

639 

WWUS20 KWNS 020001

SEL7

SPC WW 020001

ARZ000-MSZ000-TNZ000-020600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 607

NWS STORM PREDICTION CENTER NORMAN OK

700 PM CDT SAT SEP 1 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR EASTERN ARKANSAS

       NORTHERN MISSISSIPPI

       WESTERN TENNESSEE



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 700 PM

UNTIL 100 AM CDT.



HAIL TO 1 INCH 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 55 MILES WEST

SOUTHWEST OF MEMPHIS TENNESSEE TO 50 MILES NORTHEAST OF TUPELO

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 602...WW 603...WW

604...WW 605...WW 606...



DISCUSSION...A LINEAR BAND OF TSTMS HAS EVOLVED THIS EVENING W OF

MEMPHIS IN ADVANCE OF A VORTICITY MAXIMUM MOVING THROUGH THE OZARK

PLATEAU AND WITHIN A WARM AND MOIST ENVIRONMENT WITH MLCAPE OF

1000-1500 J/KG.  GIVEN THE MODERATELY STRONG WIND FIELD IN

PLACE...SETUP WILL REMAIN SUPPORTIVE OF THE EWD/SEWD CONTINUATION OF

STORMS WITH THE PRIMARY HAZARD BEING DAMAGING WINDS.



AVIATION...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 27035.





...MEAD

