279 WWUS20 KWNS 190203 SEL3 SPC WW 190203 ALZ000-GAZ000-190200- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH - NUMBER 53 NWS STORM PREDICTION CENTER NORMAN OK 1003 PM EDT MON MAR 18 2013 THE NWS STORM PREDICTION CENTER HAS CANCELLED TORNADO WATCH NUMBER 53 ISSUED AT 415 PM EDT FOR PORTIONS OF ALABAMA GEORGIA  013 WWUS20 KWNS 190203 SEL3 SPC WW 190203 ALZ000-GAZ000-190200- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH - NUMBER 53 NWS STORM PREDICTION CENTER NORMAN OK 1003 PM EDT MON MAR 18 2013 THE NWS STORM PREDICTION CENTER HAS CANCELLED TORNADO WATCH NUMBER 53 ISSUED AT 415 PM EDT FOR PORTIONS OF ALABAMA GEORGIA  050 WWUS20 KWNS 190303 SEL2 SPC WW 190303 ALZ000-ARZ000-GAZ000-LAZ000-MSZ000-TNZ000-190200- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH - NUMBER 52 NWS STORM PREDICTION CENTER NORMAN OK 1003 PM CDT MON MAR 18 2013 THE NWS STORM PREDICTION CENTER HAS CANCELLED SEVERE THUNDERSTORM WATCH NUMBER 52 ISSUED AT 130 PM CDT FOR PORTIONS OF ALABAMA ARKANSAS GEORGIA LOUISIANA MISSISSIPPI TENNESSEE  051 WWUS20 KWNS 190303 SEL4 SPC WW 190303 ALZ000-MSZ000-190300- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH - NUMBER 54 NWS STORM PREDICTION CENTER NORMAN OK 1003 PM CDT MON MAR 18 2013 THE NWS STORM PREDICTION CENTER HAS CANCELLED SEVERE THUNDERSTORM WATCH NUMBER 54 ISSUED AT 435 PM CDT FOR PORTIONS OF ALABAMA MISSISSIPPI  534 WWUS20 KWNS 190303 SEL4 SPC WW 190303 ALZ000-MSZ000-190300- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH - NUMBER 54 NWS STORM PREDICTION CENTER NORMAN OK 1003 PM CDT MON MAR 18 2013 THE NWS STORM PREDICTION CENTER HAS CANCELLED SEVERE THUNDERSTORM WATCH NUMBER 54 ISSUED AT 435 PM CDT FOR PORTIONS OF ALABAMA MISSISSIPPI  687 WWUS20 KWNS 190303 SEL2 SPC WW 190303 ALZ000-ARZ000-GAZ000-LAZ000-MSZ000-TNZ000-190200- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH - NUMBER 52 NWS STORM PREDICTION CENTER NORMAN OK 1003 PM CDT MON MAR 18 2013 THE NWS STORM PREDICTION CENTER HAS CANCELLED SEVERE THUNDERSTORM WATCH NUMBER 52 ISSUED AT 130 PM CDT FOR PORTIONS OF ALABAMA ARKANSAS GEORGIA LOUISIANA MISSISSIPPI TENNESSEE  430 WWUS20 KWNS 190503 SEL5 SPC WW 190503 GAZ000-SCZ000-190600- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH - NUMBER 55 NWS STORM PREDICTION CENTER NORMAN OK 103 AM EDT TUE MAR 19 2013 THE NWS STORM PREDICTION CENTER HAS CANCELLED SEVERE THUNDERSTORM WATCH NUMBER 55 ISSUED AT 730 PM EDT FOR PORTIONS OF GEORGIA SOUTH CAROLINA  761 WWUS20 KWNS 190503 SEL5 SPC WW 190503 GAZ000-SCZ000-190600- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH - NUMBER 55 NWS STORM PREDICTION CENTER NORMAN OK 103 AM EDT TUE MAR 19 2013 THE NWS STORM PREDICTION CENTER HAS CANCELLED SEVERE THUNDERSTORM WATCH NUMBER 55 ISSUED AT 730 PM EDT FOR PORTIONS OF GEORGIA SOUTH CAROLINA  977 WWUS20 KWNS 192248 SEL6 SPC WW 192248 TXZ000-200500- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 56 NWS STORM PREDICTION CENTER NORMAN OK 545 PM CDT TUE MAR 19 2013 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF PARTS OF CENTRAL AND SOUTHEAST TEXAS EFFECTIVE THIS TUESDAY AFTERNOON FROM 545 PM UNTIL MIDNIGHT 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 55 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 125 MILES WEST NORTHWEST OF AUSTIN TEXAS TO 30 MILES SOUTH SOUTHEAST OF COLLEGE STATION TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6). 