WATCHES: Severe Thunderstorm Watch Number 474

WWUS20 KWNS 062000
SEL4
SPC WW 062000
ALZ000-MSZ000-TNZ000-070200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 474
NWS STORM PREDICTION CENTER NORMAN OK
300 PM CDT FRI JUL 6 2012

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

NORTHWEST ALABAMA
NORTHERN MISSISSIPPI
WESTERN AND MIDDLE TENNESSEE

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 300 PM UNTIL 900
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 45 MILES WEST
NORTHWEST OF NASHVILLE TENNESSEE TO 35 MILES SOUTH SOUTHEAST OF
OXFORD MISSISSIPPI. 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.

DISCUSSION...STRONG/SEVERE STORMS APPEAR TO BE ORGANIZING IN A BAND
FROM PARTS OF TN INTO NWRN AL/NERN MS...ALONG THE LEADING EDGE OF
MID/UPPER LEVEL DRYING EVIDENT IN WATER VAPOR IMAGERY. LOW LEVEL
AIR MASS IS HOT WITH TEMPERATURES NEAR 100...AND WITH DEW POINTS IN
THE 65-70 RANGE...STRONG INSTABILITY COUPLED WITH A DEEP
SURFACE-BASED WELL-MIXED LAYER WILL ENHANCE POTENTIAL FOR DAMAGING
WIND GUSTS. ACTIVITY IS EXPECTED TO SPREAD SWD/SWWD THROUGH THE
EVENING BEFORE GRADUALLY WEAKENING AROUND SUNSET.

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 550. MEAN STORM
MOTION VECTOR 04020.


...WEISS

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