WATCHES: Severe Thunderstorm Watch Number 498

WWUS20 KWNS 272051
SEL8
SPC WW 272051
MIZ000-LEZ000-280200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 498
NWS STORM PREDICTION CENTER NORMAN OK
455 PM EDT TUE AUG 27 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL AND SOUTHEAST LOWER MICHIGAN
LAKE ERIE

* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 455 PM UNTIL
1000 PM EDT.

* PRIMARY THREATS INCLUDE...
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTHEAST OF
ROBEN HOOD MICHIGAN TO 20 MILES SOUTHEAST OF JACKSON MICHIGAN.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU8).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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...DEVELOPING STORMS IN CENTRAL LOWER MI SHOULD INTENSIFY
THIS AFTERNOON WHILE MOVING SEWD/SSEWD INTO AN ENVIRONMENT THAT HAS
BEEN DESTABILIZING IN THE WAKE OF EARLIER CONVECTION. THE
COMBINATION OF INSTABILITY AND VERTICAL WIND SHEAR WILL SUPPORT A
RISK FOR EMBEDDED SUPERCELL/BOW STRUCTURES WITH THE POTENTIAL TO
PRODUCE DAMAGING GUSTS AND LARGE HAIL THIS AFTERNOON/EVENING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 34035.


...THOMPSON

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