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

Thursday, February 24, 2011

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

SPC Severe Thunderstorm Watch 12
Thu, 24 Feb 2011 04:14:02 -0600

URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 12 NWS STORM PREDICTION CENTER NORMAN OK 410 AM CST THU FEB 24 2011 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTHERN AND WESTERN OKLAHOMA WEST CENTRAL AND NORTHWEST TEXAS EFFECTIVE THIS THURSDAY MORNING FROM 410 AM UNTIL 1100 AM CST. 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 60 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES NORTH OF BIG SPRING TEXAS TO 40 MILES SOUTH OF CHANDLER OKLAHOMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2). 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 EXPECTED TO INCREASE OVER W CNTRL AND NW TX THROUGH LATER THIS MORNING AS SMALL SCALE IMPULSE AHEAD OF LARGER SCALE UPR TROUGH NOW OVER NM CONTINUES NE AND FURTHER INTERACTS WITH WRN EDGE OF PW AXIS. CLOUD-LAYER WIND PROFILES AND STEEP MID-LVL LAPSE RATES SUGGEST A THREAT FOR SVR HAIL WITH LONGER-LIVED UPDRAFTS 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. ...CORFIDI

SPC Severe Thunderstorm Watch 12 Status Reports
Thu, 24 Feb 2011 04:14:10 -0600

  STATUS FOR WATCH 0012 HAS NOT BEEN ISSUED YET

SPC Public Severe Weather Outlook
Thu, 24 Feb 2011 03:31:02 -0600

 PUBLIC SEVERE WEATHER OUTLOOK   NWS STORM PREDICTION CENTER NORMAN OK 0330 AM CST THU FEB 24 2011  ...SEVERE THUNDERSTORMS EXPECTED OVER PARTS OF THE LOWER MISSISSIPPI...LOWER TENNESSEE...AND LOWER OHIO VALLEYS LATER TODAY INTO TONIGHT...  THE NWS STORM PREDICTION CENTER IN NORMAN OK IS FORECASTING THE DEVELOPMENT OF TORNADOES...DAMAGING WINDS...AND HAIL OVER PARTS OF THE LOWER MISSISSIPPI AND LOWER TENNESSEE VALLEYS LATER TODAY INTO TONIGHT.  THE AREAS MOST LIKELY TO EXPERIENCE THIS ACTIVITY INCLUDE         MUCH OF ARKANSAS        WESTERN KENTUCKY        NORTHERN MISSISSIPPI        WESTERN AND MIDDLE TENNESSEE  SURROUNDING THE AREA OF GREATEST RISK...SEVERE STORMS ALSO MAY OCCUR FROM NORTHERN AND EASTERN TEXAS...AND CENTRAL AND EASTERN OKLAHOMA...INTO ALABAMA AND THE WESTERN SLOPES OF THE SOUTHERN AND CENTRAL APPALACHIANS  A POTENT JET STREAM DISTURBANCE NOW IN NEW MEXICO WILL SWEEP EAST-NORTHEAST ACROSS THE SOUTHERN PLAINS TODAY...AND INTO THE LOWER MISSISSIPPI AND OHIO VALLEYS TONIGHT AND EARLY FRIDAY.  AS THIS OCCURS...A SURFACE LOW NOW FORMING IN OKLAHOMA WILL STRENGTHEN AND ACCELERATE EAST-NORTHEAST INTO NORTHWEST ARKANSAS THIS AFTERNOON...BEFORE CONTINUING NORTHEAST ACROSS KENTUCKY AND SOUTHERN OHIO EARLY FRIDAY.  A BROAD CURRENT OF MOIST AND INCREASINGLY UNSTABLE AIR WILL SURGE NORTHWARD AHEAD OF THE LOW INTO MUCH OF SOUTH-CENTRAL AND SOUTHEASTERN UNITED STATES.

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