WATCHES: Severe Thunderstorm Watch Number 275

WWUS20 KWNS 151755
SEL5
SPC WW 151755
ILZ000-INZ000-MIZ000-OHZ000-LEZ000-LHZ000-160200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 275
NWS STORM PREDICTION CENTER NORMAN OK
155 PM EDT TUE MAY 15 2007

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

NORTHEASTERN ILLINOIS
NORTHERN INTO WEST CENTRAL INDIANA
SOUTHERN AND CENTRAL LOWER MICHIGAN
NORTHWESTERN OHIO
LAKE ERIE
LAKE HURON

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 155 PM UNTIL
1000 PM 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 80
STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES SOUTHEAST OF
DANVILLE ILLINOIS TO 5 MILES EAST NORTHEAST OF BAD AXE MICHIGAN.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU5).

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 274...

DISCUSSION...BOUNDARY LAYER MIXING AND INCREASED ASCENT WITHIN
MARGINAL TO MODERATELY UNSTABLE AIR MASS WILL SUPPORT SCATTERED TO
NUMEROUS THUNDERSTORMS THIS AFTERNOON AND EVENING ACROSS WW. SHEAR
WILL REMAIN STRONGEST INTO NRN IND AND MI WHERE MORE ORGANIZED
STORMS WILL LIKELY EVOLVE. HOWEVER...LARGE HAIL AND DAMAGING WINDS
WILL BE COMMON WITH STRONGER CORES ACROSS WW THROUGH THIS EVENING.

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 26025.

..EVANS

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