

464 

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

