Alert archive / Illinois / Flash Flood Warnings in 2019

Flash Flood Warning 21, NWS Chicago, IL

September 27, 20194 counties in Illinois; Lake County, Porter County, Indiana

NWS Chicago, IL issued this flash flood warning at Sep 27, 2019, 7:48 PM CDT for 4 counties in Illinois; Lake County, Porter County, Indiana. It was in force for 6 hr. 21 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: Sep 27, 2019, 7:48 PM CDT (00:48 UTC)
Expired: Sep 28, 2019, 1:45 AM CDT
In force: 6 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: None

Counties Cook County, IL, DuPage County, IL, Kankakee County, IL, Will County, IL, Lake County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 53 km from the middle of the area, began a volume at 00:50 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
Sep 27, 8:00 PM CDT	FLOOD	3 Nne Highland, IN	PUBLIC REPORTS STREET FLOODING UP TO 6 INCHES DEEP NEAR CLINE AND 169TH AT THE HAMMOND AND GARY BORDER.
Sep 27, 8:00 PM CDT	FLASH FLOOD	4 Nnw Manteno, IL	WATER RESCUE NEAR KENNEDY ROAD AND US52. TIME APPROXIMATE.
Sep 27, 8:10 PM CDT	FLASH FLOOD	1 Ssw Crown Point, IN	STREET FLOODING MULTIPLE FEET DEEP NEAR LAKE STREET AND GREENWOOD AVENUE IN CROWN POINT.
Sep 27, 8:30 PM CDT	FLOOD	Peotone, IL	FLOODING OF NUMEROUS STREETS ACROSS PEOTONE.
Sep 27, 8:52 PM CDT	HEAVY RAIN 5.66	1 W Peotone, IL	STORM TOTAL RAINFALL SO FAR. REPORTED FROM WEST CORNING AVENUE.
Sep 27, 8:55 PM CDT	FLASH FLOOD	1 W Peotone, IL	SIX INCHES OR MORE OF FLOWING WATER ON PORTIONS OF WEST CORNING AVENUE. ROAD CLOSED.
Sep 27, 9:00 PM CDT	FLOOD	2 Nw Rockdale, IL	PUBLIC REPORTS STREET FLOODING NEAR ONEIDA STREET AND HAMMES AVENUE IN JOLIET. RELAYED VIA SOCIAL MEDIA.
Sep 27, 9:00 PM CDT	FLOOD	2 W Crest Hill, IL	PUBLIC REPORTS STREET FLOODING NEAR THEODORE STREET AND LARKIN AVENUE IN JOLIET. RELAYED VIA SOCIAL MEDIA.
Sep 27, 9:00 PM CDT	FLASH FLOOD	2 Wnw Lockport, IL	RT 53 FLOODED AND CLOSED BETWEEN RENWICK AND TAYLOR. ALSO, WEBER FLOODED AND CLOSED BETWEEN RENSICK AND AIRPORT RD.
Sep 27, 9:04 PM CDT	HEAVY RAIN 5.82	1 W Peotone, IL	CORRECTS PREVIOUS HEAVY RAIN REPORT FROM 1 W PEOTONE. STORM TOTAL RAINFALL SO FAR. REPORTED FROM WEST CORNING AVENUE.
Sep 27, 9:15 PM CDT	FLASH FLOOD	1 Nne Olympia Fields, IL	VOLMER RD FLOODED AND CLOSED BETWEEN KEDZIE AND WESTERN.
Sep 27, 9:15 PM CDT	FLASH FLOOD	2 Nnw Lockport, IL	IL-53 CLOSED NEAR LEWIS UNIVERSITY DUE TO FLOODING.
Sep 27, 9:15 PM CDT	HEAVY RAIN 6.73	1 Sw Country Club Hills, IL	STORM TOTAL TODAY.
Sep 27, 9:45 PM CDT	FLASH FLOOD	3 Ne Crystal Lawns, IL	NWS EMPLOYEE REPORTS WEBER ROAD CLOSED NEAR RENWICK DUE TO FLOODING.
Sep 27, 11:55 PM CDT	HEAVY RAIN 5.02	2 Se St. John, IN	6 HOUR ACCUMULATION
Sep 28, 12:10 AM CDT	HEAVY RAIN 0	2 Se St. John, IN	5.02 INCHES IN 6 HRS.
Sep 28, 1:05 AM CDT	HEAVY RAIN 2.54	Nws Chicago-Romeoville, IL	6 HOUR AMOUNT 7:00PM - 1:00AM.
Sep 28, 1:05 AM CDT	HEAVY RAIN 2.54	Nws Chicago-Romeoville, IL	6 HOUR AMOUNT 7:00PM - 1:00AM CORRECTS PREVIOUS HEAVY RAIN REPORT FROM NWS CHICAGO-ROMEOVILLE.
Sep 28, 1:05 AM CDT	HEAVY RAIN 2.54	Nws Chicago-Romeoville, IL
Sep 28, 1:06 AM CDT	HEAVY RAIN 2.22	3 Sw Midway Airport, IL	CORRECTS PREVIOUS HEAVY RAIN REPORT FROM 3 SW MIDWAY AIRPORT. 6 HOUR AMOUNT.
Sep 28, 1:06 AM CDT	HEAVY RAIN 2.22	3 Sw Midway Airport, IL	STORM TOTAL.

