Alert archive / Illinois / River Flood Advisories in 2021

River Flood Advisory 1, NWS Chicago, IL

January 29, 2021Winnebago County, Illinois

NWS Chicago, IL issued this river flood advisory at Jan 29, 2021, 12:07 PM CST for Winnebago County, Illinois. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued: Jan 29, 2021, 12:07 PM CST (18:07 UTC)
Expired: Jan 30, 2021, 8:58 AM CST
In force: 21 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon

County Winnebago County, IL

The radar

The Milwaukee radar (KMKX), 86 km from the middle of the area, began a volume at 18:08 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 Latham Park (LATI2).

Action stage: 8 ft
Minor stage: 9 ft
Moderate stage: 11 ft
Major stage: 13.5 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 05437610, 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 advisory 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 advisory went out at Jan 29, 11:45 AM CST, 22 minutes earlier.

Area forecast discussion, Jan 29, 11:45 AM CST, 22 minutes before

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Hazardous weather outlook, Jan 29, 3:58 AM CST, 8 hours 9 minutes before

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
358 AM CST Fri Jan 29 2021

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-301000-
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-
358 AM CST Fri Jan 29 2021 /458 AM EST Fri Jan 29 2021/

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

.DAY ONE...Today and Tonight.

  No hazardous weather is expected at this time.

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

Saturday...
  Significant Snow Risk.
  Elevated Lakeshore Flood Risk for Illinois shore.
  Limited Non Thunderstorm Wind Risk.
  Limited Ice Accumulation Risk south of US-24 at night.
Sunday...
  Elevated Snow Risk in the morning.
  Elevated Lakeshore Flood Risk for Illinois shore.
  Limited Non Thunderstorm Wind Risk.
  Limited Ice Accumulation Risk south of US-24 early.

DISCUSSION:

A winter storm is likely to impact the region mid to late
Saturday afternoon into Sunday. Moderate to heavy snow, especially
late day Saturday through the early overnight, will likely bring
significant snow accumulations, and easterly winds gusting up to
30-35 mph will likely exacerbate the impacts.

The gusty easterly winds will bring a threat for minor lakeshore
flooding along the Illinois shore of Lake Michigan late Saturday
afternoon through early Sunday morning.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

LMZ740>745-301000-
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-
358 AM CST Fri Jan 29 2021

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...Today and Tonight.

Weather hazards expected...

  Hazardous conditions for small craft for the Illinois
  nearshore late tonight.

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

Saturday through Monday...
  Hazardous conditions for small craft are likely, including
  a period of possible gales Saturday night.

Tuesday through Thursday...
  Hazardous conditions for small craft are possible.

Castro/MTF

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 29, 3:20 AM CST	Small Craft Advisory	LOT		5 days
Jan 29, 3:23 AM CST	Winter Storm Watch	LOT	Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more	24 hr
Jan 29, 2:22 PM CST	Gale Warning	LOT		43 hr
Jan 29, 2:22 PM CST	Small Craft Advisory	LOT		4 days
Jan 29, 2:38 PM CST	Winter Storm Warning	LOT	Boone, Cook, DeKalb, DuPage, Grundy, Iroquois and 10 more	51 hr
Jan 29, 2:43 PM CST	Lakeshore Flood Advisory	LOT	Cook, Lake	60 hr

Nearby

River Flood Advisories in Illinois, 2021 Every river flood advisory in 2021

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.