Alert archive / Illinois / River Flood Warnings in 2017

River Flood Warning 112, NWS Chicago, IL

July 21, 2017Lee County, Illinois

NWS Chicago, IL issued this river flood warning at Jul 21, 2017, 5:22 PM CDT for Lee County, Illinois. It took effect at Jul 22, 2017, 7:51 AM CDT. It was in force for 4 days.

The area

The counties it named.

The facts

Issued
Jul 21, 2017, 5:22 PM CDT (22:22 UTC)
In effect from
Jul 22, 2017, 7:51 AM CDT
Expired
Jul 26, 2017, 7:00 AM CDT
In force
4 days
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Flood severity
Minor

County Lee County, IL

The radar

The Chicago radar (KLOT), 102 km from the middle of the area, began a volume at 22:25 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 Rock River at Dixon (DXRI2). The gauge peaked at 17.69 ft at Jul 22, 2017, 9:00 PM CDT.

actionminormoderate1214161807/2107/2207/2307/2407/2507/2607/27
Action stage
13 ft
Minor stage
16 ft
Moderate stage
18 ft
Major stage
20 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 05442300, 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 21, 4:31 PM CDT, 51 minutes earlier.

Area forecast discussion, Jul 21, 4:31 PM CDT, 51 minutes before
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Hazardous weather outlook, Jul 21, 4:21 PM CDT, 1 hour 1 minute before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
421 PM CDT Fri Jul 21 2017

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
222130-
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-
421 PM CDT Fri Jul 21 2017 /521 PM EDT Fri Jul 21 2017/

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

.DAY ONE...Tonight.

WEATHER HAZARDS EXPECTED:
  Significant Thunderstorm Risk...with an associated:
      Elevated Tornado Risk Along and West of I-39.
      Elevated Hail Risk...up to quarter size.
      Significant Thunderstorm Wind Damage Risk...up to 70
MPH.
  Significant Flooding Risk.
  Significant Excessive Heat Risk.

DISCUSSION:

Severe thunderstorms expected early this evening through late
evening across the entire outlook area, with damaging winds the
primary severe weather threat. In addition, there is an isolated
tornado threat, mainly along and west of I-39. Also, torrential
rainfall will be possible with any storm. Behind the initial
complex of storms, additional heavy rain producing thunderstorms
will likely develop overnight, especially across northern
Illinois. Heaviest rainfall amounts, of 1 to 3 inches or more,
are expected to occur primarily over northern Illinois north of
Interstate 80.

In addition, flooding will continue along portions of the Des
Plaines, Fox, and Kishwaukee rivers.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday...
  Limited Flooding Risk.
  Elevated Severe Thunderstorm Risk.
  Elevated Excessive Heat Risk.
Sunday...
  Limited Severe Thunderstorm Risk.
Thursday...
  Limited Thunderstorm Risk.

In addition, flooding will continue along portions of the Des
Plaines, Fox, Kishwaukee, Rock, and Pecatonica rivers.

.SPOTTER INFORMATION STATEMENT...

Spotters will likely be needed early this evening and overnight.

GENERAL STORM MOTION OF THE DAY:

Toward the east-southeast at 30 to 40 mph.

&&

LMZ740>745-222130-
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-
421 PM CDT Fri Jul 21 2017

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

.DAY ONE...Tonight.

  Significant Thunderstorm Risk.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday and Sunday...
  Limited Thunderstorm Risk.
Thursday...
  Limited Thunderstorm Risk.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-222130-
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-
421 PM CDT Fri Jul 21 2017

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

.DAY ONE...Tonight.

Thunderstorms are likely across the lake this evening and
overnight. Winds in excess of 30 kt are probable this evening,
mainly for the south half.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Low chances of thunderstorms exist for the weekend.

&&

Rodriguez

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In the hours before

Local storm report, Jul 21, 4:57 PM CDT, 25 minutes before
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Local storm report, Jul 21, 5:01 PM CDT, 21 minutes before
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Local storm report, Jul 21, 5:05 PM CDT, 17 minutes before
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Local storm report, Jul 21, 5:06 PM CDT, 16 minutes before
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Local storm report, Jul 21, 5:13 PM CDT, 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
513 PM CDT FRI JUL 21 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0458 PM     HAIL             WOOD DALE               41.97N 87.98W
07/21/2017  E1.00 INCH       DUPAGE             IL   TRAINED SPOTTER

&&

MDB
Local storm report, Jul 21, 5:15 PM CDT, 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
515 PM CDT FRI JUL 21 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0450 PM     HAIL             ELK GROVE VILLAGE       42.01N 87.99W
07/21/2017  M1.00 INCH       COOK               IL   PUBLIC

            QUARTER SIZED HAIL REPORTED IN ELK GROVE VILLAGE VIA
            FACEBOOK.

&&

ACLAYTON

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 12:30 AM CDTSpecial Weather StatementLOTLee30 min
Jul 21, 12:32 AM CDTSevere Thunderstorm WarningLOTDeKalb, LaSalle, Lee43 min
Jul 21, 12:57 AM CDTSevere Thunderstorm WarningLOTDeKalb, LaSalle14 min
Jul 21, 8:39 AM CDTRiver Flood AdvisoryLOTLaSalle5 days
Jul 21, 9:55 AM CDTRiver Flood WarningLOTWinnebago10 days
Jul 21, 9:55 AM CDTRiver Flood WarningLOTWinnebago11 days
Jul 21, 9:55 AM CDTRiver Flood WarningLOTOgle9 days
Jul 21, 2:39 PM CDTSevere Thunderstorm WarningLOTBoone, Winnebago36 min
Jul 21, 3:08 PM CDTSevere Thunderstorm WarningLOTBoone, DeKalb, McHenry37 min
Jul 21, 4:10 PM CDTRiver Flood AdvisoryLOTCook51 hr
Jul 21, 4:14 PM CDTSevere Thunderstorm WarningLOTCook, DuPage, Kane46 min
Jul 21, 4:41 PM CDTRiver Flood WarningLOTCook3 days
Jul 21, 4:41 PM CDTSevere Thunderstorm WarningLOTCook, DuPage49 min
Jul 21, 4:53 PM CDTRiver Flood WarningLOTLaSalle5 days
Jul 21, 5:00 PM CDTRiver Flood AdvisoryLOTWill51 hr
Jul 21, 5:00 PM CDTRiver Flood AdvisoryLOTWill66 hr
Jul 21, 5:00 PM CDTRiver Flood AdvisoryLOTDuPage40 hr
Jul 21, 5:06 PM CDTSpecial Marine WarningLOT84 min
Jul 21, 5:09 PM CDTRiver Flood WarningLOTBoone4 days
Jul 21, 5:18 PM CDTAreal Flood AdvisoryLOTCook, DuPage, Kane3 hr
Jul 21, 6:30 PM CDTSevere Thunderstorm WarningLOTOgle45 min
Jul 21, 6:39 PM CDTSevere Thunderstorm WarningLOTGrundy, Kankakee, Livingston, Will51 min
Jul 21, 2:34 AM CDTSpecial Weather StatementLOTBenton, Jasper, Newton41 min

Nearby

River Flood Warnings in Illinois, 2017Every 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.