Alert archive / Illinois / Flash Flood Warnings in 2021
Flash Flood Warning 2, NWS Chicago, IL
NWS Chicago, IL issued this flash flood warning at Jun 26, 2021, 3:50 PM CDT for 4 counties in Illinois; Lake County, Porter County, Indiana. It was in force for 6 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 26, 2021, 3:50 PM CDT (20:50 UTC)
- Expired
- Jun 26, 2021, 9:45 PM CDT
- In force
- 6 hr
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Flood severity
- None
Counties Cook County, IL, Grundy County, IL, Kankakee County, IL, Will County, IL, Lake County, IN, Porter County, IN
The radar
The Chicago radar (KLOT), 38 km from the middle of the area, began a volume at 20:49 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 26, 6:00 PM CDT | FLASH FLOOD | 1 Wnw Glenwood, IL | PHOTOS SHARED ON SOCIAL MEDIA SHOW GEORGE ARQUILLA PARK IN GLENWOOD FLOODED. |
| Jun 26, 6:00 PM CDT | FLASH FLOOD | 2 N Manhattan, IL | PARTS OF BAKER RD AND NELSON RD FLOODED NORTH OF MANHATTAN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 8.8 hours before the alert went out and 175 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 683 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 684 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 263 m²/s²
- 0-3 km storm-relative helicity
- 229 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.1
The text
As transmitted.
610
WGUS53 KLOT 262050
FFWLOT
ILC031-063-091-197-INC089-127-270245-
/O.NEW.KLOT.FF.W.0002.210626T2050Z-210627T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Chicago IL
350 PM CDT Sat Jun 26 2021
The National Weather Service in Chicago has issued a
* Flash Flood Warning for...
Southeastern Cook County in northeastern Illinois...
East Central Grundy County in northeastern Illinois...
Northeastern Kankakee County in northeastern Illinois...
Will County in northeastern Illinois...
Lake IN County in northwestern Indiana...
West Central Porter County in northwestern Indiana...
* Until 945 PM CDT.
* At 350 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have already fallen over the past few hours across parts of the
warned area, with additional thunderstorms producing torrential
rain moving into the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding.
SOURCE...Doppler radar.
IMPACT...Rapid-onset flooding of small creeks and streams,
urban areas, highways, streets and underpasses, as
well as other poor drainage and low lying areas.
* Some locations that will experience flash flooding include...
Chicago, Joliet, Hammond, Gary, Orland Park, Tinley Park, Oak
Lawn, Calumet City, Portage, Merrillville, Chicago Heights,
Roseland, Englewood, South Shore, East Chicago, Schererville,
Hobart, Lansing, Oak Forest and Crown Point.
Additional rainfall amounts of 1 to 3 inches are possible in the
warned area over the next 1 to 2 hours.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Flash Flood Warning means rapid-onset flooding is imminent or may
already be occurring. Persons along creeks, drainage ditches, and
other waterways should take immediate precautions to protect life
and property.
Expect flash flooding of creeks, ditches, canals, and storm sewers,
as well roadways, underpasses, farmland, and other poor drainage
areas.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4147 8825 4180 8758 4177 8748 4173 8747
4172 8746 4172 8740 4170 8737 4167 8737
4166 8735 4167 8721 4143 8722 4130 8753
4130 8801 4120 8801 4120 8825
FLASH FLOOD...RADAR INDICATED
$$
RC4 follow-up statements
947
WGUS73 KLOT 262221
FFSLOT
Flash Flood Statement
National Weather Service Chicago IL
521 PM CDT Sat Jun 26 2021
ILC031-063-091-197-INC089-127-270245-
/O.CON.KLOT.FF.W.0002.000000T0000Z-210627T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cook IL-Grundy IL-Kankakee IL-Will IL-Lake IN IN-Porter IN-
521 PM CDT Sat Jun 26 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM CDT THIS
EVENING FOR SOUTHEASTERN COOK, EAST CENTRAL GRUNDY, NORTHEASTERN
KANKAKEE, WILL, LAKE IN AND WEST CENTRAL PORTER COUNTIES...
At 521 PM CDT, Trained weather spotters and the public reported
flash flooding across the warned area, with radar indicating heavy
rain across portions of the warned area. Between 1 and 3 inches of
rain have already fallen. Flash flooding is ongoing or worsening.
HAZARD...Flash flooding.
SOURCE...Trained spotters and the public.
IMPACT...Rapid-onset flooding of small creeks and streams, urban
areas, highways, streets and underpasses, as well as
other poor drainage and low lying areas.
Some locations that will experience flash flooding include...
South Chicago, Joliet, Hammond, Gary, Orland Park, Tinley Park, Oak
Lawn, Calumet City, Portage, Merrillville, Chicago Heights,
Roseland, Englewood, South Shore, East Chicago, Schererville,
Hobart, Lansing, Oak Forest and Crown Point.
