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

Sunday, February 27, 2011

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

SPC Severe Thunderstorm Watch 20
Sun, 27 Feb 2011 13:15:02 -0600

URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 20 NWS STORM PREDICTION CENTER NORMAN OK 115 PM CST SUN FEB 27 2011 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTH CENTRAL INTO EAST CENTRAL KANSAS PARTS OF WESTERN AND NORTHERN MISSOURI EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 115 PM UNTIL 900 PM 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 45 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 70 MILES NORTHEAST OF KNOB NOSTER MISSOURI TO 40 MILES SOUTHWEST OF HUTCHINSON KANSAS. 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...ELEVATED THUNDERSTORMS ARE BEGINNING TO INTENSIFY OVER S CENTRAL KS...IMMEDIATELY N OF A SURFACE WARM FRONT. STEEP LAPSE RATES AND A FEED OF MOISTURE ABOVE THE COOL AIR MASS WILL SUPPORT MUCAPE ON THE ORDER OF 1500 J/KG...WHILE DEEP-LAYER VERTICAL SHEAR WILL BE FAVORABLE FOR EMBEDDED SUPERCELLS. LARGE HAIL WILL BE THE MAIN SEVERE THREAT...THOUGH AREAS IMMEDIATELY S OF THE WATCH AREA WILL BE MONITORED FOR A POSSIBLE TORNADO THREAT WITH STORMS ON THE WARM FRONT A LITTLE LATER THIS AFTERNOON. 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 24040. ...THOMPSON

SPC Severe Thunderstorm Watch 20 Status Reports
Sun, 27 Feb 2011 13:15:10 -0600

  STATUS FOR WATCH 0020 HAS NOT BEEN ISSUED YET

SPC Public Severe Weather Outlook
Sun, 27 Feb 2011 11:23:02 -0600

 PUBLIC SEVERE WEATHER OUTLOOK   NWS STORM PREDICTION CENTER NORMAN OK 1121 AM CST SUN FEB 27 2011  ...SEVERE THUNDERSTORMS EXPECTED OVER PARTS OF ARKANSAS NORTHEASTWARD TO THE LOWER OHIO VALLEY THIS AFTERNOON AND TONIGHT...  THE NWS STORM PREDICTION CENTER IN NORMAN OK IS FORECASTING THE DEVELOPMENT OF A FEW STRONG TORNADOES OVER PARTS OF ARKANSAS NORTHEASTWARD TO THE LOWER OHIO VALLEY THIS AFTERNOON AND TONIGHT.  THE AREAS MOST LIKELY TO EXPERIENCE THIS ACTIVITY INCLUDE         CENTRAL AND NORTHEAST ARKANSAS        SOUTHERN ILLINOIS        EXTREME SOUTHWEST INDIANA        WESTERN KENTUCKY        SOUTHEAST MISSOURI        NORTHWEST TENNESSEE  ELSEWHERE...SEVERE STORMS ARE ALSO POSSIBLE FROM PARTS OF KANSAS...OKLAHOMA...AND NORTHEAST TEXAS TO THE OHIO VALLEY.  A STRONG UPPER LEVEL STORM SYSTEM OVER ARIZONA AND NEW MEXICO AS OF LATE MORNING WILL MOVE EAST-NORTHEASTWARD OVER KANSAS AND OKLAHOMA THIS EVENING...AND CONTINUING OVER ARKANSAS AND MISSOURI OVERNIGHT.  THE UPPER LEVEL SYSTEM WILL BE PRECEDED BY A SURFACE LOW PRESSURE CENTER WHICH WILL DEVELOP EASTWARD ALONG THE KANSAS AND OKLAHOMA BORDER THIS EVENING...AND THEN NORTHEASTWARD INTO THE OHIO VALLEY OVERNIGHT.  A MOIST AND UNSTABLE AIR MASS IS SPREADING NORTHWARD ACROSS THE SOUTHERN PLAINS AND LOWER MISSISSIPPI VALLEY IN ADVANCE OF THIS STORM SYSTEM...AND THIS WILL SET THE STAGE FOR SEVERAL ROUNDS OF SEVERE THUNDERSTORMS BEGINNING THIS AFTERNOON AND CONTINUING INTO TONIGHT.    THE MOST SIGNIFICANT THREAT FOR TORNADOES SHOULD BEGIN LATER THIS AFTERNOON ACROSS THE NORTHEAST ARKANSAS AND WESTERN TENNESSEE

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