WATCHES: Severe Thunderstorm Watch Number 547

WWUS20 KWNS 041914
SEL7
SPC WW 041914
ARZ000-ILZ000-KYZ000-MOZ000-TNZ000-050100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 547
NWS STORM PREDICTION CENTER NORMAN OK
210 PM CDT SAT JUL 4 2009

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

NORTHEAST ARKANSAS
SOUTHERN ILLINOIS
WESTERN KENTUCKY
SOUTHEAST MISSOURI
NORTHWEST TENNESSEE

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 210 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 NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF
POPLAR BLUFF MISSOURI TO 30 MILES NORTHEAST OF PADUCAH KENTUCKY.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).

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 545...WW 546...

DISCUSSION...WARM SECTOR CONTINUES TO GRADUALLY DESTABILIZE AHEAD OF
SURFACE LOW ACROSS NRN MO AND CONVECTIVELY ENHANCED OUTFLOW MOVING
EAST ACROSS NRN AR. MLCAPE VALUES AOA 1000 J/KG ARE EXPECTED TO AID
TSTM UPDRAFT INTENSIFICATION AS LARGE SCALE LIFT/ASCENT IS
MAINTAINED AHEAD OF SFC LOW AND WARM FRONT THROUGH THE AFTERNOON.
DEEP-LAYER EFFECTIVE SHEAR ON THE ORDER OF 30-40KT WILL LIKELY
CONTRIBUTE TO PERSISTENT ROTATING UPDRAFTS CAPABLE OF PRODUCING HAIL
AND LOCALLY STRONGER WIND GUSTS. TORNADO POTENTIAL MAY EXIST WITH
ROTATING STORMS ON OR CROSSING THE WARM FRONT INVOF MS/OH RIVER
CONFLUENCE NEXT FEW HOURS. THIS POTENTIAL APPEARS TOO LIMITED IN
SCOPE TO SUPPORT TORNADO WATCH BUT STORMS DEVELOPING OR MOVING INTO
THIS AREA SHOULD BE MONITORED CLOSELY FOR STRONGER LOW LEVEL
ROTATION.

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 450. MEAN STORM
MOTION VECTOR 26030.

...CARBIN

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