

697 

WWUS20 KWNS 182326

SEL7

SPC WW 182326

IAZ000-MNZ000-NEZ000-SDZ000-190700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 327

NWS STORM PREDICTION CENTER NORMAN OK

625 PM CDT WED JUN 18 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  EXTREME NORTHWESTERN IOWA

  EXTREME SOUTHWESTERN MINNESOTA

  NORTHEASTERN NEBRASKA

  SOUTHEASTERN SOUTH DAKOTA



* EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 625 PM

  UNTIL 200 AM CDT.



* PRIMARY THREATS INCLUDE...

  A FEW TORNADOES AND A COUPLE INTENSE TORNADOES POSSIBLE

  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 3

    INCHES IN DIAMETER POSSIBLE

  ISOLATED SIGNIFICANT DAMAGING WIND GUSTS TO 75 MPH POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 60 MILES WEST SOUTHWEST OF

MITCHELL SOUTH DAKOTA TO 35 MILES EAST SOUTHEAST 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 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 321...WW 322...WW

323...WW 324...WW 325...WW 326...



DISCUSSION...TORNADIC SUPERCELL IS EXPECTED TO MOVE EWD OUT OF WW

322 SOON INTO NWRN PART OF THIS WW...WHILE ADDITIONAL DVLPMT IS PSBL

BETWEEN THAT AND HIGHER-BASED ACTIVITY NOW STRENGTHENING RAPIDLY

OVER ONL AREA S OF WARM/COLD FRONTAL TRIPLE POINT.  ANY SUPERCELLS

INTERACTING WITH VORTICITY-LADEN WARM FRONTAL ZONE MAY PRODUCE

SIGNIFICANT TORNADOES...BUT ALSO EVOLVE INTO HEAVY-PRECIP MODE

RATHER QUICKLY GIVEN WEAK STORM-RELATIVE MID-UPPER WINDS.  LOW-LEVEL

HODOGRAPHS ARE FCST TO REMAIN LARGE...ESPECIALLY ALG/N OF WARM FRONT

NEAR NEB/SD BORDER.  UPSCALE GROWTH INTO MCS IS PSBL AS WELL.



AVIATION...TORNADOES AND 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

650. MEAN STORM MOTION VECTOR 24020.





...EDWARDS

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