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...THUNDERSTORM DEVELOPMENT IS UNDERWAY ACROSS CENTRAL TX NEAR THE INTERSECTION OF A DIFFUSE TROUGH/DRYLINE AND WNW-ESE ORIENTED SURFACE FRONT. THE AIR MASS S OF THE FRONT IS MODERATELY UNSTABLE WITH BOUNDARY LAYER DEWPOINTS IN THE MID-UPPER 50S AND TEMPERATURES IN THE LOW-MID 80S...WHICH IS DRIVING MLCAPE AROUND 1500 J/KG. MEANWHILE...WATER VAPOR IMAGERY SHOWS THE APPROACH OF A MID-UPPER JET STREAK MOVING FROM NM INTO W CENTRAL TX...AND ASCENT IN THE EXIT REGION OF THIS JET STREAK WILL OVERSPREAD CENTRAL TX THIS EVENING. THUS...THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE/INTENSITY THIS EVENING...IN AN ENVIRONMENT WITH SUFFICIENT DEEP-LAYER VERTICAL SHEAR FOR SUPERCELLS. LARGE HAIL WILL BE THE PRIMARY SEVERE THREAT WITH THE INITIAL SUPERCELLS...AND THE RISK FOR A FEW DAMAGING GUSTS WILL DEPEND MORE ON UPSCALE GROWTH INTO A CLUSTER THROUGH STORM MERGERS. 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 500. MEAN STORM MOTION VECTOR 30025. ...THOMPSON  369 WWUS20 KWNS 192248 SEL6 SPC WW 192248 TXZ000-200500- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 56 NWS STORM PREDICTION CENTER NORMAN OK 545 PM CDT TUE MAR 19 2013 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF PARTS OF CENTRAL AND SOUTHEAST TEXAS EFFECTIVE THIS TUESDAY AFTERNOON FROM 545 PM UNTIL MIDNIGHT 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 55 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 125 MILES WEST NORTHWEST OF AUSTIN TEXAS TO 30 MILES SOUTH SOUTHEAST OF COLLEGE STATION TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6). 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...THUNDERSTORM DEVELOPMENT IS UNDERWAY ACROSS CENTRAL TX NEAR THE INTERSECTION OF A DIFFUSE TROUGH/DRYLINE AND WNW-ESE ORIENTED SURFACE FRONT. THE AIR MASS S OF THE FRONT IS MODERATELY UNSTABLE WITH BOUNDARY LAYER DEWPOINTS IN THE MID-UPPER 50S AND TEMPERATURES IN THE LOW-MID 80S...WHICH IS DRIVING MLCAPE AROUND 1500 J/KG. MEANWHILE...WATER VAPOR IMAGERY SHOWS THE APPROACH OF A MID-UPPER JET STREAK MOVING FROM NM INTO W CENTRAL TX...AND ASCENT IN THE EXIT REGION OF THIS JET STREAK WILL OVERSPREAD CENTRAL TX THIS EVENING. THUS...THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE/INTENSITY THIS EVENING...IN AN ENVIRONMENT WITH SUFFICIENT DEEP-LAYER VERTICAL SHEAR FOR SUPERCELLS. LARGE HAIL WILL BE THE PRIMARY SEVERE THREAT WITH THE INITIAL SUPERCELLS...AND THE RISK FOR A FEW DAMAGING GUSTS WILL DEPEND MORE ON UPSCALE GROWTH INTO A CLUSTER THROUGH STORM MERGERS. 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 500. MEAN STORM MOTION VECTOR 30025. ...THOMPSON