WATCHES: Severe Thunderstorm Watch Number 408

WWUS20 KWNS 311933
SEL8
SPC WW 311933
ILZ000-INZ000-MIZ000-OHZ000-LEZ000-LHZ000-LMZ000-010400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 408
NWS STORM PREDICTION CENTER NORMAN OK
335 PM EDT TUE MAY 31 2011

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

CENTRAL AND NORTHEAST ILLINOIS
NORTHERN INDIANA
CENTRAL AND SOUTHERN LOWER MICHIGAN
NORTHWEST OHIO
LAKE ERIE
LAKE HURON
LAKE MICHIGAN

EFFECTIVE THIS TUESDAY AFTERNOON FROM 335 PM UNTIL MIDNIGHT EDT.

HAIL TO 2 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 110
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH
NORTHWEST OF SAGINAW MICHIGAN TO 35 MILES SOUTHEAST OF CHAMPAIGN
ILLINOIS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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 407...

DISCUSSION...SCATTERED THUNDERSTORMS ARE BEGINNING TO DEVELOP ALONG
AND AHEAD OF A COLD FRONT OVER IL. THESE STORMS ARE EXPECTED TO
INCREASE IN COVERAGE AND TRACK RAPIDLY NORTHEASTWARD ACROSS THE
WATCH AREA THIS AFTERNOON AND EVENING. STEEP LOW LEVEL LAPSE RATES
AND STRONG WINDS ALOFT WILL PROMOTE A RISK OF DAMAGING WINDS...WHILE
A VERY UNSTABLE AIR MASS SUGGESTS A RISK OF LARGE HAIL.

AVIATION...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 500. MEAN STORM
MOTION VECTOR 24040.

...HART

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