

143 

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

