Alert archive / Illinois / Flash Flood Warnings in 2015

Flash Flood Warning 26, NWS Chicago, IL

July 8, 2015Ford County, Iroquois County, Livingston County, Illinois; Benton County, Jasper County, Newton County, Indiana

NWS Chicago, IL issued this flash flood warning at Jul 8, 2015, 10:27 PM CDT for Ford County, Iroquois County, Livingston County, Illinois; Benton County, Jasper County, Newton County, Indiana. It was in force for 8 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 8, 2015, 10:27 PM CDT (03:27 UTC)
Expired: Jul 9, 2015, 6:30 AM CDT
In force: 8 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: None

Counties Ford County, IL, Iroquois County, IL, Livingston County, IL, Benton County, IN, Jasper County, IN, Newton County, IN

The radar

The Chicago radar (KLOT), 94 km from the middle of the area, began a volume at 03:27 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, 3.5 hours before the alert went out and 103 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 456 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 225 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 8, 10:02 PM CDT, 25 minutes earlier.

Area forecast discussion, Jul 8, 10:02 PM CDT, 25 minutes before

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Hazardous weather outlook, Jul 8, 2:58 PM CDT, 7 hours 29 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 8, 8:33 PM CDT	River Flood Warning	LOT	Iroquois	11 days
Jul 8, 10:44 PM CDT	River Flood Warning	LOT	Iroquois	71 hr
Jul 9, 12:32 AM CDT	Areal Flood Warning	LOT	Kankakee	6 hr
Jul 9, 6:04 AM CDT	Beach Hazards Statement	LOT		7 hr
Jul 9, 6:27 AM CDT	Flash Flood Warning	LOT	Ford, Iroquois, Livingston	12 hr
Jul 9, 6:29 AM CDT	Areal Flood Warning	LOT	Kankakee	3 hr
Jul 9, 9:33 AM CDT	River Flood Warning	LOT	Livingston	47 hr
Jul 9, 9:33 AM CDT	River Flood Warning	LOT	LaSalle	49 hr
Jul 9, 9:53 AM CDT	River Flood Advisory	LOT	Kankakee	3 days
Jul 9, 9:53 AM CDT	River Flood Advisory	LOT	Grundy, Will	4 days
Jul 9, 5:58 PM CDT	Areal Flood Warning	LOT	Ford, Iroquois, Livingston	18 hr
Jul 8, 8:33 PM CDT	River Flood Warning	LOT	Jasper	4 days
Jul 8, 8:33 PM CDT	River Flood Warning	LOT	Newton	9 days
Jul 9, 9:33 AM CDT	River Flood Warning	LOT	Porter	9 days
Jul 9, 9:33 AM CDT	River Flood Warning	LOT	Jasper, Porter	9 days

Nearby

Flash Flood Warnings in Illinois, 2015 Flash Flood Warnings in Indiana, 2015 Every flash flood warning in 2015

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.