

995 

WWUS20 KWNS 211342

SEL4

SPC WW 211342

IAZ000-ILZ000-LMZ000-211800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 334

NWS STORM PREDICTION CENTER NORMAN OK

840 AM CDT FRI JUN 21 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EASTERN IOWA

  NORTHERN ILLINOIS

  LAKE MICHIGAN



* EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 840 AM UNTIL

  100 PM CDT.



* PRIMARY THREATS INCLUDE...

  A FEW VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  A FEW DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55

STATUTE MILES EITHER SIDE OF A LINE FROM 20 MILES SOUTHWEST OF

CEDAR RAPIDS IOWA TO 40 MILES NORTHEAST OF MARSEILLES ILLINOIS.

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 333...



DISCUSSION...MOST FAVORABLE INFLOW OF MOIST POTENTIALLY UNSTABLE AIR

REMAINS ON THE SOUTHERN FLANK OF THE WEAKENING MESOSCALE CONVECTIVE

SYSTEM NOW ADVANCING EASTWARD AND SOUTHWARD ACROSS PARTS OF THE

UPPER MIDWEST.  AS THE SUPPORTING MID-LEVEL SHORT WAVE IMPULSE

CONTINUES EASTWARD INTO A MORE STABLE ENVIRONMENT ACROSS THE GREAT

LAKES REGION...SIGNIFICANT RE-INTENSIFICATION OF STORMS CURRENTLY

APPEARS UNLIKELY.  BUT THE RISK FOR SEVERE WIND GUSTS AND HAIL MAY

BE SLOW TO DIMINISH WITH STORMS SPREADING SOUTHWARD ACROSS EASTERN

IOWA AND NORTHERN ILLINOIS.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 32040.





...KERR

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