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186 

WWUS20 KWNS 201746

SEL6

SPC WW 201746

ALZ000-ARZ000-MOZ000-MSZ000-TNZ000-210100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 196

NWS STORM PREDICTION CENTER NORMAN OK

1245 PM CDT THU MAY 20 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST ALABAMA

       FAR NORTHEAST ARKANSAS

       MISSOURI BOOTHEEL

       NORTHERN MISSISSIPPI

       WESTERN TENNESSEE



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1245 PM UNTIL

800 PM CDT.



HAIL TO 1.5 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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTH OF

OXFORD MISSISSIPPI TO 80 MILES EAST NORTHEAST OF DYERSBURG

TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 194...WW 195...



DISCUSSION...TSTMS ARE EXPECTED TO INTENSIFY THIS AFTERNOON ALONG

PRE-FRONTAL CONFLUENCE ZONE AND DEEPER CONVERGENCE BOUNDARY MOVING

ACROSS THE MS RIVER.  THE COMBINATION OF A MOISTENING/DESTABILIZING

AIR MASS AND AROUND 40 KT OF DEEP SWLY SHEAR SHOULD SUPPORT THE

DEVELOPMENT OF ORGANIZED SEVERE STORMS CAPABLE OF MAINLY DAMAGING

WINDS AND HAIL.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 26030.





...MEAD

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