Alert archive / Illinois / River Flood Warnings in 2016

River Flood Warning 15, NWS Chicago, IL

July 18, 2016Grundy County, Illinois

NWS Chicago, IL issued this river flood warning at Jul 18, 2016, 8:28 AM CDT for Grundy County, Illinois. It took effect at Jul 18, 2016, 1:27 PM CDT. It was in force for 38 hr.

The area

The counties it named.

The facts

Issued: Jul 18, 2016, 8:28 AM CDT (13:28 UTC)
In effect from: Jul 18, 2016, 1:27 PM CDT
Expired: Jul 20, 2016, 3:40 AM CDT
In force: 38 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: Minor

County Grundy County, IL

The radar

The Chicago radar (KLOT), 45 km from the middle of the area, began a volume at 13:31 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 river

Written for the forecast point Mazon River near Coal City (COLI2). The gauge peaked at 13.78 ft at Jul 19, 2016, 8:00 AM CDT.

Action stage: 10 ft
Minor stage: 12 ft
Moderate stage: 16 ft
Major stage: 19 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 05542000, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

The local office's own words before this river 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 river flood warning went out at Jul 18, 6:28 AM CDT, 2 hours earlier.

Area forecast discussion, Jul 18, 6:28 AM CDT, 2 hours before

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Hazardous weather outlook, Jul 18, 4:33 AM CDT, 3 hours 55 minutes before

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In the hours before

Local storm report, Jul 18, 3:42 AM CDT, 4 hours 46 minutes before

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Local storm report, Jul 18, 5:07 AM CDT, 3 hours 21 minutes before

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Local storm report, Jul 18, 7:11 AM CDT, 1 hour 17 minutes before

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Local storm report, Jul 18, 7:18 AM CDT, 1 hour 10 minutes before

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Local storm report, Jul 18, 7:26 AM CDT, 1 hour 2 minutes before

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Local storm report, Jul 18, 7:58 AM CDT, 30 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 17, 7:51 PM CDT	Severe Thunderstorm Warning	LOT	Livingston	39 min
Jul 17, 8:18 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, LaSalle	27 min
Jul 17, 8:31 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle	44 min
Jul 17, 8:43 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Grundy, Kankakee, Livingston, Will	47 min
Jul 17, 8:47 PM CDT	Tornado Warning	LOT	Grundy, Livingston	28 min
Jul 17, 9:03 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee, Will	27 min
Jul 17, 9:13 PM CDT	Tornado Warning	LOT	Ford, Kankakee, Livingston	32 min
Jul 17, 9:25 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee, Will	35 min
Jul 17, 9:45 PM CDT	Tornado Warning	LOT	Ford, Iroquois, Kankakee	30 min
Jul 17, 10:09 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	51 min
Jul 17, 10:14 PM CDT	Special Marine Warning	LOT		2 hr
Jul 17, 10:36 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, LaSalle	24 min
Jul 17, 11:06 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	39 min
Jul 17, 11:11 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, LaSalle, Livingston	34 min
Jul 17, 11:45 PM CDT	Areal Flood Advisory	LOT	Grundy, LaSalle, Livingston	4 hr
Jul 18, 12:28 AM CDT	Areal Flood Advisory	LOT	Iroquois, Kankakee, Will	4 hr
Jul 18, 12:53 AM CDT	Flash Flood Warning	LOT	Ford, Iroquois, Kankakee, Livingston	5 hr
Jul 18, 2:30 AM CDT	Flash Flood Warning	LOT	Grundy, LaSalle, Livingston	4 hr
Jul 18, 3:26 AM CDT	Areal Flood Advisory	LOT	Ford, Iroquois, Livingston	3 hr
Jul 18, 8:28 AM CDT	River Flood Warning	LOT	Iroquois	34 hr
Jul 18, 10:46 AM CDT	Areal Flood Warning	LOT	Ford, Grundy, Iroquois, Kankakee, LaSalle, Livingston	12 hr
Jul 18, 3:19 PM CDT	Excessive Heat Watch	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more	61 hr
Jul 18, 12:00 AM CDT	Areal Flood Advisory	LOT	Jasper, Newton	4 hr

Nearby

River Flood Warnings in Illinois, 2016 Every river flood warning in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.