Hazardous Weather Outlook

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
431 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-
431 AM CDT TUE MAY 21 2013 /531 AM EDT TUE MAY 21 2013/

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

.DAY ONE...TODAY AND TONIGHT.

 WEATHER HAZARDS EXPECTED:

  THUNDERSTORMS...THE STRONGEST COULD PRODUCE:
    HAIL TO THE SIZE OF HALF DOLLARS.
    WIND GUSTS OVER 60 MPH.
    FREQUENT CLOUD TO GROUND LIGHTNING.
    AND HEAVY RAIN.

  AREAS AFFECTED AND TIMING:

  THUNDERSTORMS WILL BEGIN TO DEVELOP EARLY IN THE AFTERNOON
  ACROSS ALL OF NORTHERN ILLINOIS AND NORTHWEST INDIANA...WITH
  STRONGER STORMS POSSIBLY BECOMING SEVERE IN THE LATE AFTERNOON
  AND CONTINUING THROUGH THE EVENING PERIODS ALONG AND EAST OF A
  PONTIAC TO GARY LINE.

  DISCUSSION:

  A LULL IN THE THUNDERSTORMS WILL HOLD THROUGH THE MORNING HOURS
  WITH THE DEVELOPMENT OF A CAPPED ENVIRONMENT. AS THE DAY
  PROGRESSES AND THE SURFACE WARMS...THE CAPPED ENVIRONMENT WILL
  BEGIN TO DISSIPATE AND ALLOW THUNDERSTORMS TO DEVELOP.
  THUNDERSTORMS WILL GROW IN COVERAGE AND INTENSITY IN THE LATE
  AFTERNOON THROUGH EVENING HOURS...POSSIBLY DEVELOPING INTO A
  A LINE SEGMENT. THE MOST FAVORED AREAS FOR THIS TO OCCUR WILL BE
  ALONG AND EAST OF A PONTIAC TO GARY LINE.

  THE MAIN THREAT WILL BE DAMAGING WIND GUSTS BUT SOME HAIL IS ALSO
  POSSIBLE. THE COMBINATION OF A MOISTURE RICH ENVIRONMENT AND
  ADDITIONAL THUNDERSTORMS EXPECTED TO STRETCH SOUTHWEST INTO
  SOUTHWEST ILLINOIS...MAY LEAD TO HEAVY RAINFALL AND LOCALIZED
  FLOODING.

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

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

.SPOTTER INFORMATION STATEMENT...

SPOTTERS MAY BE NEEDED THIS AFTERNOON THROUGH TONIGHT.

&&

$$