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 00:00Z, 0.8 hours before the alert went out and 187 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1621 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 1595 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 198 m²/s²
0-3 km storm-relative helicity: 340 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 10.8

Open this sounding in Storm Lab

The text

As transmitted.

814 
WGUS53 KLOT 280048
FFWLOT
ILC031-043-091-197-INC089-127-280645-
/O.NEW.KLOT.FF.W.0021.190928T0048Z-190928T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Chicago/Romeoville
748 PM CDT Fri Sep 27 2019

The National Weather Service in Chicago has issued a

* Flash Flood Warning for...
  Will County in northeastern Illinois...
  Northern Kankakee County in northeastern Illinois...
  Southeastern DuPage County in northeastern Illinois...
  Southeastern Cook County in northeastern Illinois...
  Porter County in northwestern Indiana...
  Lake County in northwestern Indiana...


* Until 145 AM CDT Saturday.

* At 743 PM CDT, Doppler radar was tracking multiple waves of heavy 
  thunderstorms moving across the area. Rainfall rates of 1-2 inches 
  per hour are likely, with isolated heavier rates possible. Flash 
  flooding may begin shortly.

* Some locations that will experience flooding include...
  Chicago, Joliet, Hammond, Gary, Bolingbrook, Orland Park, Tinley
  Park, Oak Lawn, Romeoville, Plainfield, Calumet City, Portage,
  Merrillville, Valparaiso, Chicago Heights, East Chicago,
  Schererville, Hobart, Lansing and Crown Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means that life threatening flooding is 
imminent. Residents living along streams and creeks or near 
otherwise flood prone areas should should take immediate precautions 
to protect life and property.

In urban areas, highway and underpasses are especially vulnerable to 
flooding. Turn around, don't drown when encountering flooded roads. 
Most flood deaths occur in vehicles.

&&

LAT...LON 4126 8763 4120 8824 4166 8826 4181 8759
      4175 8753 4170 8751 4167 8747 4168 8743
      4164 8743 4163 8735 4162 8728 4163 8716
      4165 8715 4165 8710 4171 8693 4143 8693

$$

WSL

3 follow-up statements

506 
WGUS73 KLOT 280131
FFSLOT

Flash Flood Statement
National Weather Service Chicago/Romeoville
831 PM CDT Fri Sep 27 2019

ILC031-043-091-197-INC089-127-280645-
/O.CON.KLOT.FF.W.0021.000000T0000Z-190928T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Will IL-Kankakee IL-DuPage IL-Cook IL-Porter IN-Lake IN-
831 PM CDT Fri Sep 27 2019

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 AM CDT FOR
WILL...NORTHERN KANKAKEE...SOUTHEASTERN DUPAGE...SOUTHEASTERN COOK...
PORTER AND LAKE COUNTIES...

