WATCHES: Severe Thunderstorm Watch Number 558

WWUS20 KWNS 261927
SEL8
SPC WW 261927
MOZ000-270300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 558
NWS STORM PREDICTION CENTER NORMAN OK
225 PM CDT SUN JUN 26 2011

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

SOUTHEAST MISSOURI

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 225 PM UNTIL
1000 PM CDT.

HAIL TO 2.5 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 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES WEST
NORTHWEST OF WEST PLAINS MISSOURI TO 40 MILES SOUTH SOUTHEAST OF
CAPE GIRARDEAU MISSOURI. FOR A COMPLETE DEPICTION OF THE WATCH
SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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 555...WW 556...WW 557...

DISCUSSION...A SHORT LINE SEGMENT HAS RECENTLY INTENSIFIED OVER
S-CNTRL MO WITHIN AN EXTREMELY UNSTABLE AIR MASS WITH MLCAPE VALUES
OF 4000-4500 J/KG. CURRENT SGF VWP SHOWS A VERTICALLY VEERING WIND
PROFILE WITH 40-45 KT NWLY FLOW IN THE MIDLEVELS WHICH IS MORE THAN
SUFFICIENT TO SUPPORT FURTHER INTENSIFICATION OF ONGOING STORMS.
EXPECT ACTIVITY TO CONTINUE ESEWD...PERHAPS ACCELERATING...BEFORE
ENCOUNTERING RESIDUAL OUTFLOW BOUNDARY ALIGNED IN NNW-SSE FASHION
OVER FAR SERN MO. AT THIS POINT... STORMS MAY ATTEMPT TO PROPAGATE
MORE SEWD. WHILE A TORNADO IS POSSIBLE...DAMAGING WINDS AND LARGE
HAIL APPEAR TO BE THE PRIMARY HAZARDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 28030.

...MEAD

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