Additional rainfall amounts up to 1 inch are possible in the warned
area over the next hour.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Expect flash flooding of creeks, ditches, canals, and storm sewers,
as well roadways, underpasses, and other poor drainage areas.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4147 8825 4180 8758 4177 8748 4173 8747
4172 8746 4172 8740 4170 8737 4167 8737
4166 8735 4167 8721 4143 8722 4130 8753
4130 8801 4120 8801 4120 8825
FLASH FLOOD...OBSERVED
$$
RC680
WGUS73 KLOT 262357
FFSLOT
Flash Flood Statement
National Weather Service Chicago IL
657 PM CDT Sat Jun 26 2021
ILC031-063-091-197-INC089-127-270245-
/O.CON.KLOT.FF.W.0002.000000T0000Z-210627T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cook IL-Grundy IL-Kankakee IL-Will IL-Lake IN IN-Porter IN-
657 PM CDT Sat Jun 26 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM CDT THIS
EVENING FOR SOUTHEASTERN COOK, EAST CENTRAL GRUNDY, NORTHEASTERN
KANKAKEE, WILL, LAKE IN AND WEST CENTRAL PORTER COUNTIES...
At 657 PM CDT, Emergency management, trained spotters, and the
public reported flash flooding ongoing in the warned area. Between
1.5 and 3 inches of rain fell in a short period during the afternoon
across much of the warned area. The heavy rain has ended, but flash
flooding is likely to continue due to runoff and streams being out
of their banks.
HAZARD...Flash flooding.
SOURCE...Emergency management.
IMPACT...Rapid-onset flooding of small creeks and streams, urban
areas, highways, streets and underpasses, as well as
other poor drainage and low lying areas.
Some locations that will experience flash flooding include...
Chicago, Joliet, Hammond, Gary, Orland Park, Tinley Park, Oak
Lawn, Calumet City, Portage, Merrillville, Chicago Heights,
Roseland, Englewood, South Shore, East Chicago, Schererville,
Hobart, Lansing, Oak Forest and Crown Point.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Expect flooding of creeks, ditches, canals, and storm sewers, as
well roadways, underpasses, and other poor drainage areas.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles. Do not attempt to walk across any flooded
roads.
&&
LAT...LON 4147 8825 4180 8758 4177 8748 4173 8747
4172 8746 4172 8740 4170 8737 4167 8737
4166 8735 4167 8721 4143 8722 4130 8753
4130 8801 4120 8801 4120 8825
FLASH FLOOD...OBSERVED
$$
RC212
WGUS73 KLOT 270135
FFSLOT
Flash Flood Statement
National Weather Service Chicago IL
835 PM CDT Sat Jun 26 2021
ILC031-063-091-197-INC089-127-270245-
/O.CON.KLOT.FF.W.0002.000000T0000Z-210627T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cook IL-Grundy IL-Kankakee IL-Will IL-Lake IN IN-Porter IN-
835 PM CDT Sat Jun 26 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM CDT THIS
EVENING FOR SOUTHEASTERN COOK, EAST CENTRAL GRUNDY, NORTHEASTERN
KANKAKEE, WILL, LAKE IN AND WEST CENTRAL PORTER COUNTIES...
At 835 PM CDT, Emergency management, trained spotters, and the
public reported flash flooding ongoing in the warned area. Between
1.5 and 3 inches of rain fell in a short period during the afternoon
across much of the warned area. The heavy rain has ended, but flash
flooding is likely to continue due to runoff and streams being out
of their banks.
HAZARD...Flash flooding.
SOURCE...Trained spotters and the public.
IMPACT...Rapid-onset flooding of small creeks and streams, urban
areas, highways, streets and underpasses, as well as
other poor drainage and low lying areas.
Some locations that will experience flash flooding include...
South side of Chicago, Joliet, Hammond, Gary, Orland Park, Tinley
Park, Oak Lawn, Calumet City, Portage, Merrillville, Chicago
Heights, Roseland, Englewood, South Shore, East Chicago,
Schererville, Hobart, Lansing, Oak Forest and Crown Point.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Expect flooding of creeks, ditches, canals, and storm sewers, as
well roadways, underpasses, and other poor drainage areas.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles. Do not attempt to walk across any flooded
roads.
&&
LAT...LON 4147 8825 4180 8758 4177 8748 4173 8747
4172 8746 4172 8740 4170 8737 4167 8737
4166 8735 4167 8721 4143 8722 4130 8753
4130 8801 4120 8801 4120 8825
FLASH FLOOD...OBSERVED
$$
Kluber433
WGUS73 KLOT 270240
FFSLOT
Flash Flood Statement
National Weather Service Chicago IL
940 PM CDT Sat Jun 26 2021
ILC031-063-091-197-INC089-127-270250-
/O.EXP.KLOT.FF.W.0002.000000T0000Z-210627T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cook IL-Grundy IL-Kankakee IL-Will IL-Lake IN IN-Porter IN-
940 PM CDT Sat Jun 26 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 945 PM CDT THIS EVENING FOR
SOUTHEASTERN COOK, EAST CENTRAL GRUNDY, NORTHEASTERN KANKAKEE, WILL,
LAKE IN AND WEST CENTRAL PORTER COUNTIES...
