

260 

WWUS20 KWNS 221655

SEL5

SPC WW 221655

IAZ000-ILZ000-MNZ000-MOZ000-WIZ000-230000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 345

NWS STORM PREDICTION CENTER NORMAN OK

1155 AM CDT SUN JUN 22 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EASTERN IOWA

  NORTHWEST ILLINOIS

  EXTREME SOUTHEAST MINNESOTA

  EXTREME NORTHEAST MISSOURI

  SOUTHWEST AND WEST CENTRAL WISCONSIN



* EFFECTIVE THIS SUNDAY MORNING AND EVENING FROM 1155 AM UNTIL

  700 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 30 MILES NORTHWEST OF

CAMP DOUGLAS WISCONSIN TO 30 MILES SOUTH SOUTHWEST OF BURLINGTON

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...STORMS ALONG THE LEADING EDGE OF A MCS HAVE ORGANIZED

INTO A LINEAR STRUCTURE WITH NEW CELLS DEVELOPING IN ADVANCE OF THE

SYSTEM WHERE VISIBLE IMAGERY SHOWS AN INCREASING CU FIELD.  THE AIR

MASS CONTINUES TO DESTABILIZE WITH STRONG HEATING TAKING PLACE

CONTRIBUTING TO CAPE NEAR 1500-2000 J/KG.  STRONGER CONVECTIVELY

ENHANCED WSWLY WINDS ALOFT WILL AID IN SYSTEM MAINTENANCE THIS

AFTERNOON WITH POTENTIAL FOR STORMS TO PRODUCE LARGE HAIL AND

DAMAGING WIND GUSTS AS STORMS BECOME SURFACE-BASED.



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 26025.





...WEISS

