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WWUS20 KWNS 301907

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 208

NWS STORM PREDICTION CENTER NORMAN OK

305 PM EDT MON APR 30 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       INDIANA

       WESTERN AND NORTHERN KENTUCKY



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 305 PM UNTIL

1000 PM EDT.



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 65

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTH

SOUTHWEST OF OWENSBORO KENTUCKY TO 45 MILES NORTH NORTHWEST OF

MUNCIE INDIANA.  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.



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY THIS AFTERNOON AHEAD OF RESIDUAL OUTFLOW BOUNDARY AND

SYNOPTIC COLD FRONT AS DEEP ASCENT IS ENHANCED BY SHORTWAVE TROUGH

MOVING THROUGH THE MID-MS VALLEY.  DAYTIME HEATING IN CONJUNCTION

WITH THE NEWD FLUX OF AN INCREASINGLY MOIST BOUNDARY LAYER SHOULD

CONTRIBUTE TO FURTHER AIR MASS DESTABILIZATION BY LATE AFTERNOON

WITH MLCAPE VALUES APPROACHING 1000-2000 J/KG.  WHEN COUPLED WITH

40-50 KT OF DEEP SWLY SHEAR...SETUP WILL SUPPORT SUPERCELLS AND

BOWING STRUCTURES CAPABLE OF DAMAGING WINDS AND SEVERE 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 450. MEAN STORM

MOTION VECTOR 24030.





...MEAD

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