

778 

WWUS20 KWNS 222132

SEL2

SPC WW 222132

INZ000-MIZ000-LMZ000-230500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 332

NWS STORM PREDICTION CENTER NORMAN OK

535 PM EDT SUN MAY 22 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN INDIANA

       SOUTHWEST LOWER MICHIGAN

       LAKE MICHIGAN



EFFECTIVE THIS SUNDAY AFTERNOON AND MONDAY MORNING FROM 535 PM

UNTIL 100 AM EDT.



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 70

STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES NORTH

NORTHEAST OF MUSKEGON MICHIGAN TO 35 MILES EAST OF LAFAYETTE

INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 322...WW 323...WW

324...WW 325...WW 326...WW 327...WW 328...WW 329...WW 330...WW

331...



DISCUSSION...LINEAR MCS OVER NE IL/NW INDIANA WILL LIKELY PERSIST

WILL MOVING EWD INTO NRN INDIANA AND SW LOWER MI THROUGH THE

EVENING.  THE DOWNSTREAM ENVIRONMENT IS CHARACTERIZED BY MLCAPE OF

2000-3000 J/KG AND EFFECTIVE BULK SHEAR OF 30-40 KT...WHICH WILL

MAINTAIN A RISK FOR EMBEDDED BOWS AND SUPERCELL STRUCTURES.  THE

PRIMARILY LINEAR NATURE OF THE CONVECTION...AND LACK OF PRE-EXISTING

SURFACE BOUNDARIES...SUGGEST THAT DAMAGING WINDS AND LARGE HAIL WILL

BE THE MAIN SEVERE THREATS FOR THE NEXT SEVERAL HOURS.



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 500. MEAN STORM

MOTION VECTOR 26030.





...THOMPSON

