Alert archive / Illinois / Flash Flood Warnings in 2010

Flash Flood Warning 24, NWS Chicago, IL

July 24, 20109 counties in Illinois

NWS Chicago, IL issued this flash flood warning at Jul 24, 2010, 12:04 AM CDT for 9 counties in Illinois. It was in force for 7 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 24, 2010, 12:04 AM CDT (05:04 UTC)
Expired: Jul 24, 2010, 7:14 AM CDT
In force: 7 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: None

Counties Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Kane County, IL, Lake County, IL, McHenry County, IL, Ogle County, IL, Winnebago County, IL

The radar

The Chicago radar (KLOT), 66 km from the middle of the area, began a volume at 05:05 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, 5.1 hours before the alert went out and 174 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: 2120 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 1074 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 193 m²/s²
0-3 km storm-relative helicity: 216 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.2

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, 4:58 PM CDT, 7 hours 6 minutes earlier.

Area forecast discussion, Jul 23, 4:58 PM CDT, 7 hours 6 minutes before

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Hazardous weather outlook, Jul 23, 3:40 PM CDT, 8 hours 24 minutes before

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In the hours before

Local storm report, Jul 23, 6:43 PM CDT, 5 hours 21 minutes before

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Special weather statement, Jul 23, 6:44 PM CDT, 5 hours 20 minutes before

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Local storm report, Jul 23, 6:46 PM CDT, 5 hours 18 minutes before

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Special weather statement, Jul 23, 6:47 PM CDT, 5 hours 17 minutes before

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Local storm report, Jul 23, 6:52 PM CDT, 5 hours 12 minutes before

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Local storm report, Jul 23, 6:56 PM CDT, 5 hours 8 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 23, 10:05 PM CDT	River Flood Watch	LOT	Winnebago	15 hr
Jul 23, 10:05 PM CDT	River Flood Watch	LOT	Winnebago	15 hr
Jul 23, 10:05 PM CDT	River Flood Watch	LOT	Ogle	15 hr
Jul 23, 10:05 PM CDT	River Flood Watch	LOT	Boone	15 hr
Jul 23, 10:05 PM CDT	River Flood Watch	LOT	Winnebago	15 hr
Jul 23, 10:05 PM CDT	River Flood Watch	LOT	Winnebago	15 hr
Jul 23, 10:11 PM CDT	River Flood Watch	LOT	Kane, McHenry	14 hr
Jul 23, 10:11 PM CDT	River Flood Watch	LOT	Kane, Kendall	14 hr
Jul 23, 10:11 PM CDT	River Flood Watch	LOT	Lake	14 hr
Jul 23, 10:11 PM CDT	River Flood Watch	LOT	Lake	14 hr
Jul 23, 10:11 PM CDT	River Flood Watch	LOT	Will	14 hr
Jul 23, 10:15 PM CDT	River Flood Warning	LOT	Lake	61 hr
Jul 23, 10:35 PM CDT	Special Weather Statement	LOT	Boone, Cook, DeKalb, DuPage, Kane, Lake and 3 more	55 min
Jul 23, 11:31 PM CDT	Areal Flood Advisory	LOT	Boone, Cook, DeKalb, DuPage, Kane, Lake and 4 more	8 hr
Jul 24, 1:31 AM CDT	Flash Flood Warning	LOT	Cook	6 hr
Jul 24, 3:11 AM CDT	Special Weather Statement	LOT	Cook, DuPage	64 min
Jul 24, 4:11 AM CDT	Heat Advisory	LOT	Ford, Iroquois, Kankakee, Livingston	15 hr
Jul 24, 5:03 AM CDT	Special Weather Statement	LOT	DeKalb, Lee, Ogle	42 min
Jul 24, 6:13 AM CDT	Special Weather Statement	LOT	Cook	32 min
Jul 24, 6:38 AM CDT	Special Marine Warning	LOT		84 min
Jul 24, 7:09 AM CDT	Areal Flood Warning	LOT	Boone, Cook, DeKalb, DuPage, Kane, Lake and 4 more	33 hr
Jul 24, 7:44 AM CDT	River Flood Warning	LOT	Lake	14 hr
Jul 24, 7:44 AM CDT	River Flood Warning	LOT	Lake	38 hr
Jul 24, 7:44 AM CDT	River Flood Warning	LOT	Cook	51 hr
Jul 24, 7:44 AM CDT	River Flood Warning	LOT	Will	3 days
Jul 24, 9:25 AM CDT	River Flood Warning	LOT	Cook	12 hr
Jul 24, 9:25 AM CDT	River Flood Warning	LOT	Kane, McHenry	36 hr
Jul 24, 9:25 AM CDT	River Flood Warning	LOT	Kane, Kendall	67 hr
Jul 24, 9:25 AM CDT	River Flood Warning	LOT	LaSalle	43 hr
Jul 24, 9:25 AM CDT	River Flood Warning	LOT	Will	67 hr
Jul 24, 10:16 AM CDT	River Flood Warning	LOT	Winnebago	12 days
Jul 24, 10:16 AM CDT	River Flood Warning	LOT	Winnebago	11 days
Jul 24, 10:16 AM CDT	River Flood Warning	LOT	Ogle	9 days
Jul 24, 10:16 AM CDT	River Flood Warning	LOT	Winnebago	3 days
Jul 24, 10:16 AM CDT	River Flood Warning	LOT	Winnebago	12 days
Jul 24, 11:09 AM CDT	River Flood Advisory	LOT	Grundy	10 hr
Jul 24, 11:09 AM CDT	River Flood Advisory	LOT	LaSalle	59 hr
Jul 24, 11:09 AM CDT	River Flood Advisory	LOT	Bureau, LaSalle	10 hr
Jul 24, 1:03 PM CDT	River Flood Advisory	LOT	Boone	32 hr
Jul 24, 4:40 PM CDT	Special Weather Statement	LOT	Ford, Iroquois	35 min
Jul 24, 5:17 PM CDT	Special Weather Statement	LOT	Ford, Iroquois	58 min
Jul 24, 7:51 AM CDT	Special Weather Statement	LOT	Jasper	39 min
Jul 24, 6:04 PM CDT	Special Weather Statement	LOT	Benton, Jasper, Newton	56 min
Jul 24, 6:44 PM CDT	Areal Flood Advisory	LOT	Benton, Jasper, Newton	3 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.