Alert archive / Illinois / River Flood Warnings in 2017

River Flood Warning 103, NWS Chicago, IL

July 20, 2017Cook County, Illinois

NWS Chicago, IL issued this river flood warning at Jul 20, 2017, 8:15 AM CDT for Cook County, Illinois. It took effect at Jul 20, 2017, 2:07 PM CDT. It was in force for 5 days.

The area

The counties it named.

The facts

Issued: Jul 20, 2017, 8:15 AM CDT (13:15 UTC)
In effect from: Jul 20, 2017, 2:07 PM CDT
Expired: Jul 25, 2017, 7:00 AM CDT
In force: 5 days
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: Minor

County Cook County, IL

The radar

The Chicago radar (KLOT), 49 km from the middle of the area, began a volume at 13:14 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The river

Written for the forecast point Des Plaines River at Riverside (RVRI2). The gauge peaked at 7.87 ft at Jul 22, 2017, 4:00 PM CDT.

Action stage: 7 ft
Minor stage: 7.5 ft
Moderate stage: 8 ft
Major stage: 9 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 05532500, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

The local office's own words before this river flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Chicago, IL wrote its last area forecast discussion before this river flood warning went out at Jul 20, 7:27 AM CDT, 48 minutes earlier.

Area forecast discussion, Jul 20, 7:27 AM CDT, 48 minutes before

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Hazardous weather outlook, Jul 20, 3:39 AM CDT, 4 hours 36 minutes before

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
339 AM CDT Thu Jul 20 2017

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
210845-
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-
339 AM CDT Thu Jul 20 2017 /439 AM EDT Thu Jul 20 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:
      Elevated Flooding Risk.
      Limited Hail Risk...up to half dollar size.
      Limited Thunderstorm Wind Damage Risk...up to 60 MPH.
  Elevated Excessive Heat Risk.

DISCUSSION:

Thunderstorms will move slowly southeast over northern Illinois
and possibly northwest Indiana through mid-morning. These will
produce periods of very heavy rainfall which could cause flooding.
Also, they will bring isolated winds in excess of 40 mph.

Isolated storms are possible this afternoon into tonight along
the outflow boundary from the morning storms. While coverage of
storms is likely to be limited, if they can develop they will have
heavy rain and a possible flooding threat, as well as some chance
to be severe.

If rain cooled air and clouds have a limited effect, locations
south of Interstate 80 will have heat index readings approach 105
degrees this afternoon.

Flooding will continue along portions of the Fox and Des Plaines
Rivers.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday...
  Significant Flooding Risk.
  Elevated Severe Thunderstorm Risk.
  Elevated Excessive Heat Risk.
Saturday...
  Limited Flooding Risk.
  Elevated Severe Thunderstorm Risk.
  Elevated Excessive Heat Risk.
Sunday...
  Limited Thunderstorm Risk.
Wednesday...
  Limited Thunderstorm Risk.

DISCUSSION:

An active and humid weather pattern will continue through Saturday.
Thunderstorms are likely at times Friday and more so Friday night,
especially north of Interstate 80. The potential for heavy rain in
the region is significant which could cause worsened flooding.
However, the exact location of the heaviest rainfall is uncertain.
In addition there is a severe thunderstorm threat, mainly north of
Interstate 80, on Friday and Friday night as well.

Thunderstorm chances continue on Saturday, shifting mainly along and
south of Interstate 80 by Saturday night.

Heat index readings will approach 105 degrees both Friday and
Saturday, mainly along and south of Interstate 80.

In addition, flooding will continue along portions of the Fox and
Des Plaines Rivers and may develop along other rivers of far
northern Illinois.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed this afternoon and evening.

GENERAL STORM MOTION OF THE DAY:

Moving to the southeast at 25 mph.

&&

LMZ740>745-210845-
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-
339 AM CDT Thu Jul 20 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.

Significant Thunderstorm Risk especially in the morning.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday...
  Significant Thunderstorm Risk.
Saturday...
  Limited Thunderstorm Risk.
Sunday...
  Limited Thunderstorm Risk.
  Hazardous Conditions for Small Craft are likely.
Monday...
  Hazardous Conditions for Small Craft are likely.
Wednesday...
  Limited Thunderstorm Risk.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-210845-
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-
339 AM CDT Thu Jul 20 2017

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

.DAY ONE...Today and Tonight.

