URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 95 STORM PREDICTION CENTER NORMAN OK 710 PM CST SAT APR 5 2003 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF CENTRAL AND WESTERN OKLAHOMA EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 710 PM UNTIL MIDNIGHT 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 ALONG AND 70 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST NORTHWEST OF CLINTON OKLAHOMA TO 50 MILES NORTH NORTHEAST OF ARDMORE OKLAHOMA. 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 93...WW 94... DISCUSSION...STRONG WARM ADVECTION ACROSS OK WITH INCREASING ELEVATED INSTABILITY THIS EVENING. THUNDERSTORMS EXPECTED TO INTENSIFY RAPIDLY ACROSS SWRN OK AND SPREAD NEWD. PRIMARY THREAT WILL BE LARGE HAIL WITH POTENTIAL FOR SUPERCELLS IN SWRN OK FOR ENHANCED SEVERE THREAT. 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. ...HALES URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 97 STORM PREDICTION CENTER NORMAN OK 1135 PM CST SAT APR 5 2003 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF OKLAHOMA EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 1135 PM UNTIL 500 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 ALONG AND 80 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST NORTHWEST OF CLINTON OKLAHOMA TO 55 MILES SOUTHEAST OF MUSKOGEE OKLAHOMA. 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...THIS SEVERE THUNDERSTORM WATCH REPLACES SEVERE THUNDERSTORM WATCH NUMBER 95. WATCH NUMBER 95 WILL NOT BE IN EFFECT AFTER 1135 PM CST. CONTINUE...WW 94...WW 96... DISCUSSION...STRONG ADVECTION OF ELEVATED MOISTURE AND INSTABILITY UNDERWAY ACROSS OK. WITH THE VEERING SHEAR PROFILES AND VERTICAL MOTION WITH APPROACHING TROUGH AND WARM ADVECTION...THUNDERSTORMS EXPECTED TO CONTINUE AND INTENSIFY ACROSS MUCH OF OK. CONDITIONS FAVORABLE FOR ELEVATED SUPERCELLS WHICH WILL ENHANCE PRIMARILY THREAT OF LARGE HAIL. 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. ...HALES URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 98 STORM PREDICTION CENTER NORMAN OK 535 AM CDT SUN APR 6 2003 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF CENTRAL AND EASTERN OKLAHOMA EFFECTIVE THIS SUNDAY MORNING FROM 535 AM UNTIL 1000 AM CDT. HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 100 STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTH OF ARDMORE OKLAHOMA TO 10 MILES WEST NORTHWEST OF BARTLESVILLE OKLAHOMA. 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...THIS SEVERE THUNDERSTORM WATCH REPLACES SEVERE THUNDERSTORM WATCH NUMBER 97. WATCH NUMBER 97 WILL NOT BE IN EFFECT AFTER 535 AM CDT. DISCUSSION...THUNDERSTORMS ARE INTENSIFYING TO THE SW OF OKC ALONG A SECONDARY WARM FRONT ORIENTED ALONG THE I-44 CORRIDOR. LATEST RUC/ETA FORECAST SOUNDINGS SUGGEST ELEVATED CAPE OF 1500-2000 J/KG HAS SPREAD NWD TO CENTRAL OK...WHICH WILL COMBINE WITH STRONG SHEAR/WAA TO SUPPORT A THREAT OF SUPERCELLS WITH VERY LARGE HAIL FOR THE NEXT SEVERAL HOURS FROM CENTRAL INTO ERN OK. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 25030. ...THOMPSON URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 100 STORM PREDICTION CENTER NORMAN OK 945 AM CDT SUN APR 6 2003 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF WESTERN AND CENTRAL ARKANSAS EASTERN OKLAHOMA EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 945 AM UNTIL 300 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 ALONG AND 120 STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES EAST OF DURANT OKLAHOMA TO 35 MILES WEST NORTHWEST OF HARRISON ARKANSAS. 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...THIS SEVERE THUNDERSTORM WATCH REPLACES SEVERE THUNDERSTORM WATCH NUMBER 98. WATCH NUMBER 98 WILL NOT BE IN EFFECT AFTER 945 AM CDT. CONTINUE...WW 99... DISCUSSION...SCATTERED STRONG/SEVERE THUNDERSTORMS ARE EXPECTED TO CONTINUE ACROSS PARTS OF OK/AR THROUGH MUCH OF THE DAY...AS WARM ADVECTION AND DESTABILIZATION NORTH OF WARM FRONT AIDS ACTIVITY. LARGE HAIL IS EXPECTED TO BE THE MAIN THREAT. 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 24030. ...HART URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 101 STORM PREDICTION CENTER NORMAN OK 1030 AM CDT SUN APR 6 2003 THE STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SOUTHERN ARKANSAS NORTHERN LOUISIANA CENTRAL MISSISSIPPI EXTREME SOUTHEAST OKLAHOMA NORTHEAST TEXAS EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 1030 AM UNTIL 400 PM CDT. ...THIS IS A PARTICULARLY DANGEROUS SITUATION... DAMAGING TORNADOES...LARGE HAIL TO 3 INCHES IN DIAMETER... THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE TORNADO WATCH AREA IS ALONG AND 85 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES NORTH OF TYLER TEXAS TO 45 MILES EAST NORTHEAST OF JACKSON MISSISSIPPI. 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...THIS TORNADO WATCH REPLACES SEVERE THUNDERSTORM WATCH NUMBER 99. WATCH NUMBER 99 WILL NOT BE IN EFFECT AFTER 1030 AM CDT. CONTINUE...WW 100... DISCUSSION...CLUSTER OF SEVERE/SUPERCELL THUNDERSTORMS IS TRACKING EASTWARD ACROSS THE MS RIVER INTO CENTRAL MS. OTHER ACTIVITY IS DEVELOPING OVER NORTHEAST TX. VERY FAVORABLE VERTICAL SHEAR PROFILES /3KM HELICITY OF 300-500 M2/S2/ AND STRONG INSTABILITY /MUCAPE VALUES OF 2000-3000 J/KG/ WILL FAVOR THE DEVELOPMENT OF SCATTERED TORNADIC SUPERCELLS THROUGH THE AFTERNOON. POTENTIAL EXISTS FOR STRONG TORNADOES...AS WELL AS VERY LARGE HAIL AND DAMAGING WINDS. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR 26035. ...HART