

696 

WWUS20 KWNS 071711

SEL4

SPC WW 071711

INZ000-OHZ000-080000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 734

NWS STORM PREDICTION CENTER NORMAN OK

110 PM EDT SUN AUG 7 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND PORTIONS OF NORTHERN INDIANA

       WEST CENTRAL AND SOUTHWEST OHIO



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 110 PM UNTIL 800

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 90

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH

NORTHEAST OF MUNCIE INDIANA TO 35 MILES EAST SOUTHEAST OF

INDIANAPOLIS INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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...MCV CONTINUES AN EWD TREK ACROSS SRN LWR MI EARLY THIS

AFTN WITH A TRAILING SFC TROUGH EXTENDING SWWD INTO ECNTRL IL.

SFC-BASED TSTMS CONTINUE TO FORM AND BACKBUILD ALONG THIS BOUNDARY

AND WILL CONTINUE TO GROW UPSCALE INTO A LINEAR BAND WITH EMBEDDED

LOOPS.  ACTIVITY WILL LIKELY TRACK ESE INVOF AN OUTFLOW BOUNDARY

ALONG/N OF THE I-70 CORRIDOR AND ALONG NRN EDGE OF MORE ROBUST

INSTABILITY IN CNTRL/ECNTRL IND INTO WCNTRL/SWRN OH THROUGH THIS

EVENING.  DMGG WINDS APPEAR TO BE THE PRIMARY THREAT...ALTHOUGH

LARGE HAIL COULD ALSO OCCUR.



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 500. MEAN STORM

MOTION VECTOR 29035.





...RACY

