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698 

WWUS20 KWNS 281909

SEL5

SPC WW 281909

IAZ000-MNZ000-WIZ000-290200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 365

NWS STORM PREDICTION CENTER NORMAN OK

210 PM CDT SAT JUN 28 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL IOWA

  CENTRAL AND SOUTHERN MINNESOTA

  EXTREME WEST CENTRAL WISCONSIN



* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 210 PM UNTIL

  900 PM CDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  SCATTERED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTHEAST OF

SAINT CLOUD MINNESOTA TO 40 MILES SOUTH SOUTHWEST OF KNOXVILLE

IOWA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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...SEVERAL NORTH-SOUTH BANDS OF THUNDERSTORMS ARE EXPECTED

TO CONTINUE DEVELOPING ALONG AND AHEAD OF A PRE-FRONTAL CONVERGENCE

ZONE MOVING ACROSS MN AND IA.  THE AIR MASS IS MODERATELY TO

STRONGLY UNSTABLE WITH MLCAPE RANGING FROM 1500 J/KG OVER SERN MN TO

2500 J/KG IN IA.  VERTICAL SHEAR WILL BE INCREASING FROM THE WEST AS

A SHORT WAVE TROUGH LIFTS NEWD TOWARD THE UPPER MS VALLEY...WITH

POTENTIAL FOR STRONGER STORMS TO PRODUCE DAMAGING WIND GUSTS AND

HAIL.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 20035.





...WEISS

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