WATCHES: Tornado Watch Number 336

WWUS20 KWNS 211904
SEL6
SPC WW 211904
IAZ000-MNZ000-SDZ000-220300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 336
NWS STORM PREDICTION CENTER NORMAN OK
200 PM CDT FRI JUN 21 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF
NORTHWEST IOWA
SOUTHWEST INTO CENTRAL MINNESOTA
EASTERN SOUTH DAKOTA

* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 200 PM UNTIL
1000 PM CDT.

* PRIMARY THREATS INCLUDE...
SEVERAL TORNADOES POSSIBLE
NUMEROUS DAMAGING WIND GUSTS LIKELY WITH A FEW SIGNIFICANT GUSTS
TO 80 MPH POSSIBLE
SEVERAL LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL
EVENTS TO 3 INCHES IN DIAMETER POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 100 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES EAST NORTHEAST OF
ALEXANDRIA MINNESOTA TO 50 MILES SOUTHWEST OF SIOUX FALLS SOUTH
DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

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 335...

DISCUSSION...UPSCALE CONVECTIVE GROWTH IS EXPECTED TO PERSIST WITH
THE CONTINUED EVOLUTION OF A SEVERE MESOSCALE CONVECTIVE SYSTEM
ACROSS EASTERN SOUTH DAKOTA INTO SOUTHWEST AND CENTRAL
MINNESOTA...AND PARTS OF ADJACENT NORTHWEST IOWA...LATE THIS
AFTERNOON AND EVENING. IN THE PRESENCE OF THERMODYNAMIC PROFILES
CHARACTERIZED BY STEEP MID-LEVEL LAPSE RATES AND LARGE
CAPE...VERTICAL SHEAR WILL BE SUFFICIENT TO SUPPORT THE RISK FOR
VERY LARGE HAIL AND LOCALLY STRONG WIND GUSTS NEAR STRONGEST STORMS.
A COUPLE OF TORNADOES ARE ALSO POSSIBLE ALONG THE REMNANT
BAROCLINIC ZONE ASSOCIATED WITH CONVECTIVE OUTFLOW GENERATED BY
EARLY MORNING CONVECTION.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24035.


...KERR

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