URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 546 NWS STORM PREDICTION CENTER NORMAN OK 1020 AM CDT FRI JUL 20 2007 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHERN AND CENTRAL ALABAMA WESTERN GEORGIA EFFECTIVE THIS FRIDAY MORNING AND EVENING FROM 1020 AM UNTIL 600 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 85 STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH OF BIRMINGHAM ALABAMA TO 35 MILES SOUTH OF AUBURN ALABAMA. 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 PRODUCE TORNADOES.
DISCUSSION...LINE OF STRONG/SEVERE STORMS CONTINUE MOVING SSEWD AT AROUND 30 KT. ACTIVITY IS MOVING INTO AN INSTABILITY AXIS WHERE MORNING HEATING HAS BROUGHT ML PARCEL CAPE TO BETWEEN 1500-2000 J/KG. ANALYSIS OF 13Z RUC SOUNDINGS SUPPORT STEEP LAPSE RATES TO 3KM ARE AROUND 8C/KM WHICH INDICATES POTENTIAL FOR DAMAGING WINDS AND 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 30030.
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