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Home Return to list Areal Flood Advisory 0120 Issued by the Chicago Forecast Office
Action: New Issued At: 2026-09-19 03:29:44
848
WGUS83 KLOT 190829
FLSLOT
Flood Advisory
National Weather Service Chicago IL
329 AM CDT Sat Sep 19 2026
ILC007-097-111-201-191400-
/O.NEW.KLOT.FA.Y.0120.260919T0829Z-260919T1400Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Boone IL-Lake IL-McHenry IL-Winnebago IL-
329 AM CDT Sat Sep 19 2026
...FLOOD ADVISORY IN EFFECT UNTIL 9 AM CDT THIS MORNING...
* WHAT...Flooding caused by excessive rainfall is expected.
* WHERE...Boone County in north central Illinois...
Winnebago County in north central Illinois...
Lake IL County in northeastern Illinois...
McHenry County in northeastern Illinois...
* WHEN...Until 900 AM CDT.
* IMPACTS...Creeks and streams may rise out of their banks. Flooding
may occur in poor drainage and urban areas.
* ADDITIONAL DETAILS...
- At 324 AM CDT, Doppler radar indicated heavy rain due to
thunderstorms producing rainfall amounts in excess of one inch
per hour. Minor flooding is ongoing or expected to begin shortly
in the advisory area. One to two inches of rain has fallen.
- Additional rainfall amounts of one to two inches are expected
over the area. This additional rain will result in minor
flooding.
- Some locations that will experience flooding include...
Rockford, Waukegan, Buffalo Grove, Crystal Lake, Wheeling, North
Chicago, Gurnee, Mundelein, Algonquin, Highland Park, Lake in the
Hills, Round Lake Beach, McHenry, Belvidere, Vernon Hills,
Woodstock, Zion, Huntley, Loves Park, Machesney Park, Grayslake
and Libertyville.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Flood Advisory means minor flooding along waterways and other poor
drainage areas is imminent or may already be occurring. Persons in
the advisory area should use caution and avoid flood waters.
&&
LAT...LON 4249 8780 4247 8779 4238 8779 4229 8782
4215 8775 4215 8917 4220 8917 4220 8940
4250 8940
$$
Ratzer
Action: Continued Issued At: 2026-09-19 07:00:09
393
WGUS83 KLOT 191159
FLSLOT
Flood Advisory
National Weather Service Chicago IL
659 AM CDT Sat Sep 19 2026
ILC007-097-111-201-191400-
/O.CON.KLOT.FA.Y.0120.000000T0000Z-260919T1400Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Boone IL-Lake IL-McHenry IL-Winnebago IL-
659 AM CDT Sat Sep 19 2026
...FLOOD ADVISORY REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING...
* WHAT...Flooding caused by excessive rainfall continues.
* WHERE...Boone County in north central Illinois...
Winnebago County in north central Illinois...
Lake IL County in northeastern Illinois...
McHenry County in northeastern Illinois...
* WHEN...Until 900 AM CDT.
* IMPACTS...Creeks and streams may rise out of their banks. Flooding
may occur in poor drainage and urban areas.
* ADDITIONAL DETAILS...
- At 657 AM CDT, Doppler radar indicated heavy rain due to
thunderstorms earlier this morning, with additional steady rain
and embedded thunderstorms currently over or near the area. Minor
flooding is expected to continue in the advisory area.
- Additional rainfall amounts up to 1 inch are possible over the
area. This additional rain will result in minor flooding.
- Some locations that will experience flooding include...
Rockford, Waukegan, Buffalo Grove, Crystal Lake, Wheeling, North
Chicago, Gurnee, Mundelein, Algonquin, Highland Park, Lake in the
Hills, Round Lake Beach, McHenry, Belvidere, Vernon Hills,
Woodstock, Zion, Huntley, Loves Park, Machesney Park, Grayslake
and Libertyville.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Flood Advisory means minor flooding along waterways and other poor
drainage areas is imminent or may already be occurring. Persons in
the advisory area should use caution and avoid flood waters.
