

306 

WWUS20 KWNS 181408

SEL4

SPC WW 181408

MIZ000-LHZ000-LMZ000-182200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 124

NWS STORM PREDICTION CENTER NORMAN OK

1010 AM EDT THU APR 18 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  SOUTHERN MICHIGAN

  LAKE HURON

  LAKE MICHIGAN



* EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1010 AM UNTIL

  600 PM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL TORNADOES POSSIBLE

  SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 80

    MPH POSSIBLE

  A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE

MILES EAST AND WEST OF A LINE FROM 15 MILES NORTHWEST OF SAGINAW

MICHIGAN TO 20 MILES SOUTHEAST OF JACKSON MICHIGAN.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU4).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 122...WW 123...



DISCUSSION...AS A WARM FRONT LIFTS NORTHWARD ACROSS THE

REGION...DESTABILIZATION WILL ALLOW FOR FURTHER INTENSIFICATION OF A

PRE-COLD FRONTAL SQUALL LINE RAPIDLY ADVANCING NORTHEASTWARD INTO

REGION.  DISCRETE SUPERCELL DEVELOPMENT ALSO APPEARS POSSIBLE WITH

THE RISK FOR TORNADOES AHEAD OF THE LINE...BEFORE IT MOVES EAST OF

THE WATCH AREA BY LATE THIS AFTERNOON.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

450. MEAN STORM MOTION VECTOR 24050.





...KERR

