Alert archive / Illinois / Flash Flood Warnings in 2024

Flash Flood Warning 5, NWS Chicago, IL

June 22, 20244 counties in Illinois

NWS Chicago, IL issued this flash flood warning at Jun 22, 2024, 9:13 PM CDT for 4 counties in Illinois. It was in force for 4 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
Jun 22, 2024, 9:13 PM CDT (02:13 UTC)
Expired
Jun 23, 2024, 1:15 AM CDT
In force
4 hr
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Flood severity
None

Counties Boone County, IL, Lake County, IL, McHenry County, IL, Winnebago County, IL

The radar

The Milwaukee radar (KMKX), 71 km from the middle of the area, began a volume at 02:14 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

Davenport, (KDVN), launched 00:00Z, 2.2 hours before the alert went out and 178 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, Davenport, at 00:00Z on 2024-06-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1535 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2024-06-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 162 square meters per square second.19395878Sfc1 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
1535 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
1281 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
162 m²/s²
0-3 km storm-relative helicity
339 m²/s²
Significant tornado parameter
1.7
Supercell composite
18.7

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 22, 7:37 PM CDTFlood WatchLOTBoone, Cook, DeKalb, DuPage, Grundy, Kane and 8 more5 hr
Jun 22, 8:09 PM CDTSevere Thunderstorm WarningLOTBoone, McHenry, Winnebago51 min
Jun 22, 8:18 PM CDTSpecial Marine WarningLOT117 min
Jun 22, 8:40 PM CDTSevere Thunderstorm Warning Considerable damage threatLOTLake, McHenry50 min
Jun 22, 8:54 PM CDTAreal Flood AdvisoryLOTBoone, McHenry, Winnebago31 min
Jun 22, 9:42 PM CDTSevere Thunderstorm WarningLOTOgle, Winnebago33 min
Jun 22, 9:43 PM CDTSevere Thunderstorm WarningLOTOgle, Winnebago32 min
Jun 22, 9:59 PM CDTSevere Thunderstorm WarningLOTBoone, DeKalb46 min
Jun 22, 10:03 PM CDTAreal Flood AdvisoryLOTOgle3 hr
Jun 22, 10:25 PM CDTSevere Thunderstorm WarningLOTKane35 min
Jun 22, 10:33 PM CDTAreal Flood AdvisoryLOTCook, DeKalb, Kane, Lee, Ogle3 hr
Jun 22, 10:43 PM CDTSevere Thunderstorm Warning Considerable damage threatLOTDuPage47 min
Jun 22, 10:59 PM CDTSpecial Marine WarningLOT106 min
Jun 22, 11:11 PM CDTSevere Thunderstorm Warning Considerable damage threatLOTCook49 min
Jun 22, 11:20 PM CDTFlash Flood WarningLOTCook, DeKalb, DuPage, Kane, Lee, Ogle4 hr
Jun 23, 12:06 AM CDTAreal Flood AdvisoryLOTCook, Will3 hr
Jun 23, 1:18 AM CDTAreal Flood WarningLOTBoone, Lake, McHenry, Winnebago9 hr
Jun 23, 8:55 AM CDTRiver Flood WarningLOTWinnebago21 days
Jun 23, 8:59 AM CDTRiver Flood WarningLOTWinnebago21 days
Jun 23, 9:20 AM CDTRiver Flood WatchLOTWinnebago26 hr

Nearby

Flash Flood Warnings in Illinois, 2024Every flash flood warning in 2024

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.