Hazardous Weather Outlook
Issued by NWS Chicago, IL

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

000
FLUS43 KLOT 141729
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1229 PM CDT Sat Oct 14 2017

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
151730-
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-
1229 PM CDT Sat Oct 14 2017 /129 PM EDT Sat Oct 14 2017/

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

.DAY ONE...This Afternoon and Tonight.

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

In addition, flooding is expected along portions of the Des Plaines,
Du Page, and Fox Rivers.

DISCUSSION:

Additional waves of showers and thunderstorms are expected to move
across northern Illinois into tonight. Any severe threat with the
storms during much of the afternoon hours is expected to be
limited to isolated gusty to damaging winds, 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 thunderstorms. The main threat from these storms this
evening into tonight will be damaging wind gusts. However, there
will also be a nonzero isolated tornado risk across parts of
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.

In addition, flooding is expected to continue along portions of the
Des Plaines, Du Page, and Fox Rivers.

.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>745-151730-
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-
1229 PM 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...This Afternoon and Tonight.

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

.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-
870-872-874-876-878-151730-
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-
1229 PM CDT Sat Oct 14 2017

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

.DAY ONE...This Afternoon 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.

&&

$$

RC

Visit us at http://weather.gov/chicago

Follow us on Facebook, Twitter, and Youtube at:
www.facebook.com/nwschicago
www.twitter.com/nwschicago
www.youtube.com/nwschicago



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.