Alert archive / Illinois / Flash Flood Warnings in 2006

Flash Flood Warning 8, NWS Chicago, IL

May 31, 2006Iroquois County, Illinois

NWS Chicago, IL issued this flash flood warning at May 31, 2006, 1:30 PM CDT for Iroquois 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: May 31, 2006, 1:30 PM CDT (18:30 UTC)
Expired: May 31, 2006, 4:30 PM CDT
In force: 3 hr
Issued by: NWS Chicago, IL
Area: Counties, with a storm outline in the text

County Iroquois County, IL

The radar

The Chicago radar (KLOT), 98 km from the middle of the area, began a volume at 18:32 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 12:00Z, 6.5 hours before the alert went out and 93 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: 805 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 795 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 18 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 May 31, 6:42 AM CDT, 6 hours 48 minutes earlier.

Area forecast discussion, May 31, 6:42 AM CDT, 6 hours 48 minutes before

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Hazardous weather outlook, May 31, 4:30 AM CDT, 9 hours before

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In the hours before

Local storm report, May 31, 10:33 AM CDT, 2 hours 57 minutes before

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      <div class="status" id="status">Temporary Notice</div>
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      <p id="message1">
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The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 30, 7:13 PM CDT	Severe Thunderstorm Warning	LOT	Cook	44 min
May 30, 7:14 PM CDT	Special Marine Warning	LOT		91 min
May 31, 1:02 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	43 min

Nearby

Flash Flood Warnings in Illinois, 2006 Every flash flood warning in 2006

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.