WATCHES: Severe Thunderstorm Watch Number 407

WWUS20 KWNS 311754
SEL7
SPC WW 311754
MIZ000-WIZ000-LHZ000-LMZ000-LSZ000-010200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 407
NWS STORM PREDICTION CENTER NORMAN OK
155 PM EDT TUE MAY 31 2011

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

NORTHERN LOWER AND MUCH OF UPPER MICHIGAN
NORTHEAST WISCONSIN
LAKE HURON
LAKE MICHIGAN
LAKE SUPERIOR

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 155 PM UNTIL
1000 PM EDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 95
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST
SOUTHWEST OF IRON MOUNTAIN MICHIGAN TO 40 MILES NORTHEAST OF
ALPENA MICHIGAN. 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...SCATTERED THUNDERSTORMS ARE EXPECTED TO INTENSIFY
ACROSS THE WATCH AREA THIS AFTERNOON AS A STRONG UPPER TROUGH
APPROACHES FROM THE WEST. MODERATE INSTABILITY AND FAVORABLE WINDS
ALOFT WILL PROMOTE ORGANIZED STORMS CAPABLE OF DAMAGING WINDS AND
LARGE HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 25040.

...HART

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