

896 

WWUS20 KWNS 311802

SEL8

SPC WW 311802

ARZ000-MOZ000-MSZ000-TNZ000-010100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 328

NWS STORM PREDICTION CENTER NORMAN OK

100 PM CDT THU MAY 31 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN ARKANSAS

       THE MISSOURI BOOTHEEL

       NORTHERN AND CENTRAL MISSISSIPPI

       WESTERN TENNESSEE



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 100 PM UNTIL

800 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES SOUTH

SOUTHWEST OF GREENWOOD MISSISSIPPI TO 30 MILES NORTH OF DYERSBURG

TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 327...



DISCUSSION...STORMS ARE BEGINNING TO DEVELOP IN ADVANCE OF A NEWD

MOVING MCV OVER SRN AR...WHERE A LOW LEVEL THERMAL/MOISTURE AXIS HAS

BECOME ESTABLISHED NEAR THE MS RIVER.  THE AIR MASS IS UNSTABLE WITH

MLCAPE OF 2000-2500 J/KG...AND SUFFICIENT FLOW ALOFT AND VERTICAL

SHEAR EXISTS TO SUPPORT MULTICELL STORM ORGANIZATION.  STEEP LAPSE

RATES IN THE LOW-MID LEVELS WILL ENHANCE THREAT FOR LARGE HAIL AND

DAMAGING WIND GUSTS WITH STRONGER CELLS INTO THE EARLY EVENING HOURS

AS STORMS GRADUALLY DEVELOP NWD THROUGH THE MID SOUTH REGION.



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 23020.





...WEISS

