Alert archive / Illinois / Flash Flood Warnings in 2021

Flash Flood Warning 3, NWS Chicago, IL

June 26, 20215 counties in Illinois; Lake County, Indiana

NWS Chicago, IL issued this flash flood warning at Jun 26, 2021, 3:57 PM CDT for 5 counties in Illinois; Lake 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, 3:57 PM CDT (20:57 UTC)
Expired
Jun 26, 2021, 10:00 PM CDT
In force
6 hr
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Flood severity
None

Counties Ford County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Livingston County, IL, Lake County, IN

The radar

The Chicago radar (KLOT), 83 km from the middle of the area, began a volume at 21:01 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

TimeReportWhereRemark
Jun 26, 6:00 PM CDTFLASH FLOOD1 E Saunemin, ILROUTE 116 NEAR SAUNEMIN CLOSED DUE TO FLOODING.
Jun 26, 6:00 PM CDTFLASH FLOOD3 W Chatsworth, ILE 900 RD N BETWEEN FORREST AND CHATSWORTH CLOSED DUE TO FLOODING.

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, 9.0 hours before the alert went out and 85 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.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2021-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 683 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2021-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 263 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

The text

As transmitted.

603 
WGUS53 KLOT 262057
FFWLOT
ILC053-063-075-091-105-INC089-270300-
/O.NEW.KLOT.FF.W.0003.210626T2057Z-210627T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Chicago IL
357 PM CDT Sat Jun 26 2021

The National Weather Service in Chicago has issued a

* Flash Flood Warning for...
  Livingston County in central Illinois...
  Western Ford County in east central Illinois...
  Northwestern Iroquois County in east central Illinois...
  Southeastern Grundy County in northeastern Illinois...
  Kankakee County in northeastern Illinois...
  Southwestern Lake IN County in northwestern Indiana...

* Until 1000 PM CDT Saturday.

* At 357 PM CDT, doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. 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...
  Kankakee, Bourbonnais, Bradley, Channahon, Pontiac, Manteno, 
  Braidwood, Coal City, Dwight, Fairbury, Gibson City, Momence, 
  Herscher, Clifton, Chatsworth, Diamond, Limestone, Gardner, Grant 
  Park and Forrest.

Additional rainfall amounts of 1 to 3 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

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.

&&

LAT...LON 4075 8891 4142 8825 4120 8824 4121 8801
      4129 8800 4130 8752 4040 8844 4040 8846
      4061 8846 4061 8857 4076 8858

FLASH FLOOD...RADAR INDICATED

$$

Birk
4 follow-up statements
193 
WGUS73 KLOT 262234
FFSLOT

Flash Flood Statement
National Weather Service Chicago IL
534 PM CDT Sat Jun 26 2021

ILC053-063-075-091-105-INC089-270300-
/O.CON.KLOT.FF.W.0003.000000T0000Z-210627T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ford IL-Grundy IL-Iroquois IL-Kankakee IL-Livingston IL-Lake IN IN-
534 PM CDT Sat Jun 26 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 PM CDT THIS 
EVENING FOR LIVINGSTON, WESTERN FORD, NORTHWESTERN IROQUOIS, 
SOUTHEASTERN GRUNDY, KANKAKEE AND SOUTHWESTERN LAKE IN COUNTIES...

At 534 PM CDT, Doppler radar estimated that between 2 and 4 inches 
of rain have fallen this afternoon in addition to several inches of 
rain over the past few days. Flash flooding is likely ongoing across 
much of the warned area. The heavy rain has ended across most of the 
warned area, with light to moderate rain occurring.

HAZARD...Flash flooding.

SOURCE...Doppler radar.

IMPACT...Rapid-onset flooding of small creeks and streams, urban
         areas, highways, streets and underpasses, farmland, and
         other poor drainage and low lying areas.

Some locations that will experience flash flooding include...
  Kankakee, Bourbonnais, Bradley, Channahon, Pontiac, Manteno, 
  Braidwood, Coal City, Dwight, Fairbury, Gibson City, Momence, 
  Herscher, Clifton, Chatsworth, Diamond, Limestone, Gardner, Grant 
  Park and Forrest.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles. Do not attempt to walk across any flooded 
roads or fields.

