

681 

WWUS20 KWNS 220138

SEL4

SPC WW 220138

IAZ000-MNZ000-NEZ000-SDZ000-220800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 344

NWS STORM PREDICTION CENTER NORMAN OK

835 PM CDT SAT JUN 21 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHWESTERN IOWA

  SOUTHWESTERN MINNESOTA

  NORTHEASTERN NEBRASKA

  SOUTHEASTERN SOUTH DAKOTA



* EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 835 PM

  UNTIL 300 AM CDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 75

    MPH POSSIBLE

  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES WEST

SOUTHWEST OF MITCHELL SOUTH DAKOTA TO 15 MILES SOUTH SOUTHEAST OF

WORTHINGTON MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 340...WW 341...WW

342...WW 343...



DISCUSSION...MERGER OF TWO TSTM AREAS AND THEIR OUTFLOW BOUNDARIES

NOW IN WW 341 IS EXPECTED TO YIELD MCS WITH PRIMARY RISK OF DAMAGING

WIND...SHIFTING EWD TO ESEWD ACROSS THIS REGION INTO TONIGHT.

FORCED ASCENT WILL OVERCOME GRADUAL INCREASE IN MLCINH TO MAINTAIN

SOME DAMAGING WIND THREAT AT LEAST AS FAR E AS EXTREME SWRN MN/NWRN

IA.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 28030.





...EDWARDS

