WATCHES: Severe Thunderstorm Watch Number 420

WWUS20 KWNS 182157
SEL0
SPC WW 182157
MNZ000-WIZ000-LSZ000-190500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 420
NWS STORM PREDICTION CENTER NORMAN OK
455 PM CDT THU JUL 18 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN MINNESOTA
NORTHWEST WISCONSIN
LAKE SUPERIOR

* EFFECTIVE THIS THURSDAY AFTERNOON FROM 455 PM UNTIL MIDNIGHT
CDT.

* PRIMARY THREATS INCLUDE...
SEVERAL SIGNIFICANT DAMAGING WIND GUSTS TO 75 MPH POSSIBLE
SEVERAL VERY LARGE HAIL EVENTS TO 3 INCHES IN DIAMETER POSSIBLE
A FEW TORNADOES POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 70 MILES SOUTHWEST
OF BEMIDJI MINNESOTA TO 50 MILES NORTHEAST OF GRAND MARAIS
MINNESOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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...THUNDERSTORMS ARE BEGINNING TO FORM ALONG THE COLD
FRONT OVER NORTHERN MN. THIS ACTIVITY SHOULD TRACK EASTWARD ACROSS
THE WATCH AREA THROUGH THE EVENING. A FEW SUPERCELLS AND BOW
STRUCTURES ARE POSSIBLE WITH A RISK OF VERY LARGE HAIL AND DAMAGING
WINDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27035.


...HART

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