Flood Watch

NWS Chicago IL · US

Updated

This event was updated at 2026-09-20 18:17:00 UTC.

Details

Flood Watch Remains In Effect Until 7 AM CDT Sunday

Event: Flood Watch
Issued: 2026-09-20 01:23:00 UTC
Onset: 2026-09-20 01:23:00 UTC
Message expires: 2026-09-20 09:30:00 UTC
Expected end: 2026-09-20 12:00:00 UTC
Category: Meteorological
Urgency: Future
Severity: Severe
Certainty: Possible
Response: Prepare

Description

What

Flash flooding caused by excessive rainfall continues to be possible.

Where

Portions of Illinois, including the following areas, Boone, Central Cook, De Kalb, DuPage, Kane, Kendall, Lake IL, Lee, McHenry, Northern Cook, Northern Will, Ogle, Southern Cook and Winnebago and northwest Indiana, including the following areas, Lake IN and Porter.

When

Until 7 AM CDT Sunday.

Impacts

Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Underpasses may be flooded. Roads and streets may be flooded.

Additional details

- Another round of showers and thunderstorms is expected late this evening and overnight. Swaths of heavy to very heavy rainfall with 2+ inch per hour rainfall rates are likely to occur within the watch area and may result in areas of flash flooding and cause rapid rises on area rivers, creeks, and streams. - http://www.weather.gov/safety/flood

Instructions

A Flood Watch for flash flooding means rapid-onset flooding is possible, but not yet certain, based upon the latest forecasts. Flash flooding is a dangerous situation. Persons with interests along area rivers, creeks, and other waterways should monitor the latest forecasts and be prepared to take action should flooding develop.

Affected areas

Winnebago County, IL
Boone County, IL
McHenry County, IL
Lake
Ogle County, IL
Lee County, IL
De Kalb
Kane County, IL
DuPage County, IL
Kendall County, IL
Northern Cook
Central Cook
Southern Cook
Northern Will
Lake
Porter County, IN

Public contact

Issuer: NWS Chicago IL
Website: http://www.weather.gov

Message record

Received: 2026-09-20 01:23:45 UTC
Issue to receipt: ~45s
CAP status: Actual
CAP message type: Update
Lifecycle: Updated
Source: NWWS-OI
Feed: NWWS
Recovered: No

CAP routing and identity

ULID: 01M2Y6JZ79SR60AJKR8XVRZV7T
Identifier: urn:oid:2.49.0.1.840.0.fe53a27e463fdbff4212f7fb648a6aa3dc611c2d.002.1
Sender: w-nws.webmaster@noaa.gov
Scope: Public
CAP source: 211803 v2.3.0
Handling codes: IPAWSv1.0
Issuing office: NWS Chicago IL
AWIPS ID: CAPLOT
NWWS sequence: nwws_processor.2293
WMO heading: XOUS53
WMO data type: CAP alert message XML (XO)
WMO geography: United States (US)
WMO bulletin number: 53

References

Identifier: urn:oid:2.49.0.1.840.0.193b7c292302f4bcfe2b0778e2a4305f8afd6ddf.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-19 20:57:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.cae5ec79914e610b53719c596cc2a6100ee1c665.002.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-19 15:34:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.cae5ec79914e610b53719c596cc2a6100ee1c665.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-19 15:34:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.fc9a4929fd3a6ab812a4ac4d5f02d2d68cc0f6ac.002.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-19 08:39:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.fc9a4929fd3a6ab812a4ac4d5f02d2d68cc0f6ac.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-19 08:39:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.93311e257cfccf9da891a3445204312069e25e8d.002.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-19 02:49:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.93311e257cfccf9da891a3445204312069e25e8d.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-19 02:49:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.645564b2ad5278c50a8b5452c909e42c2ebbc27c.002.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-18 18:47:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.645564b2ad5278c50a8b5452c909e42c2ebbc27c.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-18 18:47:00 UTC

Event codes

Name	Value
SAME	FFA
NationalWeatherService	FAA

Parameters

Name	Value
AWIPSidentifier	FFALOT
WMOidentifier	WGUS63 KLOT 200123
NWSheadline	FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT SUNDAY
BLOCKCHANNEL	EAS
BLOCKCHANNEL	NWEM
EAS-ORG	WXR
VTEC	/O.CON.KLOT.FA.A.0016.000000T0000Z-260920T1200Z/
eventEndingTime	2026-09-20T07:00:00-05:00
BLOCKCHANNEL	CMAS
expiredReferences	w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.cae5ec79914e610b53719c596cc2a6100ee1c665.002.1,2026-09-19T10:34:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.cae5ec79914e610b53719c596cc2a6100ee1c665.001.1,2026-09-19T10:34:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.fc9a4929fd3a6ab812a4ac4d5f02d2d68cc0f6ac.002.1,2026-09-19T03:39:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.fc9a4929fd3a6ab812a4ac4d5f02d2d68cc0f6ac.001.1,2026-09-19T03:39:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.93311e257cfccf9da891a3445204312069e25e8d.002.1,2026-09-18T21:49:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.93311e257cfccf9da891a3445204312069e25e8d.001.1,2026-09-18T21:49:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.645564b2ad5278c50a8b5452c909e42c2ebbc27c.002.1,2026-09-18T13:47:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.645564b2ad5278c50a8b5452c909e42c2ebbc27c.001.1,2026-09-18T13:47:00-05:00

Locations

Location data

Winnebago County, IL
Boone County, IL
McHenry County, IL
Lake
Ogle County, IL
Lee County, IL
De Kalb
Kane County, IL
DuPage County, IL
Kendall County, IL
Northern Cook
Central Cook
Southern Cook
Northern Will
Lake
Porter County, IN

Name	Value
SAME	017201
SAME	017007
SAME	017111
SAME	017097
SAME	017141
SAME	017103
SAME	017037
SAME	017089
SAME	017043
SAME	017093
SAME	017031
SAME	017197
SAME	018089
SAME	018127
UGC	ILZ003
UGC	ILZ004
UGC	ILZ005
UGC	ILZ006
UGC	ILZ008
UGC	ILZ010
UGC	ILZ011
UGC	ILZ012
UGC	ILZ013
UGC	ILZ020
UGC	ILZ103
UGC	ILZ104
UGC	ILZ105
UGC	ILZ106
UGC	INZ001
UGC	INZ002