SEL0
SPC WW 202238
MIZ000-LMZ000-210400-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 630
NWS STORM PREDICTION CENTER NORMAN OK
540 PM CDT FRI AUG 20 2010
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
LARGE PART OF CENTRAL AND NORTHERN LOWER MICHIGAN
LAKE MICHIGAN
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 540 PM UNTIL
1100 PM CDT.
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 50
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH
NORTHEAST OF TRAVERSE CITY MICHIGAN TO 30 MILES SOUTHWEST OF
GRAND RAPIDS MICHIGAN. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).
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 627...WW 628...WW 629...
DISCUSSION...LINE OF SEVERE THUNDERSTORMS MOVING EWD ACROSS LM WILL
MAINTAIN A DAMAGING WIND POTENTIAL FOR SEVERAL HOURS AS AIR MASS
ACROSS THE WATCH AREA IS MDTLY UNSTABLE WITH 30-40KT OF SHEAR.
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 550. MEAN STORM
MOTION VECTOR 26030.
...HALES
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