National Weather Service Weather Forecast Office

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

000
FLUS43 KLOT 122044
HWOLOT

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
344 PM CDT WED JUN 12 2013

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
132045-
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-
344 PM CDT WED JUN 12 2013 /444 PM EDT WED JUN 12 2013/

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

.DAY ONE...TONIGHT.

WEATHER HAZARDS EXPECTED:

  NUMEROUS SEVERE THUNDERSTORMS...SOME COULD PRODUCE:

  STRONG TORNADOES.
  DAMAGING WINDS UP TO 80 TO 100 MPH.
  ISOLATED HAIL TO THE SIZE OF BASEBALLS.
  VERY HEAVY RAINFALL WHICH COULD CAUSE FLASH FLOODING

  AREAS AFFECTED AND TIMING:

  SCATTERED THUNDERSTORMS DEVELOPING ACROSS FAR EASTERN IOWA...
  SOUTHWEST WISCONSIN...AND NORTHWEST ILLINOIS THIS AFTERNOON WILL
  EVOLVE EAST ACROSS NORTH CENTRAL ILLINOIS...INCLUDING THE
  ROCKFORD AREA...BY LATE AFTERNOON. THESE STORMS WILL HAVE AN
  ENHANCED TORNADIC THREAT AS THEY RAPIDLY STRENGTHEN INTO EARLY
  THIS EVENING. THE STORMS WILL MOVE EAST ACROSS ALL OF NORTHERN
  ILLINOIS AND INTO NORTHWEST INDIANA THROUGH THE EVENING HOURS.
  THE STRONGEST THUNDERSTORMS WITH THE GREATEST PROBABILITY TO
  PRODUCE SEVERE WEATHER WILL IMPACT THE CHICAGOLAND AREA BETWEEN
  6 AND 11 PM. THE PRIMARY THREAT OF THESE STORMS WILL BE DAMAGING
  WINDS AND HEAVY RAINFALL...WITH ISOLATED THREATS OF LARGE HAIL
  AND TORNADOES. WHILE ALL STORMS WILL BE CAPABLE OF PRODUCING
  HEAVY RAIN...THE GREATEST FLASH FLOOD THREAT WILL LIKELY BE
  GENERALLY ALONG AND NORTH OF THE I-80 CORRIDOR IN NORTHERN
  ILLINOIS AND NORTH OF THE KANKAKEE RIVER IN NORTHWESTERN
  INDIANA...WHICH INCLUDES ALL OF THE CHICAGO AND ROCKFORD METRO
  AREAS.

  DISCUSSION:

  LOW PRESSURE WILL MOVE EAST ALONG A WARM FRONT ACROSS NORTHERN
  ILLINOIS AND INDIANA THIS EVENING. A VERY WARM...HUMID AND
  UNSTABLE AIR MASS WILL BE IN PLACE ALONG AND SOUTH OF THE WARM
  FRONT. THE COMBINATION OF STRONG INSTABILITY AND STRENGTHENING
  WIND SHEAR WILL LIKELY LEAD TO A SIGNIFICANT SEVERE WEATHER
  OUTBREAK THROUGH THIS EVENING ACROSS THE REGION. STRONG...
  DAMAGING WIND IS THE GREATEST THREAT...BUT VERY LARGE HAIL AND
  ISOLATED TORNADOES ARE POSSIBLE AS WELL. IN ADDITION... HEAVY
  RAINFALL...MAINLY ALONG AND NORTH OF THE I-80 CORRIDOR IN
  ILLINOIS AND NORTH OF THE KANKAKEE RIVER IN INDIANA WILL LEAD TO
  THE POTENTIAL FOR FLASH FLOODING THROUGH TONIGHT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

THERE IS AN INCREASED RISK FOR RIP CURRENTS THURSDAY.

THERE IS A CHANCE OF THUNDERSTORMS EARLY SATURDAY MORNING THROUGH
MONDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NECESSARY THROUGH TONIGHT.

&&

$$

LMZ740>745-132045-
WINTHROP HARBOR TO WILMETTE HARBOR-
WILMETTE HARBOR TO NORTHERLY ISLAND-
NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY-
GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY-
344 PM CDT WED JUN 12 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE
WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE
MICHIGAN.

.DAY ONE...TONIGHT.

THUNDERSTORMS ARE LIKELY. SOME STORMS MAY PRODUCE WIND GUSTS IN
EXCESS OF 50 KTS AND LARGE HAIL THROUGH THIS EVENING.

STRONG WINDS AND HIGH WAVES WILL LEAD TO HAZARDOUS CONDITIONS FOR
SMALL CRAFT LATE TONIGHT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

STRONG WINDS AND HIGH WAVES WILL LEAD TO HAZARDOUS CONDITIONS FOR
SMALL CRAFT THROUGH THURSDAY AFTERNOON FOR THE ILLINOIS NEARSHORE
WATERS AND THROUGH THURSDAY EVENING FOR THE NORTHWEST INDIANA
NEARSHORE WATERS.

THERE IS A CHANCE OF THUNDERSTORMS SATURDAY THROUGH MONDAY.

&&

$$

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-132045-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE
MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH
FOX ISLAND 5 NM OFFSHORE-
LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI-
LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE
TO MID LAKE-
LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO
MID LAKE-
344 PM CDT WED JUN 12 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.

.DAY ONE...TONIGHT.

THUNDERSTORMS ARE LIKELY OVER THE SOUTH HALF OF LAKE MICHIGAN.
SOME STORMS MAY PRODUCE WIND GUSTS IN EXCESS OF 50 KTS AND LARGE
HAIL THIS EVENING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

THERE IS A CHANCE OF THUNDERSTORMS SATURDAY THROUGH MONDAY.

&&

$$

KREIN

VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)

FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO