Alert archive / Illinois / Flash Flood Warnings in 2022

Flash Flood Warning 10, NWS Chicago, IL

July 23, 2022Iroquois County, Illinois; Benton County, Indiana

NWS Chicago, IL issued this flash flood warning at Jul 23, 2022, 9:12 AM CDT for Iroquois County, Illinois; Benton County, Indiana. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 23, 2022, 9:12 AM CDT (14:12 UTC)
Expired: Jul 23, 2022, 12:15 PM CDT
In force: 3 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: None

Counties Iroquois County, IL, Benton County, IN

The radar

The Chicago radar (KLOT), 112 km from the middle of the area, began a volume at 14:11 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 2.2 hours before the alert went out and 105 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: 1795 J/kg
Mixed-layer CIN: -121 J/kg
Mixed-layer LCL: 1926 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: -16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Chicago, IL wrote its last area forecast discussion before this flash flood warning went out at Jul 23, 7:17 AM CDT, 1 hour 55 minutes earlier.

Area forecast discussion, Jul 23, 7:17 AM CDT, 1 hour 55 minutes before

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Hazardous weather outlook, Jul 23, 4:16 AM CDT, 4 hours 56 minutes before

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
416 AM CDT Sat Jul 23 2022

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-240930-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
416 AM CDT Sat Jul 23 2022 /516 AM EDT Sat Jul 23 2022/

This Hazardous Weather Outlook is for portions of North Central
Illinois...Northeast Illinois and Northwest Indiana.

.DAY ONE...Today and Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Elevated damaging wind risk...up to 70 mph.
     Limited hail risk...up to quarter size.
     Limited Tornado risk.
  Elevated Flooding Risk.
  Limited Excessive Heat Risk.

DISCUSSION...

Thunderstorms are expected this morning, and the strongest will
pose a threat for damaging wind gusts, as well as hail. Very heavy
rainfall will also accompany these storms, and this may result in
areas of flash flooding, especially along and north of Interstate 80.

Another complex of thunderstorms may move into the region out of
Iowa and Wisconsin this evening. These storms will pose a threat
for strong damaging wind gusts in excess of 70 mph, especially for
locales near and north of Interstate 88. Locally heavy rainfall
amounts will also be possible, which could lead to additional
instances of flash flooding.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Sunday...
  Limited Severe Thunderstorm Risk.
  Limited Flooding Risk.
  Limited Excessive Heat Risk.
Tuesday through Thursday...
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

  Spotters may be needed this morning and again this evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east around 35 mph this morning and towards
  the east southeast at 35 to 45 mph this evening.

LMZ740>745-240930-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
416 AM CDT Sat Jul 23 2022

This Hazardous Weather Outlook is for portions of the Illinois
nearshore waters of Lake Michigan and the Indiana nearshore
waters of Lake Michigan.

.DAY ONE...Today and Tonight.

Weather hazards expected...

  Hazardous conditions for small craft.
  Elevated Thunderstorm Risk...with an associated:
     Limited Waterspout Risk.
     Limited hail risk...up to quarter size.
     Elevated thunderstorm wind gust risk...up to 50 knots.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Sunday...
  Limited Severe Thunderstorm Risk.
Tuesday through Thursday...
  Limited Thunderstorm Risk.

KJB

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In the hours before

Special weather statement, Jul 23, 7:47 AM CDT, 1 hour 25 minutes before

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Local storm report, Jul 23, 8:04 AM CDT, 1 hour 8 minutes before

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Special weather statement, Jul 23, 8:12 AM CDT, 1 hour before

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Special weather statement, Jul 23, 8:35 AM CDT, 37 minutes before

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Special weather statement, Jul 23, 8:56 AM CDT, 16 minutes before

