URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 123
NWS STORM PREDICTION CENTER NORMAN OK
935 AM EDT THU APR 18 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  EASTERN ILLINOIS
  CENTRAL AND EASTERN INDIANA
  SOUTHERN LOWER MICHIGAN
  NORTHWEST OHIO OHIO
  LAKE MICHIGAN

* EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 935 AM UNTIL
  500 PM EDT.

...THIS IS A PARTICULARLY DANGEROUS SITUATION...

* PRIMARY THREATS INCLUDE...
  SEVERAL INTENSE TORNADOES LIKELY
  SEVERAL SIGNIFICANT DAMAGING WIND GUSTS TO 80 MPH POSSIBLE
  A FEW VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 65 MILES EAST NORTHEAST OF
SOUTH BEND INDIANA TO 60 MILES SOUTH SOUTHWEST OF TERRE HAUTE
INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 122...

DISCUSSION...DISCRETE SUPERCELL DEVELOPMENT IS POSSIBLE AHEAD OF THE
INTENSIFYING PRE-FRONTAL SQUALL LINE THAT WILL RAPIDLY MOVE
NORTHEASTWARD ACROSS THE WATCH AREA THIS MORNING.  GIVEN THE
STRENGTH OF THE LOW-LEVEL SHEAR...A FEW TORNADOES ARE
POSSIBLE...BOTH IN SUPERCELLS AND WITHIN MESO VORTICES EMBEDDED
WITHIN THE LINE.  ACTIVITY MAY BE CAPABLE OF PRODUCING STRONG TO
LOCALLY EXTREME WIND DAMAGE...REGARDLESS OF WHETHER TORNADIC OR
STRAIGHT LINE IN NATURE,

AVIATION...TORNADOES AND 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 24050.


...KERR