Sunday, April 19, 2009

Thunderstorm Watch - North Alabama


   URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 174
NWS STORM PREDICTION CENTER NORMAN OK
430 PM CDT SUN APR 19 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

PARTS OF NORTHERN ALABAMA
SOUTHERN PORTION OF MIDDLE TENNESSEE

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 430 PM UNTIL
1000 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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES NORTHWEST
OF MUSCLE SHOALS ALABAMA TO 70 MILES EAST NORTHEAST OF HUNTSVILLE
ALABAMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

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 171...WW 172...WW 173...

DISCUSSION...STRONG/SEVERE THUNDERSTORMS HAVE DEVELOPED NRN MS AHEAD
OF UPPER TROUGH. WITH 50KT OF DEEP LAYER SHEAR AND 7C/KM LAPSE
RATES...SUFFICIENT INSTABILITY TO SUPPORT SEVERE THUNDERSTORMS
CONTINUING E/NE ACROSS THE WATCH AREA THIS EVENING. PRIMARY THREAT
WILL BE LOCAL DAMAGING WINDS AND 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

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