

062 

WWUS20 KWNS 312321

SEL4

SPC WW 312321

INZ000-010400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 264

NWS STORM PREDICTION CENTER NORMAN OK

720 PM EDT FRI MAY 31 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHERN INDIANA



* EFFECTIVE THIS FRIDAY NIGHT FROM 720 PM UNTIL MIDNIGHT EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTH OF

VALPARAISO INDIANA TO 25 MILES EAST NORTHEAST OF FORT WAYNE

INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 260...WW 261...WW

262...WW 263...



DISCUSSION...A SMALL STORM CLUSTER NOW EXHIBITING A BOW ECHO

STRUCTURE IN RADAR REFLECTIVITIES APPEARS TO BE ON THE LEADING EDGE

OF A BELT OF 30-40+ KT DEEP LAYER MEAN FLOW...AND MAY MAINTAIN

INTENSITY AT LEAST ANOTHER FEW HOURS AS IT PROGRESSES ACROSS THE

REMAINDER OF NORTHERN INDIANA.  A FEW POTENTIALLY DAMAGING WIND

GUSTS PROBABLY WILL ACCOMPANY THIS ACTIVITY...ALONG WITH PERHAPS

SOME HAIL...BEFORE IT WEAKENS LATER THIS EVENING.



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 450. MEAN STORM

MOTION VECTOR 25035.





...KERR

