WATCHES: Severe Thunderstorm Watch Number 507

WWUS20 KWNS 311956
SEL7
SPC WW 311956
MNZ000-NDZ000-SDZ000-WIZ000-LSZ000-010200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 507
NWS STORM PREDICTION CENTER NORMAN OK
250 PM CDT SAT AUG 31 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
MUCH OF MINNESOTA
FAR SOUTHEAST NORTH DAKOTA
PARTS OF EASTERN SOUTH DAKOTA
PORTIONS OF NORTHWESTERN WISCONSIN
LAKE SUPERIOR

* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 250 PM UNTIL
900 PM CDT.

* PRIMARY THREATS INCLUDE...
SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO
2.5 INCHES IN DIAMETER POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
A FEW TORNADOES POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 120
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES WEST
NORTHWEST OF ELY MINNESOTA TO 5 MILES SOUTHWEST OF SIOUX FALLS
SOUTH DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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 SLOWLY DEVELOPING ATTM FROM
NORTHWESTERN MINNESOTA/NORTHEASTERN NORTH DAKOTA SOUTHWARD INTO
NORTH CENTRAL AND NORTHEASTERN SOUTH DAKOTA...AHEAD OF AN ADVANCING
COLD FRONT AND ASSOCIATED UPPER SYSTEM CROSSING THE SOUTHERN
CANADIAN PRAIRIE.
WITH ADDITIONAL DESTABILIZATION OF THE PRE-FRONTAL AIRMASS...EXPECT
AN INCREASE IN STORM COVERAGE AND INTENSITY OVER THE NEXT FEW HOURS
-- AIDED BY MODERATELY STRONG MID-LEVEL WLYS. INITIAL MIXED-MODE
CONVECTION IS LIKELY TO GROW UPSCALE LINEARLY...WITH LARGE HAIL AND
DAMAGING WINDS THE MAIN SEVERE RISK -- THOUGH AN ISOLATED TORNADO
WILL ALSO BE ALSO POSSIBLE.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 28040.


...GOSS

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