAR STORMS INTERACT WITH THE SURFACE WARM FRONT.  HOWEVER...SOMEWHAT MARGINAL MOISTURE AND WEAKER LOW-LEVEL SHEAR ACROSS WRN SD AND ERN MT...AS WELL AS A MORE STABLE BOUNDARY LAYER N OF THE WARM FRONT IN ND...WILL SUPPORT LARGE HAIL AND DAMAGING WINDS AS THE PRIMARY SEVERE THREATS.  AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION VECTOR 24035.   ...THOMPSON  
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SPC Tornado Watch 652 Status Reports
Thu, 09 Sep 2010 19:00:05 -0500


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  STATUS REPORT ON WW 652  THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.  ..JEWELL..09/09/10  ATTN...WFO...MEG...   STATUS REPORT FOR WT 652   SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS   ARC021-031-035-037-055-075-093-111-121-123-100040-  AR  .    ARKANSAS COUNTIES INCLUDED ARE  CLAY                 CRAIGHEAD           CRITTENDEN           CROSS                GREENE              LAWRENCE             MISSISSIPPI          POINSETT            RANDOLPH             ST. FRANCIS             MOC069-155-100040-  MO  .    MISSOURI COUNTIES INCLUDED ARE  DUNKLIN              PEMISCOT               TNC033-045-047-053-075-097-157-167-100040-  TN  .    TENNESSEE COUNTIES INCLUDED ARE  CROCKETT             DYER                FAYETTE              GIBSON               HAYWOOD             LAUDERDALE           
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SPC Tornado Watch 651 Status Reports
Thu, 09 Sep 2010 19:00:09 -0500


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  STATUS REPORT ON WW 651  THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.  ..JEWELL..09/09/10  ATTN...WFO...BIS...ABR...UNR...   STATUS REPORT FOR WT 651   SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS   NDC001-007-011-025-033-037-041-053-057-059-065-085-087-089- 100040-  ND  .    NORTH DAKOTA COUNTIES INCLUDED ARE  ADAMS                BILLINGS            BOWMAN               DUNN                 GOLDEN VALLEY       GRANT                HETTINGER            MCKENZIE            MERCER               MORTON               OLIVER              SIOUX                SLOPE                STARK                  SDC031-105-100040-  SD  .    SOUTH DAKOTA COUNTIES INCLUDED ARE  CORSON               PERKINS                THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY.  PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.  
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SPC Severe Thunderstorm Watch 650 Status Reports
Thu, 09 Sep 2010 19:00:12 -0500


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  STATUS REPORT ON WW 650  THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.  ..JEWELL..09/09/10  ATTN...WFO...BYZ...GGW...BIS...UNR...ABR...   STATUS REPORT FOR WS 650   SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS   MTC011-017-021-025-055-079-083-085-091-109-100040-  MT  .    MONTANA COUNTIES INCLUDED ARE  CARTER               CUSTER              DAWSON               FALLON               MCCONE              PRAIRIE              RICHLAND             ROOSEVELT           SHERIDAN             WIBAUX                  NDC013-023-055-061-101-105-100040-  ND  .    NORTH DAKOTA COUNTIES INCLUDED ARE  BURKE                DIVIDE              MCLEAN               MOUNTRAIL            WARD                WILLIAMS               SDC007-019-041-055-063-071-075-081-093-103-113-117-137-100040-  SD  .    SOUTH DAKOTA COUNTIES INCLUDED ARE  BENNETT              BUTTE               DEWEY                
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