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Hazardous Weather Outlook

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1104 AM CDT SAT SEP 20 2014

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
211615-
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-
1104 AM CDT SAT SEP 20 2014 /1204 PM EDT SAT SEP 20 2014/

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

  WEATHER HAZARDS EXPECTED:

  SCATTERED THUNDERSTORMS...A FEW MAY PRODUCE:
  HAIL TO THE SIZE OF QUARTERS.
  DAMAGING WIND GUSTS IN EXCESS OF 60 MPH.
  LOCALLY HEAVY RAINFALL.

  AREAS AFFECTED AND TIMING:

  WHILE SCATTERED THUNDERSTORMS ARE EXPECTED FOR THE ENTIRE
  OUTLOOK AREA THIS AFTERNOON...THE HIGHER THREAT FOR STRONG TO
  SEVERE THUNDERSTORMS WILL ROUGHLY BE SOUTH OF A CHICAGO TO
  MENDOTA LINE IN THE EARLY TO LATE AFTERNOON. WIDESPREAD
  THUNDERSTORM ACTIVITY IS EXPECTED TO SHIFT TO MAINLY EAST OF
  INTERSTATE 57 BY EARLY EVENING.

  DISCUSSION:

  SHOWER AND THUNDERSTORM COVERAGE IS EXPECTED TO INCREASE THIS
  AFTERNOON AS A COLD FRONT APPROACHES...WITH THE STORMS SHIFTING
  SOUTHEAST ACROSS THE OUTLOOK AREA INTO THE EARLY EVENING HOURS.
  A COMBINATION OF MODERATE INSTABILITY AND FAIRLY HIGH LEVELS OF
  DEEP LAYER WIND SHEAR IS EXPECTED TO YIELD A THREAT FOR ISOLATED
  TO SCATTERED STRONG TO SEVERE STORMS CAPABLE OF PRODUCING STRONG
  WINDS AND HAIL. THE ATMOSPHERE IS CAPPED TO INTENSE THUNDERSTORM
  DEVELOPMENT AS OF THE LATE MORNING HOURS...SO THE HIGHER THREAT
  FOR STRONG TO SEVERE THUNDERSTORM DEVELOPMENT IS EXPECTED TO BE
  LIMITED TO AREAS PRIMARILY SOUTH OF A MENDOTA TO CHICAGO LINE
  THIS AFTERNOON WHERE THERE WILL BE MORE TIME TO INCREASE
  INSTABILITY LEVELS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY THROUGH TONIGHT.

&&

$$



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Page last modified: May 16, 2007
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