WATCHES: Severe Thunderstorm Watch Number 455

WWUS20 KWNS 112040
SEL5
SPC WW 112040
ARZ000-ILZ000-KSZ000-KYZ000-MOZ000-TNZ000-120400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 455
NWS STORM PREDICTION CENTER NORMAN OK
340 PM CDT SUN JUL 11 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

FAR NORTHEAST ARKANSAS
SOUTHERN ILLINOIS
FAR EASTERN KANSAS
FAR WESTERN KENTUCKY
CENTRAL AND SOUTHERN MISSOURI
NORTHWEST TENNESSEE

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 340 PM UNTIL
1100 PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTH
NORTHWEST OF JOPLIN MISSOURI TO 35 MILES EAST SOUTHEAST OF
PADUCAH KENTUCKY. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).

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...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 450...TORNADO WATCH NUMBER 451.
WATCH NUMBER 450 451 WILL NOT BE IN EFFECT AFTER 340 PM CDT.
CONTINUE...WW 452...WW 453...WW 454...

DISCUSSION...EVOLVING BOW ECHO IS EXPECTED TO CONTINUE SEWD AT 40-45
KT ALONG SRN FRINGE OF MIDLEVEL TROUGH PROGRESSING TOWARD THE MID MS
VALLEY. AMBIENT INFLOW AIR MASS IS HOT AND VERY MOIST WITH MLCAPE
OF 2000-2500 J/KG. WHEN COUPLED WITH 40-50 KT OF DEEP WNWLY
SHEAR...ENVIRONMENT WILL REMAIN SUPPORTIVE OF EMBEDDED SUPERCELL AND
BOWING STRUCTURES WITH THE PRIMARY HAZARDS BEING DESTRUCTIVE WINDS
AND HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 29040.

...MEAD

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