Thunderstorms are likely this morning across the south with a
chance across the south this afternoon and tonight.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Periods of thunderstorms are expected through Saturday and
again possible on Wednesday.

&&

MTF

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In the hours before

Special weather statement, Jul 20, 6:47 AM CDT, 1 hour 28 minutes before

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Local storm report, Jul 20, 6:49 AM CDT, 1 hour 26 minutes before

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Local storm report, Jul 20, 7:13 AM CDT, 1 hour 2 minutes before

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Local storm report, Jul 20, 7:24 AM CDT, 51 minutes before

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Special weather statement, Jul 20, 7:27 AM CDT, 48 minutes before

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Local storm report, Jul 20, 7:29 AM CDT, 46 minutes before

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The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 19, 7:21 PM CDT	Severe Thunderstorm Warning	LOT	Ogle, Winnebago	54 min
Jul 19, 7:54 PM CDT	Severe Thunderstorm Warning	LOT	Boone, DeKalb, Lee, McHenry, Ogle, Winnebago	51 min
Jul 19, 8:05 PM CDT	Special Marine Warning	LOT		25 min
Jul 19, 8:16 PM CDT	Tornado Warning	LOT	Boone, DeKalb, Ogle, Winnebago	29 min
Jul 19, 8:24 PM CDT	Special Marine Warning	LOT		2 hr
Jul 19, 8:30 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, LaSalle, Lee	30 min
Jul 19, 8:34 PM CDT	Severe Thunderstorm Warning	LOT	Boone, Cook, DeKalb, DuPage, Kane, Kendall and 4 more	56 min
Jul 19, 9:08 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Grundy, Kendall, Will	67 min
Jul 19, 9:55 PM CDT	Special Weather Statement	LOT	Kankakee	35 min
Jul 19, 10:26 PM CDT	Special Marine Warning	LOT		64 min
Jul 19, 10:37 PM CDT	Special Weather Statement	LOT	Ford, Iroquois	53 min
Jul 19, 10:49 PM CDT	Special Weather Statement	LOT	Boone, DeKalb, Kane, Lake, McHenry, Winnebago	56 min
Jul 20, 3:28 AM CDT	Special Weather Statement	LOT	Boone, Ogle, Winnebago	47 min
Jul 20, 3:48 AM CDT	Severe Thunderstorm Warning	LOT	Boone, DeKalb, Ogle, Winnebago	42 min
Jul 20, 4:21 AM CDT	Severe Thunderstorm Warning	LOT	Boone, DeKalb, Kane, Ogle	39 min
Jul 20, 4:38 AM CDT	Special Weather Statement	LOT	Lee, Ogle	52 min
Jul 20, 6:47 AM CDT	Special Weather Statement	LOT	DeKalb, LaSalle, Lee	43 min
Jul 20, 7:14 AM CDT	Areal Flood Advisory	LOT	Cook, DuPage, Kane, Kendall, Lake, Will	2 hr
Jul 20, 7:21 AM CDT	River Flood Advisory	LOT	Winnebago	7 days
Jul 20, 7:21 AM CDT	River Flood Advisory	LOT	Ogle	5 days
Jul 20, 7:21 AM CDT	River Flood Advisory	LOT	Lee	66 hr
Jul 20, 7:27 AM CDT	Special Weather Statement	LOT	Grundy, Kendall, LaSalle, Livingston	48 min
Jul 20, 9:23 AM CDT	River Flood Watch	LOT	Winnebago	24 hr
Jul 20, 9:30 AM CDT	River Flood Advisory	LOT	Boone	4 days
Jul 20, 9:30 AM CDT	River Flood Advisory	LOT	Winnebago	52 hr
Jul 20, 9:30 AM CDT	River Flood Advisory	LOT	Winnebago	7 days
Jul 20, 9:30 AM CDT	River Flood Advisory	LOT	Winnebago	7 days
Jul 20, 2:15 PM CDT	Flash Flood Watch	LOT	Boone, DeKalb, DuPage, Grundy, Kane, Kendall and 6 more	42 hr
Jul 20, 2:51 PM CDT	River Flood Warning	LOT	Winnebago	6 days
Jul 20, 2:51 PM CDT	River Flood Warning	LOT	Winnebago	19 days

Nearby

River Flood Warnings in Illinois, 2017 Every river flood warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.