WATCHES: Tornado Watch Number 599

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

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