

932 

WWUS20 KWNS 310248

SEL9

SPC WW 310248

ARZ000-MSZ000-311000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 599

NWS STORM PREDICTION CENTER NORMAN OK

945 PM CDT THU AUG 30 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       FAR EASTERN ARKANSAS

       MISSISSIPPI



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 945 PM

UNTIL 500 AM CDT.



TORNADOES...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS

LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHEAST OF

GREENWOOD MISSISSIPPI TO 20 MILES SOUTHEAST OF MC COMB

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 598...



DISCUSSION...SINCE AROUND 01Z...A RENEWAL IN DEEP CONVECTION HAS

OCCURRED FROM ALONG THE I-20 CORRIDOR BETWEEN JAN AND MEI SWD TO E

AND S OF MCB...PRESUMABLY OWING TO AN INCREASE IN LOW-LEVEL

CONFLUENCE PER AREA VAD DATA.  INSTABILITY IS WEAK BUT SUFFICIENT TO

SUPPORT CONVECTIVE ELEMENTS DEEP ENOUGH TO PRODUCE LIGHTNING.  GIVEN

THE PRESENCE OF LARGE...CLOCKWISE-CURVED HODOGRAPHS WITH 0-1 KM SRH

OF 200-350+ M2/S2...SETUP WILL REMAIN SUPPORTIVE OF EMBEDDED

SUPERCELL STRUCTURES CAPABLE OF BRIEF TORNADOES.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH EXTREME

TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI

WITH MAXIMUM TOPS TO 400. MEAN STORM MOTION VECTOR 18035.





...MEAD