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Special weather statement, Jul 23, 9:01 AM CDT, 11 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 11:11 PM CDT	Special Weather Statement	LOT	Cook	19 min
Jul 22, 11:24 PM CDT	Special Marine Warning	LOT		66 min
Jul 22, 11:41 PM CDT	Special Weather Statement	LOT	Boone	34 min
Jul 22, 11:56 PM CDT	Severe Thunderstorm Warning	LOT	McHenry	49 min
Jul 23, 12:29 AM CDT	Special Marine Warning	LOT		91 min
Jul 23, 12:33 AM CDT	Severe Thunderstorm Warning	LOT	Lake	57 min
Jul 23, 1:23 AM CDT	Severe Thunderstorm Warning	LOT	Lake	52 min
Jul 23, 1:58 AM CDT	Areal Flood Advisory	LOT	Lake, McHenry	5 hr
Jul 23, 2:00 AM CDT	Special Marine Warning	LOT		90 min
Jul 23, 2:30 AM CDT	Flash Flood Warning	LOT	Lake, McHenry	6 hr
Jul 23, 2:52 AM CDT	Flood Watch	LOT	Boone, Cook, DeKalb, DuPage, Grundy, Kane and 8 more	9 hr
Jul 23, 3:21 AM CDT	Special Marine Warning	LOT		114 min
Jul 23, 4:09 AM CDT	Severe Thunderstorm Warning	LOT	Lee, Ogle	66 min
Jul 23, 4:22 AM CDT	Special Marine Warning	LOT		113 min
Jul 23, 4:49 AM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Lee, Ogle	71 min
Jul 23, 4:54 AM CDT	Special Marine Warning	LOT		81 min
Jul 23, 4:56 AM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Kane	64 min
Jul 23, 5:14 AM CDT	Special Weather Statement	LOT	DuPage, Kane, Kendall	31 min
Jul 23, 5:15 AM CDT	Areal Flood Advisory	LOT	Cook, DuPage, Kane	3 hr
Jul 23, 5:29 AM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Will	76 min
Jul 23, 5:32 AM CDT	Severe Thunderstorm Warning	LOT	Kane, Kendall	27 min
Jul 23, 5:35 AM CDT	Flash Flood Warning Considerable damage threat	LOT	Lake	5 hr
Jul 23, 5:47 AM CDT	Tornado Warning	LOT	Cook, Will	28 min
Jul 23, 6:05 AM CDT	Tornado Warning Tornado observed	LOT	Will	25 min
Jul 23, 6:19 AM CDT	Special Marine Warning	LOT		86 min
Jul 23, 6:20 AM CDT	Severe Thunderstorm Warning	LOT	Kankakee	55 min
Jul 23, 6:35 AM CDT	Special Weather Statement	LOT	LaSalle	25 min
Jul 23, 6:42 AM CDT	Severe Thunderstorm Warning	LOT	LaSalle	34 min
Jul 23, 6:51 AM CDT	Special Weather Statement	LOT	Ford, Iroquois	54 min
Jul 23, 7:08 AM CDT	Special Weather Statement	LOT	LaSalle	37 min
Jul 23, 7:20 AM CDT	Special Weather Statement	LOT	Ogle	25 min
Jul 23, 7:44 AM CDT	River Flood Warning	LOT	Cook, Lake	27 hr
Jul 23, 7:44 AM CDT	River Flood Warning	LOT	Cook	34 hr
Jul 23, 7:47 AM CDT	Special Weather Statement	LOT	Lee	43 min
Jul 23, 8:12 AM CDT	Special Weather Statement	LOT	Kankakee	33 min
Jul 23, 8:23 AM CDT	Areal Flood Advisory	LOT	Iroquois	3 hr
Jul 23, 8:56 AM CDT	Special Weather Statement	LOT	DeKalb	49 min
Jul 23, 9:01 AM CDT	Special Weather Statement	LOT	Kankakee	29 min
Jul 23, 9:08 AM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Kane, Kendall	52 min
Jul 23, 9:58 AM CDT	Special Weather Statement	LOT	DuPage	47 min
Jul 23, 10:01 AM CDT	Special Weather Statement	LOT	Kendall	44 min
Jul 23, 10:10 AM CDT	Special Marine Warning	LOT		82 min
Jul 23, 10:15 AM CDT	Areal Flood Advisory	LOT	Cook, DuPage, Kane, Kendall, Will	3 hr
Jul 23, 10:22 AM CDT	Severe Thunderstorm Warning	LOT	DuPage, Will	53 min
Jul 23, 10:49 AM CDT	Special Weather Statement	LOT	Iroquois, Kankakee, Will	41 min
Jul 23, 10:57 AM CDT	Areal Flood Warning	LOT	Lake	3 hr
Jul 23, 11:46 AM CDT	Areal Flood Advisory	LOT	Iroquois, Kankakee	3 hr
Jul 23, 12:23 PM CDT	Flash Flood Warning	LOT	Iroquois	6 hr
Jul 23, 1:14 PM CDT	Severe Thunderstorm Warning	LOT	Livingston	61 min
Jul 23, 1:27 PM CDT	Areal Flood Warning	LOT	Cook, Lake	6 hr
Jul 23, 1:32 PM CDT	Tornado Warning	LOT	Livingston	29 min
Jul 23, 1:45 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	Ford	75 min
Jul 23, 2:27 PM CDT	Areal Flood Advisory	LOT	Ford, Livingston	4 hr
Jul 23, 2:28 PM CDT	Flood Watch	LOT	Boone, Cook, DeKalb, DuPage, Grundy, Kane and 5 more	20 hr
Jul 23, 2:41 PM CDT	Flash Flood Warning	LOT	Ford	3 hr
Jul 23, 2:57 PM CDT	Severe Thunderstorm Warning	LOT	Ford	33 min
Jul 23, 3:19 PM CDT	Severe Thunderstorm Warning	LOT	Livingston	41 min
Jul 23, 3:28 PM CDT	Flash Flood Warning	LOT	Livingston	2 hr
Jul 23, 5:22 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	LaSalle, Livingston	33 min
Jul 23, 4:58 AM CDT	Severe Thunderstorm Warning	LOT	Porter	62 min
Jul 23, 6:46 AM CDT	Severe Thunderstorm Warning	LOT	Benton, Jasper, Newton	59 min
Jul 23, 7:46 AM CDT	Special Weather Statement	LOT	Benton	44 min
Jul 23, 8:35 AM CDT	Special Weather Statement	LOT	Benton	40 min
Jul 23, 11:37 AM CDT	Severe Thunderstorm Warning	LOT	Jasper	23 min

Nearby

Flash Flood Warnings in Illinois, 2022 Flash Flood Warnings in Indiana, 2022 Every flash flood warning in 2022

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.