WWUS20 KWNS 131748
SEL7
SPC WW 131748
ILZ000-INZ000-MIZ000-OHZ000-LMZ000-140100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 267
NWS STORM PREDICTION CENTER NORMAN OK
1250 PM CDT FRI MAY 13 2005

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

       EASTERN ILLINOIS
       CENTRAL AND NORTHERN INDIANA
       SOUTHERN LOWER MICHIGAN
       NORTHWEST OHIO
       LAKE MICHIGAN

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL 800
PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
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 OF
KALAMAZOO MICHIGAN TO 35 MILES SOUTH SOUTHWEST OF BLOOMINGTON
INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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...SHOWERS/THUNDERSTORMS ARE INCREASING NEAR THE CHI
AREA...AND IN PLUME OF MOIST/UNSTABLE AIR OVER SOUTHERN IND.  WATCH
AREA SHOULD SEE INCREASING CONVECTION THROUGH THE NEXT SEVERAL
HOURS. COOL TEMPERATURES ALOFT...STEEP LAPSE RATES...AND AMPLE
INSTABILITY WILL PROMOTE A RISK OF LARGE HAIL AND DAMAGING WINDS IN
STRONGER CELLS.  AIRMASS IS ALSO LIKELY TO DESTABILIZE RAPIDLY
NORTHWARD INTO LOWER MI BY MID/LATE AFTERNOON.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 25035.


..HART

;424,0834 384,0851 384,0883 424,0871;