&&
LAT...LON 4249 8780 4247 8779 4238 8779 4229 8782
4215 8775 4215 8917 4220 8917 4220 8940
4250 8940
$$
Kluber
Action: Continued Issued At: 2026-09-19 08:42:12
546
WGUS83 KLOT 191341
FLSLOT
Flood Advisory
National Weather Service Chicago IL
841 AM CDT Sat Sep 19 2026
ILC097-191351-
/O.CAN.KLOT.FA.Y.0120.000000T0000Z-260919T1400Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lake IL-
841 AM CDT Sat Sep 19 2026
...FLOOD ADVISORY IS CANCELLED...
The Flood Advisory is cancelled for a portion of northeast Illinois,
including the following area, Lake IL.
Though steady rain is ongoing, higher rainfall rates with
thunderstorms will remain south of the area. Flooding is no longer
expected to pose a threat.
A Flood Watch remains in effect until 100 PM CDT for portions of
Illinois and northwest Indiana.
A Flood Watch remains in effect until 100 PM CDT for portions of
north central and northeast Illinois...
&&
LAT...LON 4234 8940 4249 8820 4231 8820 4215 8917
4220 8917 4220 8940
$$
ILC007-111-201-191400-
/O.CON.KLOT.FA.Y.0120.000000T0000Z-260919T1400Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Boone IL-McHenry IL-Winnebago IL-
841 AM CDT Sat Sep 19 2026
...FLOOD ADVISORY REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING...
* WHAT...Flooding caused by excessive rainfall continues.
* WHERE...Boone County in north central Illinois...
Southern Winnebago County in north central Illinois...
Central McHenry County in northeastern Illinois...
* WHEN...Until 900 AM CDT.
* IMPACTS...Creeks and streams may rise out of their banks. Flooding
may occur in poor drainage and urban areas.
* ADDITIONAL DETAILS...
- At 838 AM CDT, Doppler radar indicated heavy rain due to
thunderstorms earlier this morning and current steady rain over
the area. Minor flooding is expected to continue in the advisory
area.
- Additional rainfall amounts up to 1 inch are expected over the
area. This additional rain will result in minor flooding.
- Some locations that will experience flooding include...
Rockford, McHenry, Belvidere, Woodstock, Loves Park, Machesney
Park, Fox Lake, Harvard, Marengo, Poplar Grove, Rockford Airport,
Johnsburg, Lakemoor, Spring Grove, Candlewick Lake, Wonder Lake,
Pistakee Highlands, Cherry Valley, Winnebago, Pecatonica,
Richmond, Capron and Hebron.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Flood Advisory means minor flooding along waterways and other poor
drainage areas is imminent or may already be occurring. Persons in
the advisory area should use caution and avoid flood waters.
&&
LAT...LON 4234 8940 4249 8820 4231 8820 4215 8917
4220 8917 4220 8940
$$
Kluber
Action: Cancelled Issued At: 2026-09-19 08:42:12
546
WGUS83 KLOT 191341
FLSLOT
Flood Advisory
National Weather Service Chicago IL
841 AM CDT Sat Sep 19 2026
ILC097-191351-
/O.CAN.KLOT.FA.Y.0120.000000T0000Z-260919T1400Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lake IL-
841 AM CDT Sat Sep 19 2026
...FLOOD ADVISORY IS CANCELLED...
The Flood Advisory is cancelled for a portion of northeast Illinois,
including the following area, Lake IL.
Though steady rain is ongoing, higher rainfall rates with
thunderstorms will remain south of the area. Flooding is no longer
expected to pose a threat.
A Flood Watch remains in effect until 100 PM CDT for portions of
Illinois and northwest Indiana.
A Flood Watch remains in effect until 100 PM CDT for portions of
north central and northeast Illinois...
&&
LAT...LON 4234 8940 4249 8820 4231 8820 4215 8917
4220 8917 4220 8940
$$
ILC007-111-201-191400-
/O.CON.KLOT.FA.Y.0120.000000T0000Z-260919T1400Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Boone IL-McHenry IL-Winnebago IL-
841 AM CDT Sat Sep 19 2026
...FLOOD ADVISORY REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING...
* WHAT...Flooding caused by excessive rainfall continues.
* WHERE...Boone County in north central Illinois...
Southern Winnebago County in north central Illinois...
Central McHenry County in northeastern Illinois...
* WHEN...Until 900 AM CDT.
* IMPACTS...Creeks and streams may rise out of their banks. Flooding
may occur in poor drainage and urban areas.
