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123 

WWUS20 KWNS 282301

SEL1

SPC WW 282301

ILZ000-LMZ000-290400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 311

NWS STORM PREDICTION CENTER NORMAN OK

605 PM CDT MON MAY 28 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN ILLINOIS

       LAKE MICHIGAN



EFFECTIVE THIS MONDAY EVENING FROM 605 PM UNTIL 1100 PM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES SOUTH

SOUTHWEST OF MARSEILLES ILLINOIS TO 65 MILES EAST NORTHEAST OF

ROCKFORD ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 308...WW 309...WW 310...



DISCUSSION...THUNDERSTORMS HAVE DEVELOPED ROUGHLY ALONG THE MS RIVER

DURING THE PAST COUPLE OF HOURS...AND WILL TRACK EASTWARD ACROSS THE

WATCH AREA THIS EVENING.  STRONG INSTABILITY AND SUFFICIENT

EFFECTIVE SHEAR WILL PROMOTE ORGANIZED MULTICELL STORMS CAPABLE OF

LOCALLY DAMAGING WINDS AND HAIL.



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 25030.





...HART

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