At 827 PM CDT, Doppler radar was continuing to indicate multiple 
waves of heavy rainfall moving across the area. Rainfall of 2-4 
inches has occurred so far, with rainfall rates of 1-3 inches per 
hour ongoing. 

Some locations that will experience flooding include...
Chicago, Joliet, Hammond, Gary, Bolingbrook, Orland Park, Tinley
Park, Oak Lawn, Romeoville, Plainfield, Calumet City, Portage,
Merrillville, Valparaiso, Chicago Heights, East Chicago,
Schererville, Hobart, Lansing and Crown Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This warning includes numerous underpasses and other flood prone 
areas. Turn around, don't drown when encountering flooded roads. 
Most flood deaths occur in vehicles.

Residents living along streams and creeks or other flood prone areas 
should take immediate precautions to protect life and property.

&&

LAT...LON 4126 8763 4120 8824 4166 8826 4181 8759
      4175 8753 4170 8751 4167 8747 4168 8743
      4164 8743 4163 8735 4162 8728 4163 8716
      4165 8715 4165 8710 4171 8693 4143 8693

$$

WSL

712 
WGUS73 KLOT 280251
FFSLOT

Flash Flood Statement
National Weather Service Chicago/Romeoville
951 PM CDT Fri Sep 27 2019

ILC031-043-091-197-INC089-127-280645-
/O.CON.KLOT.FF.W.0021.000000T0000Z-190928T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Will IL-Kankakee IL-DuPage IL-Cook IL-Porter IN-Lake IN-
951 PM CDT Fri Sep 27 2019

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 AM CDT FOR
WILL...NORTHERN KANKAKEE...SOUTHEASTERN DUPAGE...SOUTHEASTERN COOK...
PORTER AND LAKE COUNTIES...

At 949 PM CDT, Doppler radar indicated heavy rainfall continuing 
across portions of the warned area. Rainfall of up to 5-6 inches has 
already occurred with numerous reports of flooding received. 
Flooding impacts are expected to continue for the next several hours.

Some locations that will experience flooding include...
Chicago, Joliet, Hammond, Gary, Bolingbrook, Orland Park, Tinley
Park, Oak Lawn, Romeoville, Plainfield, Calumet City, Portage,
Merrillville, Valparaiso, Chicago Heights, East Chicago,
Schererville, Hobart, Lansing and Crown Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means that flooding is imminent or occurring. 
Most flood deaths occur in vehicles. Turn around, don't drown when 
encountering flooded roads.


&&

LAT...LON 4126 8763 4120 8824 4166 8826 4181 8759
      4175 8753 4170 8751 4167 8747 4168 8743
      4164 8743 4163 8735 4162 8728 4163 8716
      4165 8715 4165 8710 4171 8693 4143 8693

$$

WSL

347 
WGUS73 KLOT 280643
FFSLOT

Flash Flood Statement
National Weather Service Chicago/Romeoville
143 AM CDT Sat Sep 28 2019

ILC031-043-091-197-INC089-127-280652-
/O.EXP.KLOT.FF.W.0021.000000T0000Z-190928T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Will IL-Kankakee IL-DuPage IL-Cook IL-Porter IN-Lake IN-
143 AM CDT Sat Sep 28 2019

...THE FLASH FLOOD WARNING FOR WILL...NORTHERN KANKAKEE...
SOUTHEASTERN DUPAGE...SOUTHEASTERN COOK...PORTER AND LAKE COUNTIES
WILL EXPIRE AT 145 AM CDT...

The heaviest rainfall has come to an end, but light to occasionally 
moderate showers and embedded thunderstorms will persist tonight. 
The Flash Flood Warning has expired, but has been replaced by an 
Areal Flood Warning as numerous roads remain closed and impassable. 
Please continue to heed any remaining road closures tonight. 