&&

LAT...LON 4075 8891 4142 8825 4120 8824 4121 8801
      4129 8800 4130 8752 4040 8844 4040 8846
      4061 8846 4061 8857 4076 8858

FLASH FLOOD...RADAR INDICATED

$$

RC
934 
WGUS73 KLOT 262334
FFSLOT

Flash Flood Statement
National Weather Service Chicago IL
634 PM CDT Sat Jun 26 2021

ILC053-063-075-091-105-INC089-270300-
/O.CON.KLOT.FF.W.0003.000000T0000Z-210627T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ford IL-Grundy IL-Iroquois IL-Kankakee IL-Livingston IL-Lake IN IN-
634 PM CDT Sat Jun 26 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 PM CDT THIS 
EVENING FOR LIVINGSTON, WESTERN FORD, NORTHWESTERN IROQUOIS, 
SOUTHEASTERN GRUNDY, KANKAKEE AND SOUTHWESTERN LAKE IN COUNTIES...

At 634 PM CDT, Trained weather spotters reported flash flooding 
occurring in Chatsworth. Between 2 and 4 inches of rain fell during 
the afternoon in addition to the several inches of rain that fell 
over the past few days. Flash flooding is ongoing across much of the 
warned area.

HAZARD...Flash flooding.

SOURCE...Trained spotters.

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...
  Kankakee, Bourbonnais, Bradley, Channahon, Pontiac, Manteno, 
  Braidwood, Coal City, Dwight, Fairbury, Gibson City, Momence, 
  Herscher, Clifton, Chatsworth, Diamond, Limestone, Gardner, Grant 
  Park and Forrest.

Rivers and streams around Chatsworth are out of their banks and 
numerous roads are barricaded.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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. Do not attempt to walk across any flooded 
roads or fields.

&&

LAT...LON 4075 8891 4142 8825 4120 8824 4121 8801
      4129 8800 4130 8752 4040 8844 4040 8846
      4061 8846 4061 8857 4076 8858

FLASH FLOOD...OBSERVED

$$

RC
216 
WGUS73 KLOT 270148
FFSLOT

Flash Flood Statement
National Weather Service Chicago IL
848 PM CDT Sat Jun 26 2021

ILC053-063-075-091-105-INC089-270300-
/O.CON.KLOT.FF.W.0003.000000T0000Z-210627T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ford IL-Grundy IL-Iroquois IL-Kankakee IL-Livingston IL-Lake IN IN-
848 PM CDT Sat Jun 26 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 PM CDT THIS 
EVENING FOR LIVINGSTON, NORTH CENTRAL FORD, NORTHWESTERN IROQUOIS, 
SOUTHEASTERN GRUNDY, KANKAKEE AND SOUTHWESTERN LAKE IN COUNTIES...

At 848 PM CDT, Trained weather spotters reported flash flooding 
occurring in portions of the warned area. Between 2 and 4 inches of 
rain fell during the afternoon in addition to the several inches of 
rain that fell over the past few days.

HAZARD...Flash flooding.

SOURCE...Trained spotters.

IMPACT...Rapid-onset flooding of small creeks and streams, urban
         areas, highways, streets and underpasses, farmland, and
         other poor drainage and low lying areas.

Some locations that will experience flash flooding include...
  Kankakee, Bourbonnais, Bradley, Channahon, Pontiac, Manteno, 
  Braidwood, Coal City, Dwight, Fairbury, Herscher, Chatsworth, 
  Diamond, Limestone, Gardner, Grant Park, Forrest, Odell, Mazon and 
  Braceville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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. Do not attempt to walk across any flooded 
roads or fields.

&&

LAT...LON 4075 8891 4142 8825 4120 8824 4121 8801
      4129 8800 4130 8752 4061 8846 4061 8857
      4076 8858

FLASH FLOOD...OBSERVED

$$

Kluber
036 
WGUS73 KLOT 270255
FFSLOT

Flash Flood Statement
National Weather Service Chicago IL
955 PM CDT Sat Jun 26 2021

