Alert archive / Illinois / Flash Flood Warnings in 2010

Flash Flood Warning 30, NWS Chicago, IL

October 24, 2010Kankakee County, Will County, Illinois

NWS Chicago, IL issued this flash flood warning at Oct 24, 2010, 11:35 PM CDT for Kankakee County, Will County, Illinois. It was in force for 2 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: Oct 24, 2010, 11:35 PM CDT (04:35 UTC)
Expired: Oct 25, 2010, 1:54 AM CDT
In force: 2 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: None

Counties Kankakee County, IL, Will County, IL

The radar

The Chicago radar (KLOT), 37 km from the middle of the area, began a volume at 04:38 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 00:00Z, 4.6 hours before the alert went out and 139 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: 746 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1140 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 142 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.8

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 Oct 24, 11:00 PM CDT, 35 minutes earlier.

Area forecast discussion, Oct 24, 11:00 PM CDT, 35 minutes before

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In the hours before

Local storm report, Oct 24, 10:03 PM CDT, 1 hour 32 minutes before

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Special weather statement, Oct 24, 10:18 PM CDT, 1 hour 17 minutes before

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Local storm report, Oct 24, 10:51 PM CDT, 44 minutes before

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Local storm report, Oct 24, 10:56 PM CDT, 39 minutes before

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Local storm report, Oct 24, 10:58 PM CDT, 37 minutes before

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Local storm report, Oct 24, 11:03 PM CDT, 32 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
Oct 24, 7:56 PM CDT	Special Weather Statement	LOT	Grundy, Kendall	34 min
Oct 24, 8:50 PM CDT	Special Weather Statement	LOT	Cook	25 min
Oct 24, 8:51 PM CDT	Special Marine Warning	LOT		84 min
Oct 24, 9:59 PM CDT	Special Weather Statement	LOT	Will	31 min
Oct 24, 10:18 PM CDT	Special Weather Statement	LOT	Kankakee	57 min
Oct 24, 10:37 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee, Will	38 min
Oct 24, 11:16 PM CDT	Areal Flood Advisory	LOT	Kankakee, Will	3 hr
Oct 25, 4:01 AM CDT	Storm Warning	LOT		66 hr
Oct 25, 4:38 AM CDT	High Wind Warning	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more	39 hr
Oct 25, 3:36 PM CDT	Wind Advisory	LOT	Ford, Grundy, Iroquois, Kankakee, Kendall, LaSalle and 1 more	13 hr

Nearby

Flash Flood Warnings in Illinois, 2010 Every flash flood warning in 2010

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.