Hazardous Weather Outlook
Issued by NWS Chicago, IL

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510
FLUS43 KLOT 140924
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
424 AM CDT Sat Oct 14 2017

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
150930-
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-
424 AM CDT Sat Oct 14 2017 /524 AM EDT Sat Oct 14 2017/

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

.DAY ONE...Today and Tonight.

WEATHER HAZARDS EXPECTED:
  Significant Thunderstorm Risk...with an associated:
     Limited Tornado Risk.
     Elevated Hail Risk...up to nickel size.
     Significant Thunderstorm Wind Damage Risk...up to 70 MPH.
  Significant Flooding Risk.
  Limited Non Thunderstorm Wind Risk.

DISCUSSION:

Several waves of showers and thunderstorms are expected to move
across northern Illinois today into tonight. The storms during
much of the day are not expected to be severe, but will produce
heavy rainfall and possible flash flooding as they move over the
same areas.

A strong cold front will then shift across the area tonight,
resulting in the likelihood for an eastward moving line of strong
to severe showers and thunderstorms. The main threat from these
storms this evening into tonight will be damaging wind gusts in
excess of 70 mph. However, there will also be a nonzero risk of
tornados across north central Illinois. Very heavy rainfall will
also continue to be a hazard with these storms, and this could
result in rapid rises, and possible flooding on area streams and
rivers.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Sunday...
  Limited Non Thunderstorm Wind Risk.
  Elevated Frost Risk Sunday night.
Monday...
  Elevated Frost Risk in the AM.


.SPOTTER INFORMATION STATEMENT...

Spotters will likely be needed late this afternoon and this
evening.

GENERAL STORM MOTION OF THE DAY:

Moving east northeast at 50 MPH...

&&

$$

LMZ740>745-150930-
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-
424 AM CDT Sat Oct 14 2017

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

.DAY ONE...Today and Tonight.

  Elevated Thunderstorm Risk.
  Gale Force Winds or Very Hazardous Waves are likely tonight.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Sunday...
  Gale Force Winds or Very Hazardous Waves are likely.
Wednesday...
  Hazardous Conditions for Small Craft are likely.

&&

$$

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-150930-
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-
424 AM CDT Sat Oct 14 2017

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

.DAY ONE...Today and Tonight.

Elevated thunderstorm risk over southern Lake Michigan.

Gale force winds are expected tonight.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Gale force winds will continue on Sunday.

&&

$$

KJB

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