

899 

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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