Alert archive / Illinois / Flash Flood Warnings in 2008

Flash Flood Warning 28, NWS Chicago, IL

September 13, 200811 counties in Illinois

NWS Chicago, IL issued this flash flood warning at Sep 13, 2008, 10:29 AM CDT for 11 counties in Illinois. It was in force for 6 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: Sep 13, 2008, 10:29 AM CDT (15:29 UTC)
Expired: Sep 13, 2008, 4:30 PM CDT
In force: 6 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, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL

The radar

The Chicago radar (KLOT), 53 km from the middle of the area, began a volume at 15:31 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 12:00Z, 3.5 hours before the alert went out and 166 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: 177 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 466 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 36 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Sep 13, 6:52 AM CDT, 3 hours 37 minutes earlier.

Area forecast discussion, Sep 13, 6:52 AM CDT, 3 hours 37 minutes before

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Hazardous weather outlook, Sep 13, 5:59 AM CDT, 4 hours 30 minutes before

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In the hours before

Local storm report, Sep 13, 10:13 AM CDT, 16 minutes before

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Local storm report, Sep 13, 10:21 AM CDT, 8 minutes before

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Local storm report, Sep 13, 10:24 AM CDT, 5 minutes before

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Local storm report, Sep 13, 10:25 AM CDT, 4 minutes before

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Local storm report, Sep 13, 10:28 AM CDT, 1 minute before

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Local storm report, Sep 13, 10:29 AM CDT, 0 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
Sep 12, 8:26 PM CDT	River Flood Advisory	LOT	Boone	20 hr
Sep 12, 9:17 PM CDT	River Flood Warning	LOT	Cook	5 days
Sep 12, 9:17 PM CDT	River Flood Warning	LOT	Cook	6 days
Sep 12, 9:34 PM CDT	River Flood Advisory	LOT	Bureau, LaSalle	15 hr
Sep 12, 11:30 PM CDT	Areal Flood Advisory	LOT	Grundy, LaSalle, Livingston	6 hr
Sep 13, 12:38 AM CDT	Tornado Warning	LOT	Grundy, Livingston	37 min
Sep 13, 1:28 AM CDT	Flash Flood Warning	LOT	Cook, Grundy, Kankakee, Kendall, LaSalle, Livingston and 1 more	6 hr
Sep 13, 2:12 AM CDT	Flash Flood Warning	LOT	DeKalb, Kane, Kendall, LaSalle, Lee	3 hr
Sep 13, 3:34 AM CDT	Flash Flood Warning	LOT	Cook, DuPage, Kane, Will	4 hr
Sep 13, 3:46 AM CDT	River Flood Warning	LOT	Cook	4 days
Sep 13, 4:29 AM CDT	Severe Thunderstorm Warning	LOT	Boone, DeKalb, Grundy, Kane, Kendall, LaSalle and 4 more	1 min
Sep 13, 4:33 AM CDT	Flash Flood Warning	LOT	Boone, Cook, DeKalb, DuPage, Grundy, Kane and 7 more	6 hr
Sep 13, 5:26 AM CDT	Flash Flood Warning	LOT	Cook, Kane, Lake, McHenry	5 hr
Sep 13, 7:26 AM CDT	Flash Flood Warning	LOT	Cook, Grundy, Kankakee, Kendall, LaSalle, Livingston and 1 more	3 hr
Sep 13, 7:35 AM CDT	Flash Flood Warning	LOT	Cook, DuPage, Kane, Will	3 hr
Sep 13, 8:57 AM CDT	River Flood Warning	LOT	Cook	4 days
Sep 13, 10:11 AM CDT	Areal Flood Warning	LOT	Cook, Will	19 hr
Sep 13, 10:58 AM CDT	River Flood Watch	LOT	Winnebago	5 hr
Sep 13, 10:58 AM CDT	River Flood Watch	LOT	DeKalb	5 hr
Sep 13, 11:21 AM CDT	River Flood Warning	LOT	LaSalle	5 days
Sep 13, 12:16 PM CDT	River Flood Warning	LOT	Grundy	6 days
Sep 13, 12:16 PM CDT	River Flood Warning	LOT	Bureau, LaSalle	16 days
Sep 13, 3:53 PM CDT	River Flood Warning	LOT	Boone	18 hr
Sep 13, 3:53 PM CDT	River Flood Warning	LOT	Winnebago	29 hr
Sep 13, 3:53 PM CDT	River Flood Warning	LOT	DeKalb	65 hr
Sep 13, 4:19 PM CDT	Small Craft Advisory	LOT		51 hr
Sep 13, 4:20 PM CDT	Lakeshore Flood Statement	LOT	Lake	51 hr
Sep 13, 4:30 PM CDT	Areal Flood Warning	LOT	Boone, Cook, DeKalb, DuPage, Grundy, Kane and 7 more	13 hr
Sep 13, 4:48 PM CDT	River Flood Warning	LOT	Kankakee	12 days
Sep 13, 4:48 PM CDT	River Flood Warning	LOT	Grundy, Will	4 days
Sep 13, 4:48 PM CDT	River Flood Warning	LOT	LaSalle	4 days
Sep 13, 3:46 AM CDT	River Flood Warning	LOT	Lake	7 days
Sep 13, 4:14 AM CDT	Flash Flood Warning	LOT	Porter	3 hr
Sep 13, 4:48 PM CDT	River Flood Warning	LOT	Lake, Newton	19 days

Nearby

Flash Flood Warnings in Illinois, 2008 Every flash flood warning in 2008

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.