ILC053-063-075-091-105-INC089-270305-
/O.EXP.KLOT.FF.W.0003.000000T0000Z-210627T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ford IL-Grundy IL-Iroquois IL-Kankakee IL-Livingston IL-Lake IN IN-
955 PM CDT Sat Jun 26 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 10 PM CDT THIS EVENING FOR 
LIVINGSTON, NORTH CENTRAL FORD, NORTHWESTERN IROQUOIS, SOUTHEASTERN 
GRUNDY, KANKAKEE AND SOUTHWESTERN LAKE IN 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 4075 8891 4142 8825 4120 8824 4121 8801
      4129 8800 4130 8752 4061 8846 4061 8857
      4076 8858

$$

Kluber

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 25, 8:01 PM CDTTornado WarningLOTIroquois31 min
Jun 25, 8:11 PM CDTTornado WarningLOTIroquois22 min
Jun 25, 8:37 PM CDTAreal Flood AdvisoryLOTFord, Iroquois, Kankakee, Livingston5 hr
Jun 25, 9:11 PM CDTSpecial Weather StatementLOTFord64 min
Jun 25, 10:39 PM CDTSpecial Weather StatementLOTFord66 min
Jun 26, 11:27 AM CDTTornado WarningLOTLivingston18 min
Jun 26, 11:34 AM CDTTornado WarningLOTWill26 min
Jun 26, 11:44 AM CDTTornado WarningLOTGrundy, LaSalle, Livingston36 min
Jun 26, 11:49 AM CDTTornado WarningLOTCook26 min
Jun 26, 11:55 AM CDTSpecial Marine WarningLOT2 hr
Jun 26, 12:18 PM CDTFlash Flood WarningLOTCook, DuPage, Will6 hr
Jun 26, 12:33 PM CDTSpecial Marine WarningLOT117 min
Jun 26, 12:34 PM CDTSevere Thunderstorm WarningLOTCook, Will41 min
Jun 26, 12:59 PM CDTSevere Thunderstorm WarningLOTCook11 min
Jun 26, 1:26 PM CDTSevere Thunderstorm WarningLOTCook, Will34 min
Jun 26, 2:08 PM CDTTornado Warning Tornado observedLOTCook, Will25 min
Jun 26, 2:24 PM CDTSpecial Marine WarningLOT2 hr
Jun 26, 2:43 PM CDTAreal Flood AdvisoryLOTCook, Ford, Grundy, Iroquois, Kankakee, LaSalle and 2 more6 hr
Jun 26, 3:31 PM CDTSpecial Marine WarningLOT119 min
Jun 26, 3:34 PM CDTTornado WarningLOTLivingston41 min
Jun 26, 3:50 PM CDTFlash Flood WarningLOTCook, Grundy, Kankakee, Will6 hr
Jun 26, 3:56 PM CDTTornado WarningLOTKankakee, Will34 min
Jun 26, 3:57 PM CDTTornado WarningLOTGrundy, Kankakee, Livingston33 min
Jun 26, 4:13 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Livingston47 min
Jun 26, 4:23 PM CDTTornado WarningLOTFord, Livingston36 min
Jun 26, 4:26 PM CDTRiver Flood WarningLOTCook28 hr
Jun 26, 4:26 PM CDTTornado WarningLOTCook, Will34 min
Jun 26, 4:30 PM CDTSpecial Marine WarningLOT2 hr
Jun 26, 4:41 PM CDTTornado WarningLOTKankakee34 min
Jun 26, 4:49 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Kankakee, Will56 min
Jun 26, 5:21 PM CDTSevere Thunderstorm WarningLOTWill54 min
Jun 26, 5:44 PM CDTSevere Thunderstorm WarningLOTIroquois76 min
Jun 26, 5:54 PM CDTAreal Flood AdvisoryLOTFord, Iroquois, Livingston3 hr
Jun 26, 6:23 PM CDTAreal Flood AdvisoryLOTCook, DuPage, Will7 hr
Jun 26, 6:55 PM CDTRiver Flood WarningLOTLivingston3 days
Jun 26, 1:56 PM CDTSpecial Weather StatementLOTPorter34 min
Jun 26, 2:27 PM CDTSevere Thunderstorm WarningLOTJasper, Lake, Newton, Porter48 min
Jun 26, 5:19 PM CDTTornado WarningLOTLake, Porter13 min
Jun 26, 6:14 PM CDTSevere Thunderstorm WarningLOTBenton, Jasper, Newton76 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.