Alert archive / Illinois / Flash Flood Warnings in 2013

Flash Flood Warning 20, NWS Chicago, IL

June 25, 2013Boone County, McHenry County, Winnebago County, Illinois

NWS Chicago, IL issued this flash flood warning at Jun 25, 2013, 2:32 AM CDT for Boone County, McHenry County, Winnebago County, 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: Jun 25, 2013, 2:32 AM CDT (07:32 UTC)
Expired: Jun 25, 2013, 8:30 AM CDT
In force: 6 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: None

Counties Boone County, IL, McHenry County, IL, Winnebago County, IL

The radar

The Milwaukee radar (KMKX), 74 km from the middle of the area, began a volume at 07:33 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, 7.5 hours before the alert went out and 160 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: 159 J/kg
Mixed-layer CIN: -452 J/kg
Mixed-layer LCL: 1410 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 289 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 Jun 25, 12:45 AM CDT, 1 hour 47 minutes earlier.

Area forecast discussion, Jun 25, 12:45 AM CDT, 1 hour 47 minutes before

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Hazardous weather outlook, Jun 24, 8:55 PM CDT, 5 hours 37 minutes before

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In the hours before

Local storm report, Jun 24, 10:42 PM CDT, 3 hours 50 minutes before

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Local storm report, Jun 24, 11:06 PM CDT, 3 hours 26 minutes before

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Local storm report, Jun 24, 11:08 PM CDT, 3 hours 24 minutes before

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Local storm report, Jun 24, 11:10 PM CDT, 3 hours 22 minutes before

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Special weather statement, Jun 25, 1:40 AM CDT, 52 minutes before

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Special weather statement, Jun 25, 2:24 AM CDT, 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
Jun 25, 1:40 AM CDT	Special Weather Statement	LOT	Boone, Winnebago	35 min
Jun 25, 2:07 AM CDT	Special Marine Warning	LOT		113 min
Jun 25, 2:24 AM CDT	Special Weather Statement	LOT	Boone, Lake, McHenry, Winnebago	66 min
Jun 25, 7:24 AM CDT	Special Weather Statement	LOT	Ogle, Winnebago	36 min
Jun 25, 7:58 AM CDT	Special Weather Statement	LOT	Boone, Winnebago	32 min
Jun 25, 8:31 AM CDT	Areal Flood Advisory	LOT	Boone, Winnebago	3 hr
Jun 25, 9:39 AM CDT	Special Weather Statement	LOT	DeKalb	21 min
Jun 25, 9:58 AM CDT	River Flood Watch	LOT	Ogle	30 hr
Jun 25, 10:01 AM CDT	Special Weather Statement	LOT	Kane	19 min
Jun 25, 10:13 AM CDT	Special Weather Statement	LOT	DuPage	32 min
Jun 25, 10:19 AM CDT	Severe Thunderstorm Warning	LOT	DuPage	26 min
Jun 25, 10:20 AM CDT	Special Marine Warning	LOT		115 min
Jun 25, 10:41 AM CDT	River Flood Watch	LOT	Lake	25 hr
Jun 25, 10:41 AM CDT	River Flood Watch	LOT	Kane, McHenry	22 hr
Jun 25, 4:31 PM CDT	Special Weather Statement	LOT	Ford	14 min
Jun 25, 5:03 PM CDT	Special Weather Statement	LOT	Ford	27 min
Jun 25, 5:31 PM CDT	Special Weather Statement	LOT	Iroquois	29 min
Jun 25, 5:58 PM CDT	Special Weather Statement	LOT	Lake	17 min

Nearby

Flash Flood Warnings in Illinois, 2013 Every flash flood warning in 2013

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.