* ADDITIONAL DETAILS...
- At 838 AM CDT, Doppler radar indicated heavy rain due to
thunderstorms earlier this morning and current steady rain over
the area. Minor flooding is expected to continue in the advisory
area.
- Additional rainfall amounts up to 1 inch are expected over the
area. This additional rain will result in minor flooding.
- Some locations that will experience flooding include...
Rockford, McHenry, Belvidere, Woodstock, Loves Park, Machesney
Park, Fox Lake, Harvard, Marengo, Poplar Grove, Rockford Airport,
Johnsburg, Lakemoor, Spring Grove, Candlewick Lake, Wonder Lake,
Pistakee Highlands, Cherry Valley, Winnebago, Pecatonica,
Richmond, Capron and Hebron.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Flood Advisory means minor flooding along waterways and other poor
drainage areas is imminent or may already be occurring. Persons in
the advisory area should use caution and avoid flood waters.
&&
LAT...LON 4234 8940 4249 8820 4231 8820 4215 8917
4220 8917 4220 8940
$$
Kluber
Action: Time Extended Issued At: 2026-09-19 08:46:43
799
WGUS83 KLOT 191346
FLSLOT
Flood Advisory
National Weather Service Chicago IL
846 AM CDT Sat Sep 19 2026
ILC007-111-201-191600-
/O.EXT.KLOT.FA.Y.0120.000000T0000Z-260919T1600Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Boone IL-McHenry IL-Winnebago IL-
846 AM CDT Sat Sep 19 2026
...FLOOD ADVISORY NOW IN EFFECT UNTIL 11 AM CDT THIS MORNING...
* WHAT...Flooding caused by excessive rainfall continues.
* WHERE...Boone County in north central Illinois...
Southern Winnebago County in north central Illinois...
Central McHenry County in northeastern Illinois...
* WHEN...Until 1100 AM CDT.
* IMPACTS...Creeks and streams may rise out of their banks. Flooding
may occur in poor drainage and urban areas.
* ADDITIONAL DETAILS...
- At 844 AM CDT, Doppler radar and automated rain gauges indicated
heavy rain due to thunderstorms earlier this morning and current
steady rain over the area. Minor flooding is expected to continue
in the advisory area.
- Additional rainfall amounts up to 1 inch are possible over the
area. This additional rain will result in minor flooding.
- Some locations that will experience flooding include...
Rockford, McHenry, Belvidere, Woodstock, Loves Park, Machesney
Park, Roscoe, Fox Lake, Harvard, Marengo, Poplar Grove, Rockford
Airport, Johnsburg, Lakemoor, Spring Grove, Candlewick Lake,
Wonder Lake, Pistakee Highlands, Cherry Valley, Winnebago,
Pecatonica, Richmond, Capron and Hebron.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Flood Advisory means minor flooding along waterways and other poor
drainage areas is imminent or may already be occurring. Persons in
the advisory area should use caution and avoid flood waters.
&&
LAT...LON 4240 8894 4249 8820 4231 8820 4215 8917
4220 8917 4220 8940 4234 8940
$$
Kluber
Action: Expired Issued At: 2026-09-19 10:56:47
822
WGUS83 KLOT 191556
FLSLOT
Flood Advisory
National Weather Service Chicago IL
1056 AM CDT Sat Sep 19 2026
ILC007-111-201-191606-
/O.EXP.KLOT.FA.Y.0120.000000T0000Z-260919T1600Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Boone IL-McHenry IL-Winnebago IL-
1056 AM CDT Sat Sep 19 2026
...FLOOD ADVISORY WILL EXPIRE AT 11 AM CDT THIS MORNING...
The Flood Advisory will expire at 11 AM CDT this morning for portions
of north central and northeast Illinois, including the following
areas, in north central Illinois, Boone and Winnebago. In northeast
Illinois, McHenry.
Flooding is no longer expected to pose a threat this morning. Please
continue to heed remaining road closures.
Another period of thunderstorms with torrential rainfall is possible
tonight. A Flood Watch remains in effect until 700 AM CDT Sunday for
portions of Illinois and northwest Indiana...
&&
LAT...LON 4240 8894 4249 8820 4231 8820 4215 8917
4220 8917 4220 8940 4234 8940
$$
Kluber
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