SEL8 URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 328 NWS STORM PREDICTION CENTER NORMAN OK 100 PM CDT THU MAY 31 2012 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EASTERN ARKANSAS THE MISSOURI BOOTHEEL NORTHERN AND CENTRAL MISSISSIPPI WESTERN TENNESSEE EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 100 PM UNTIL 800 PM CDT. 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 EAST AND WEST OF A LINE FROM 50 MILES SOUTH SOUTHWEST OF GREENWOOD MISSISSIPPI TO 30 MILES NORTH OF DYERSBURG TENNESSEE. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8). 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. OTHER WATCH INFORMATION...CONTINUE...WW 327... DISCUSSION...STORMS ARE BEGINNING TO DEVELOP IN ADVANCE OF A NEWD MOVING MCV OVER SRN AR...WHERE A LOW LEVEL THERMAL/MOISTURE AXIS HAS BECOME ESTABLISHED NEAR THE MS RIVER. THE AIR MASS IS UNSTABLE WITH MLCAPE OF 2000-2500 J/KG...AND SUFFICIENT FLOW ALOFT AND VERTICAL SHEAR EXISTS TO SUPPORT MULTICELL STORM ORGANIZATION. STEEP LAPSE RATES IN THE LOW-MID LEVELS WILL ENHANCE THREAT FOR LARGE HAIL AND DAMAGING WIND GUSTS WITH STRONGER CELLS INTO THE EARLY EVENING HOURS AS STORMS GRADUALLY DEVELOP NWD THROUGH THE MID SOUTH REGION. 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 550. MEAN STORM MOTION VECTOR 23020.
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