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

SPC Tornado Watch 648
Wed, 08 Sep 2010 19:00:04 -0500

  URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 648 NWS STORM PREDICTION CENTER NORMAN OK 540 PM CDT WED SEP 8 2010  THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF          SOUTHWEST ARKANSAS        SOUTHERN AND EASTERN OKLAHOMA        CENTRAL AND NORTHERN TEXAS  EFFECTIVE THIS WEDNESDAY AFTERNOON AND THURSDAY MORNING FROM 540 PM UNTIL 100 AM CDT.  TORNADOES...HAIL TO 1 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 80 STATUTE MILES EAST AND WEST OF A LINE FROM 5 MILES NORTHEAST OF MCALESTER OKLAHOMA TO 25 MILES SOUTH SOUTHEAST OF CORSICANA TEXAS.  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.  DISCUSSION...SEVERAL SMALLER SCALE AREAS WITHIN LARGER SCALE REMNANT CIRCULATION OF "HERMINE" APPEAR TO HAVE THE POTENTIAL FOR MAINLY BRIEF TORNADOES THIS EVE: (1) ALONG LOW LVL CONFLUENCE AXIS IN ZONE OF GREATEST LOW LVL THETA-E ALONG AND E OF I-35 IN N TX...(2) ALONG BAND OF STORMS EMBEDDED IN WARM/MOISTURE-RICH AIR IN NE TX; OUTFLOW-DOMINANT STORM LINE MOVING NWD FROM SHV AREA MAY COMPROMISE PROBABILITIES FOR LOW LVL STORM ROTATION INITIALLY...BUT AREA WILL HAVE BENEFIT OF LOW LVL JET SHIFTING NNE INTO SE OK LATER THIS EVE...(3) AREA ALONG W-E WARM FRONT IN SW AR...WHERE DEEP SHEAR IS WEAKER BUT ENHANCED LOW LVL DIRECTIONAL SHEAR EXISTS...AND (4) AREA OF COMPARATIVELY LOWER THETA-E AIR NEAR LOW LVL MAIN CIRCULATION CENTER IN NW TX/SW OK; ANY THREAT THAT DOES DEVELOP IN THIS REGION SHOULD TO SHIFT ENE FROM TOWARD ADA LATER THIS EVE.  AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION VECTOR 21030.   ...CORFIDI  

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SPC Tornado Watch 648 Status Reports
Wed, 08 Sep 2010 19:00:06 -0500

  STATUS REPORT ON WW 648  THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.  ..JEWELL..09/08/10  ATTN...WFO...SHV...OUN...TSA...FWD...   STATUS REPORT FOR WT 648   SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS   ARC027-057-061-073-081-091-099-133-090040-  AR  .    ARKANSAS COUNTIES INCLUDED ARE  COLUMBIA             HEMPSTEAD           HOWARD               LAFAYETTE            LITTLE RIVER        MILLER               NEVADA               SEVIER                 OKC005-013-019-023-029-049-061-063-067-069-077-079-085-089-095- 099-121-123-127-137-090040-  OK  .    OKLAHOMA COUNTIES INCLUDED ARE  ATOKA                BRYAN               CARTER               CHOCTAW              COAL                GARVIN               HASKELL              HUGHES              JEFFERSON            JOHNSTON             LATIMER             LE FLORE             LOVE                 MCCURTAIN           MARSHALL             MURRAY               PITTSBURG           PONTOTOC             PUSHMATAHA           STEPHENS               TXC001-037-063-067-085-097-113-119-121-139-145-147-159-161-181- 

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