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 Tornado Watch 21
Sun, 27 Feb 2011 14:51:02 -0600

URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 21 NWS STORM PREDICTION CENTER NORMAN OK 250 PM CST SUN FEB 27 2011 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SMALL PART OF SOUTH CENTRAL AND SOUTHEAST KANSAS NORTH CENTRAL OKLAHOMA EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 250 PM UNTIL 900 PM CST. TORNADOES...HAIL TO 2 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 40 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH SOUTHWEST OF ALVA OKLAHOMA TO 25 MILES EAST SOUTHEAST OF CHANUTE KANSAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1). 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 20... DISCUSSION...VISIBLE IMAGERY SHOWS DEEPENING CUMULUS NEAR AND E OF THE TRIPLE POINT ACROSS N CENTRAL OK. A SEPARATE BAND OF HIGH-BASED CUMULUS IN NW OK DEMARCATES THE STRONG DRY SURGE AND SUGGESTS AN INCREASE IN LOW-LEVEL CONVERGENCE/ASCENT NEAR THE TRIPLE POINT IN THE NEXT COUPLE OF HOURS. NOW THAT SURFACE TEMPERATURES HAVE WARMED INTO THE 70S...THE CAP IS WEAKENING AND THUNDERSTORM DEVELOPMENT APPEARS PROBABLE BY 22-23Z. STRONG DEEP-LAYER SHEAR AND MLCAPE APPROACHING 1500 J/KG WILL SUPPORT SUPERCELLS CAPABLE OF PRODUCING LARGE HAIL. A COUPLE OF TORNADOES WILL BE POSSIBLE GIVEN 0-1 KM SRH AOA 200 M2/S2 AND THE POTENTIAL FOR STORMS TO MOVE NEAR/ALONG THE SURFACE WARM FRONT THIS EVENING. AVIATION...TORNADOES AND 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 25040. ...THOMPSON

SPC Tornado Watch 21 Status Reports
Sun, 27 Feb 2011 14:51:10 -0600

  STATUS FOR WATCH 0021 HAS NOT BEEN ISSUED YET

SPC Severe Thunderstorm Watch 20 Status Reports
Sun, 27 Feb 2011 14:49:04 -0600

  STATUS REPORT ON WW 20  THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.  ..SPC..02/27/11  ATTN...WFO...ICT...TOP...EAX...   STATUS REPORT FOR WS 20   SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS   KSC001-003-015-017-031-045-059-073-077-079-087-091-095-103-107- 111-113-115-121-127-139-155-173-177-191-197-207-209-272140-  KS  .    KANSAS COUNTIES INCLUDED ARE  ALLEN                ANDERSON            BUTLER               CHASE                COFFEY              DOUGLAS              FRANKLIN             GREENWOOD           HARPER               HARVEY               JEFFERSON           JOHNSON              KINGMAN              LEAVENWORTH         LINN                 LYON                 MCPHERSON           MARION               MIAMI                MORRIS              OSAGE                RENO                 SEDGWICK            SHAWNEE              SUMNER               WABAUNSEE           WOODSON              WYANDOTTE               MOC013-025-033-037-041-047-049-053-083-089-095-101-107-115-117- 121-159-165-175-177-195-272140-  MO  .    MISSOURI COUNTIES INCLUDED ARE  BATES                CALDWELL            CARROLL              CASS                 CHARITON            CLAY

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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