The heavy rain has ended, with little to no additional rain expected
tonight. Where ongoing flooding impacts continue, a Flood Advisory
replaces the Flash Flood Warning. Please continue to heed remaining
road closures.
LAT...LON 4147 8825 4180 8758 4177 8748 4173 8747
4172 8746 4172 8740 4170 8737 4167 8737
4166 8735 4167 8721 4143 8722 4130 8753
4130 8801 4120 8801 4120 8825
$$
KluberThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 25, 8:01 PM CDT | Tornado Warning | LOT | Iroquois | 31 min |
| Jun 25, 8:11 PM CDT | Tornado Warning | LOT | Iroquois | 22 min |
| Jun 25, 8:37 PM CDT | Areal Flood Advisory | LOT | Ford, Iroquois, Kankakee, Livingston | 5 hr |
| Jun 25, 9:11 PM CDT | Special Weather Statement | LOT | Ford | 64 min |
| Jun 25, 10:39 PM CDT | Special Weather Statement | LOT | Ford | 66 min |
| Jun 26, 11:27 AM CDT | Tornado Warning | LOT | Livingston | 18 min |
| Jun 26, 11:34 AM CDT | Tornado Warning | LOT | Will | 26 min |
| Jun 26, 11:44 AM CDT | Tornado Warning | LOT | Grundy, LaSalle, Livingston | 36 min |
| Jun 26, 11:49 AM CDT | Tornado Warning | LOT | Cook | 26 min |
| Jun 26, 11:55 AM CDT | Special Marine Warning | LOT | 2 hr | |
| Jun 26, 12:18 PM CDT | Flash Flood Warning | LOT | Cook, DuPage, Will | 6 hr |
| Jun 26, 12:33 PM CDT | Special Marine Warning | LOT | 117 min | |
| Jun 26, 12:34 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 41 min |
| Jun 26, 12:59 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 11 min |
| Jun 26, 1:26 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 34 min |
| Jun 26, 2:08 PM CDT | Tornado Warning | LOT | Cook, Will | 25 min |
| Jun 26, 2:24 PM CDT | Special Marine Warning | LOT | 2 hr | |
| Jun 26, 2:43 PM CDT | Areal Flood Advisory | LOT | Cook, Ford, Grundy, Iroquois, Kankakee, LaSalle and 2 more | 6 hr |
| Jun 26, 3:31 PM CDT | Special Marine Warning | LOT | 119 min | |
| Jun 26, 3:34 PM CDT | Tornado Warning | LOT | Livingston | 41 min |
| Jun 26, 3:56 PM CDT | Tornado Warning | LOT | Kankakee, Will | 34 min |
| Jun 26, 3:57 PM CDT | Flash Flood Warning | LOT | Ford, Grundy, Iroquois, Kankakee, Livingston | 6 hr |
| Jun 26, 3:57 PM CDT | Tornado Warning | LOT | Grundy, Kankakee, Livingston | 33 min |
| Jun 26, 4:13 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Livingston | 47 min |
| Jun 26, 4:23 PM CDT | Tornado Warning | LOT | Ford, Livingston | 36 min |
| Jun 26, 4:26 PM CDT | River Flood Warning | LOT | Cook | 28 hr |
| Jun 26, 4:26 PM CDT | Tornado Warning | LOT | Cook, Will | 34 min |
| Jun 26, 4:30 PM CDT | Special Marine Warning | LOT | 2 hr | |
| Jun 26, 4:41 PM CDT | Tornado Warning | LOT | Kankakee | 34 min |
| Jun 26, 4:49 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Kankakee, Will | 56 min |
| Jun 26, 5:21 PM CDT | Severe Thunderstorm Warning | LOT | Will | 54 min |
| Jun 26, 5:44 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 76 min |
| Jun 26, 5:54 PM CDT | Areal Flood Advisory | LOT | Ford, Iroquois, Livingston | 3 hr |
| Jun 26, 6:23 PM CDT | Areal Flood Advisory | LOT | Cook, DuPage, Will | 7 hr |
| Jun 26, 6:55 PM CDT | River Flood Warning | LOT | Livingston | 3 days |
| Jun 26, 1:56 PM CDT | Special Weather Statement | LOT | Porter | 34 min |
| Jun 26, 2:27 PM CDT | Severe Thunderstorm Warning | LOT | Jasper, Lake, Newton, Porter | 48 min |
| Jun 26, 5:19 PM CDT | Tornado Warning | LOT | Lake, Porter | 13 min |
| Jun 26, 6:14 PM CDT | Severe Thunderstorm Warning | LOT | Benton, Jasper, Newton | 76 min |
Nearby
Flash Flood Warnings in Illinois, 2021Flash Flood Warnings in Indiana, 2021Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.