LAT...LON 4126 8763 4120 8824 4166 8826 4181 8759
      4175 8753 4170 8751 4167 8747 4168 8743
      4164 8743 4163 8735 4162 8728 4163 8716
      4165 8715 4165 8710 4171 8693 4143 8693

$$

Carlaw

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 27, 7:05 PM CDT	Areal Flood Advisory	LOT	DeKalb, Grundy, Kendall, LaSalle, Livingston	6 hr
Sep 27, 7:21 PM CDT	Areal Flood Advisory	LOT	Cook, DuPage, Will	5 hr
Sep 27, 7:37 PM CDT	Flash Flood Warning	LOT	Grundy, Kendall, LaSalle	6 hr
Sep 27, 8:00 PM CDT	River Flood Watch	LOT	Winnebago	52 min
Sep 27, 8:00 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, Kendall, LaSalle	30 min
Sep 27, 9:02 PM CDT	Flash Flood Warning	LOT	Grundy, LaSalle, Livingston	6 hr
Sep 27, 9:04 PM CDT	River Flood Warning	LOT	Will	59 hr
Sep 27, 9:04 PM CDT	River Flood Warning	LOT	LaSalle	3 days
Sep 27, 9:13 PM CDT	River Flood Advisory	LOT	Will	61 hr
Sep 27, 9:13 PM CDT	River Flood Advisory	LOT	Will	13 hr
Sep 27, 9:28 PM CDT	River Flood Warning	LOT	Grundy	66 hr
Sep 27, 9:28 PM CDT	River Flood Warning	LOT	LaSalle	4 days
Sep 27, 9:28 PM CDT	River Flood Warning	LOT	Bureau, LaSalle, Putnam	12 days
Sep 27, 9:39 PM CDT	River Flood Advisory	LOT	Kane, McHenry	18 hr
Sep 27, 9:39 PM CDT	River Flood Advisory	LOT	Grundy	33 hr
Sep 27, 9:55 PM CDT	River Flood Warning	LOT	Cook	58 hr
Sep 27, 10:05 PM CDT	River Flood Advisory	LOT	Cook	48 hr
Sep 27, 11:38 PM CDT	Special Weather Statement	LOT	Livingston	52 min
Sep 27, 11:52 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Livingston	53 min
Sep 28, 12:23 AM CDT	Special Weather Statement	LOT	Iroquois	52 min
Sep 28, 12:42 AM CDT	Areal Flood Advisory	LOT	Ford, Iroquois	2 hr
Sep 28, 1:33 AM CDT	Areal Flood Warning	LOT	Grundy, Kankakee, Kendall, LaSalle, Will	6 hr
Sep 28, 1:42 AM CDT	Areal Flood Warning	LOT	Cook	6 hr
Sep 28, 2:48 AM CDT	Areal Flood Warning	LOT	LaSalle, Livingston	6 hr
Sep 28, 4:10 AM CDT	Beach Hazards Statement	LOT	Lake	39 hr
Sep 28, 4:10 AM CDT	Lakeshore Flood Advisory	LOT	Lake	17 hr
Sep 28, 9:13 AM CDT	River Flood Warning	LOT	LaSalle	10 hr
Sep 28, 9:34 AM CDT	River Flood Advisory	LOT	Grundy, Kankakee, Will	22 hr
Sep 28, 2:41 PM CDT	Flash Flood Watch	LOT	DeKalb, DuPage, Grundy, Kane, Kankakee, Kendall and 3 more	16 hr
Sep 28, 3:10 PM CDT	River Flood Warning	LOT	Kane, McHenry	46 hr
Sep 27, 7:10 PM CDT	Severe Thunderstorm Warning	LOT	Jasper, Lake, Newton, Porter	52 min
Sep 27, 8:03 PM CDT	River Flood Warning	LOT	Lake	64 hr
Sep 27, 10:05 PM CDT	River Flood Advisory	LOT	Lake	17 hr
Sep 28, 1:04 AM CDT	Special Weather Statement	LOT	Benton, Newton	41 min
Sep 28, 3:10 PM CDT	River Flood Warning	LOT	Lake	14 hr

Nearby

Flash Flood Warnings in Illinois, 2019 Flash Flood Warnings in Indiana, 2019 Every flash flood warning in 2019

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.