WATCHES: Severe Thunderstorm Watch Number 433

WWUS20 KWNS 290023
SEL3
SPC WW 290023
INZ000-290400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 433
NWS STORM PREDICTION CENTER NORMAN OK
725 PM CDT THU JUN 28 2012

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

NORTHWEST INDIANA

EFFECTIVE THIS THURSDAY EVENING FROM 725 PM UNTIL 1100 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 20
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF
VALPARAISO INDIANA TO 35 MILES EAST SOUTHEAST OF VALPARAISO
INDIANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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...AN ISOLATED INTENSE THUNDERSTORM HAS FORMED ALONG THE
LAKE BREEZE NEAR CHI. THIS STORM IS EXPECTED TO TRACK
EAST-SOUTHEASTWARD INTO NORTHWEST IND DURING THE NEXT HOUR OR TWO.
DESPITE THE STORMS LIMITED AREAL COVERAGE...EXTREME INSTABILITY AND
FAVORABLE EFFECTIVE SHEAR VALUES SUGGEST THE POTENTIAL FOR SUPERCELL
STRUCTURES. LARGE HAIL AND DAMAGING WINDS APPEAR TO BE THE MAIN
THREAT...ALTHOUGH A BRIEF TORNADO CANNOT BE RULED OUT.

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 600. MEAN STORM
MOTION VECTOR 29025.


...HART

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