WATCHES: Severe Thunderstorm Watch Number 502

WWUS20 KWNS 292255
SEL2
SPC WW 292255
MNZ000-WIZ000-LSZ000-300600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 502
NWS STORM PREDICTION CENTER NORMAN OK
545 PM CDT THU AUG 29 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

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

* EFFECTIVE THIS THURSDAY AFTERNOON AND FRIDAY MORNING FROM 545
PM UNTIL 100 AM CDT.

* PRIMARY THREATS INCLUDE...
SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2
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 95
STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES EAST
NORTHEAST OF HIBBING MINNESOTA TO 45 MILES EAST OF SAINT CLOUD
MINNESOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

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...TSTM NOW IN N CNTRL MN IS FORMING IN ZONE OF MAXIMUM
LOW-LVL CONFLUENCE ZONE NEAR INTERSECTION OF OUTFLOW BOUNDARY LEFT
BY EARLIER MCS /NOW IN WI/ AND NE-SW COLD FRONT ASSOCIATED WITH SW
ONT/NW MN UPR IMPULSE. THIS STORM...AND OTHERS FORMING FARTHER SE
ALONG THE OUTFLOW BOUNDARY...ARE EXPECTED TO CONTINUE
MOVING/DEVELOPING ESE THROUGH MID-EVE.
AMPLE DEEP SHEAR AND MOISTURE SHOULD REMAIN PRESENT FOR SUPERCELLS
CAPABLE OF SVR HAIL/WIND. IN ADDITION...A NON-ZERO THREAT WILL EXIST
FOR A TORNADO OR TWO...GIVEN THE PRESENCE OF A SUSTAINED SUPERCELL.
THIS THREAT SHOULD BE GREATEST OVER THE NEXT FEW HOURS IN ZONE OF
BACKED LOW-LVL FLOW ALONG OUTFLOW BOUNDARY...WHERE LOW-LVL
DESTABILIZATION WILL BE GREATEST...AND WHERE SWLY LLJ WILL INCREASE
AFTER SUNSET. THE OVERALL TORNADO THREAT SHOULD...HOWEVER...BE
LIMITED IN SPACE AND TIME.

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 28030.


...CORFIDI

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