

790 

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

