SEL4
URGENT – IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 734
NWS STORM PREDICTION CENTER NORMAN OK
1150 AM CDT WED OCT 27 2010
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
CENTRAL ALABAMA
NORTHERN AND CENTRAL GEORGIA
EAST-CENTRAL MISSISSIPPI
EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1150 AM UNTIL
700 PM CDT.
TORNADOES…HAIL TO 1 INCH IN DIAMETER…THUNDERSTORM WIND GUSTS
TO 70 MPH…AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 45 STATUTE
MILES EITHER SIDE OF A LINE FROM 70 MILES SOUTHWEST OF TUSCALOOSA
ALABAMA TO 25 MILES EAST OF ATHENS GEORGIA. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU4).
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 732…WW 733…
DISCUSSION…AN UPSWING IN TSTM ACTIVITY IS ANTICIPATED THIS
AFTERNOON ALONG AND S/SE OF SYNOPTIC BOUNDARY WITHIN A WARM…HUMID
AIR MASS WHERE MLCAPE WILL APPROACH 1000-1500 J/KG. REGION WILL
REMAIN ALONG SERN PERIPHERY OF STRONGEST CYCLONIC MID AND HIGH-LEVEL
FLOW WITH SUFFICIENT /35-45 KT/ DEEP-LAYER SHEAR TO SUPPORT
SUPERCELLS. STEEPENING LOW-LEVEL LAPSE RATES…A CORRIDOR OF
LOCALLY HIGHER VORTICITY INVOF FRONT AND MAINTENANCE OF SWRN
EXTENSION OF SWLY 30-40 KT LLJ ACROSS AREA INDICATE A RISK FOR A
COUPLE OF TORNADOES IN ADDITION TO LOCALLY DAMAGING WIND GUSTS.
AVIATION…TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 26030.
