WATCHES: Tornado Watch Number 478

WWUS20 KWNS 191554
SEL8
SPC WW 191554
INZ000-MIZ000-LMZ000-192300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 478
NWS STORM PREDICTION CENTER NORMAN OK
1150 AM EDT FRI JUN 19 2009

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

NORTHERN AND CENTRAL INDIANA
SOUTHWEST MICHIGAN
LAKE MICHIGAN

EFFECTIVE THIS FRIDAY MORNING AND EVENING FROM 1150 AM UNTIL 700
PM EDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST SOUTHWEST OF
VALPARAISO INDIANA TO 25 MILES SOUTHEAST OF FORT WAYNE INDIANA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU8).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...CONTINUE...WW 477...

DISCUSSION...STRONG/SEVERE STORMS ARE PROPAGATING EWD/ESEWD ACROSS
THE CHI ARE...AND NEW STORMS ARE DEVELOPING ALONG/NORTH OF AN
OUTFLOW BOUNDARY OVER EAST CENTRAL IL. THE ENVIRONMENT OVER
NRN/CNTRL INDIANA IS DESTABILIZING AS STRONG DIABATIC HEATING OCCURS
NORTH OF THE BOUNDARY. WINDS VEER AND INCREASE WITH HEIGHT WITH
40-50 KT DEEP LAYER SHEAR AND ENHANCED LOW-LEVEL SRH ASSOCIATED WITH
BACKED NEAR-SURFACE FLOW NORTH OF THE BOUNDARY...PROVIDING A
FAVORABLE SUPERCELL ENVIRONMENT. STORMS ARE EXPECTED TO CONTINUE
INTENSIFYING INTO THE AFTERNOON HOURS...WITH STRONGER STORMS CAPABLE
OF PRODUCING DAMAGING WINDS...HAIL...AND A FEW TORNADOES.

AVIATION...TORNADOES AND 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
550. MEAN STORM MOTION VECTOR 28035.

...WEISS

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