Hazardous Weather Outlook

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1155 AM CDT TUE MAY 21 2013

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
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WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE-
DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-
IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON-
1155 AM CDT TUE MAY 21 2013 /1255 PM EDT TUE MAY 21 2013/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

 WEATHER HAZARDS EXPECTED:

  THUNDERSTORMS...THE STRONGEST COULD PRODUCE:
    HAIL TO THE SIZE OF DIMES.
    WIND GUSTS TO 50 MPH.
    FREQUENT CLOUD TO GROUND LIGHTNING.
    HEAVY RAIN.

  AREAS AFFECTED AND TIMING:

  COMPARED TO EARLIER THINKING...THE SEVERE WEATHER THREAT HAS
  DECREASED ACROSS NORTHERN ILLINOIS AND NORTHWEST INDIANA.
  SHOWERS AND THUNDERSTORMS ARE STILL EXPECTED...ESPECIALLY THIS
  EVENING AND OVERNIGHT...AND A FEW COULD PRODUCE SMALL HAIL AND
  GUSTY WINDS ALONG WITH LOCALLY HEAVY RAIN...PRIMARILY IN
  NORTHWEST INDIANA.

  DISCUSSION:

  THE BEST CHANCE FOR SHOWERS AND THUNDERSTORMS APPEARS TO BE THIS
  EVENING INTO TONIGHT AHEAD OF AN APPROACHING COLD FRONT. THIS IS
  NOT AN OPTIMAL TIME FOR SURFACE BASED INSTABILITY...AND DEEP
  LAYER SHEAR ALSO DOES NOT APPEAR FAVORABLE FOR ORGANIZED
  CONVECTION DURING THAT TIME PERIOD. HEAVY RAINFALL AND LOCALIZED
  FLOODING STILL ARE A POSSIBILITY.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE WEDNESDAY AND
AGAIN SATURDAY THROUGH MONDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.

&&

$$