Alert archive / Illinois / Flash Flood Warnings in 2025

Flash Flood Warning 7, NWS Chicago, IL

July 10, 2025Ogle County, Illinois

NWS Chicago, IL issued this flash flood warning at Jul 10, 2025, 8:18 PM CDT for Ogle County, Illinois. 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 10, 2025, 8:18 PM CDT (01:18 UTC)
Expired: Jul 10, 2025, 10:52 PM CDT
In force: 3 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: None

County Ogle County, IL

The radar

The Chicago radar (KLOT), 113 km from the middle of the area, began a volume at 01:18 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, 1.3 hours before the alert went out and 108 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: 2407 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1108 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 12.9

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 10, 6:59 PM CDT, 1 hour 19 minutes earlier.

Area forecast discussion, Jul 10, 6:59 PM CDT, 1 hour 19 minutes before

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Hazardous weather outlook, Jul 10, 3:35 PM CDT, 4 hours 43 minutes before

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In the hours before

Local storm report, Jul 10, 6:40 PM CDT, 1 hour 38 minutes before

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Local storm report, Jul 10, 6:48 PM CDT, 1 hour 30 minutes before

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Local storm report, Jul 10, 6:56 PM CDT, 1 hour 22 minutes before

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Special weather statement, Jul 10, 7:06 PM CDT, 1 hour 12 minutes before

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Local storm report, Jul 10, 7:10 PM CDT, 1 hour 8 minutes before

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Local storm report, Jul 10, 8:16 PM CDT, 2 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 10, 7:06 PM CDT	Special Weather Statement	LOT	Will	24 min
Jul 10, 7:14 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee, Will	61 min
Jul 10, 7:58 PM CDT	Flash Flood Warning	LOT	Boone, Winnebago	3 hr
Jul 10, 8:11 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee	64 min
Jul 10, 8:59 PM CDT	Special Weather Statement	LOT	Kane	31 min
Jul 10, 9:17 PM CDT	Special Weather Statement	LOT	Kankakee	28 min
Jul 10, 10:52 PM CDT	Areal Flood Warning	LOT	Boone, Winnebago	6 hr
Jul 10, 10:52 PM CDT	Areal Flood Warning	LOT	Ogle	6 hr
Jul 10, 11:10 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle	80 min
Jul 10, 11:59 PM CDT	Special Weather Statement	LOT	Cook	31 min
Jul 11, 3:37 AM CDT	Flood Watch	LOT	Boone, Lee, Ogle, Winnebago	18 hr
Jul 11, 5:59 PM CDT	Severe Thunderstorm Warning	LOT	Ogle, Winnebago	76 min
Jul 11, 6:50 PM CDT	Special Weather Statement	LOT	McHenry	25 min
Jul 11, 6:56 PM CDT	Severe Thunderstorm Warning	LOT	Lee	45 min

Nearby

Flash Flood Warnings in Illinois, 2025 Every flash flood warning in 2025

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.