Alert archive / Illinois / River Flood Warnings in 2020

River Flood Warning 92, NWS Chicago, IL

May 24, 2020Kane County, Kendall County, Illinois

NWS Chicago, IL issued this river flood warning at May 24, 2020, 12:42 AM CDT for Kane County, Kendall County, Illinois. It took effect at May 24, 2020, 6:33 AM CDT. It was in force for 66 hr.

The area

The counties it named.

The facts

Issued
May 24, 2020, 12:42 AM CDT (05:42 UTC)
In effect from
May 24, 2020, 6:33 AM CDT
Expired
May 27, 2020, 1:00 AM CDT
In force
66 hr
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Flood severity
Minor

Counties Kane County, IL, Kendall County, IL

The radar

The Chicago radar (KLOT), 34 km from the middle of the area, began a volume at 05:43 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 Fox River at Montgomery (MNGI2). The gauge peaked at 13.68 ft at May 24, 2020, 9:00 AM CDT.

actionminormoderatemajor121314151605/2405/2505/2605/2705/28
Action stage
13 ft
Minor stage
13.5 ft
Moderate stage
15 ft
Major stage
16 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 05551540, 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 May 23, 6:37 PM CDT, 6 hours 5 minutes earlier.

Area forecast discussion, May 23, 6:37 PM CDT, 6 hours 5 minutes before
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Hazardous weather outlook, May 23, 5:09 PM CDT, 7 hours 33 minutes before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
509 PM CDT Sat May 23 2020

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-242215-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
509 PM CDT Sat May 23 2020 /609 PM EDT Sat May 23 2020/

This Hazardous Weather Outlook is for portions of North Central
Illinois...Northeast Illinois and Northwest Indiana.

.DAY ONE...Tonight.

Weather hazards expected...

  Significant Thunderstorm Risk...with an associated:
     Elevated Tornado risk.
     Elevated hail risk...up to golf ball size.
     Elevated damaging wind risk...up to 70 mph.
  Limited Flooding Risk.

DISCUSSION...

Scattered strong to severe thunderstorms will continue across
the area through early this evening. These are likely to move out
of northern Illinois by 8 to 9 p.m. and northwest Indiana by
10 p.m., though scattered storms may linger in eastern Illinois
and northwest Indiana into early overnight.

The primary severe threat are tornadoes, large hail, and damaging
winds. Given the wet conditions of late and elevated river levels,
very heavy downpours from thunderstorms will be capable of
producing isolated to instances of flash flooding, along with
renewed river and stream rises. After the primary severe and
flooding threat ends, the potential exists for thunderstorms to
focus east of I-57 into the early overnight, which could prolong
the flooding risk for those areas, especially in northwest
Indiana.

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

Sunday and Monday...
  Limited Thunderstorm Risk.
Tuesday and Wednesday...
  Significant Thunderstorm Risk.
Thursday...
  Elevated Thunderstorm Risk.
Friday...
  Limited Thunderstorm Risk.

DISCUSSION:

There will be daily scattered thunderstorm chances amidst very
warm and humid conditions Sunday through Tuesday, with possibly
higher coverage of thunderstorms by mid week. Any thunderstorms
will be capable of producing heavy downpours and possibly an
isolated flooding risk. Thunderstorm chances may be limited to
areas south of I-80 or south of there by Thursday and especially
Friday.

.SPOTTER INFORMATION STATEMENT...

  Spotters will continue to be needed through early evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east northeast at 30 to 35 mph.

LMZ740>745-242215-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
509 PM CDT Sat May 23 2020

This Hazardous Weather Outlook is for portions of the Illinois
nearshore waters of Lake Michigan and the Indiana nearshore
waters of Lake Michigan.

.DAY ONE...Tonight.

Weather hazards expected...

  Significant Thunderstorm Risk...with an associated:
     Limited Waterspout Risk.
     Elevated hail risk...up to ping pong ball size.
     Limited thunderstorm wind gust risk...up to 40 kt.
  Elevated Fog Risk.

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

Sunday...
  Limited Thunderstorm Risk.
  Elevated Fog Risk.
Monday...
  Limited Thunderstorm Risk.
Tuesday...
  Elevated Thunderstorm Risk.
Wednesday...
  Significant Thunderstorm Risk.
Thursday and Friday...
  Limited Thunderstorm Risk.

MTF

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In the hours before

Local storm report, May 23, 6:44 PM CDT, 5 hours 58 minutes before
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Local storm report, May 23, 6:47 PM CDT, 5 hours 55 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 23, 7:02 PM CDTSpecial Marine WarningLOT118 min
May 23, 7:37 PM CDTAreal Flood AdvisoryLOTCook, Lake3 hr
May 23, 9:20 PM CDTRiver Flood AdvisoryLOTBoone64 hr
May 23, 9:20 PM CDTRiver Flood AdvisoryLOTWinnebago3 days
May 23, 9:20 PM CDTRiver Flood AdvisoryLOTOgle4 days
May 23, 11:57 PM CDTRiver Flood AdvisoryLOTCook7 hr
May 24, 12:38 AM CDTRiver Flood AdvisoryLOTCook16 hr
May 24, 12:43 AM CDTRiver Flood AdvisoryLOTLaSalle3 days
May 24, 8:43 AM CDTRiver Flood WarningLOTLaSalle25 hr
May 24, 8:57 AM CDTRiver Flood AdvisoryLOTGrundy25 hr
May 24, 9:01 AM CDTRiver Flood AdvisoryLOTWinnebago21 hr
May 24, 9:17 AM CDTRiver Flood AdvisoryLOTWinnebago16 hr
May 24, 3:52 PM CDTRiver Flood AdvisoryLOTKankakee13 hr
May 23, 7:33 PM CDTSevere Thunderstorm WarningLOTLake, Porter72 min
May 23, 7:42 PM CDTRiver Flood WarningLOTLake10 hr
May 23, 7:54 PM CDTAreal Flood AdvisoryLOTLake, Porter3 hr
May 23, 8:06 PM CDTFlash Flood WarningLOTPorter4 hr
May 24, 8:41 AM CDTRiver Flood WarningLOTLake, Newton4 days
May 24, 3:52 PM CDTRiver Flood AdvisoryLOTJasper, Porter17 hr

Nearby

River Flood Warnings in Illinois, 2020Every river flood warning in 2020

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.