Alert archive / Illinois / Flash Flood Warnings in 1996

Flash Flood Warning 9, NWS Chicago, IL

July 18, 19965 counties in Illinois

NWS Chicago, IL issued this flash flood warning at Jul 18, 1996, 1:42 AM CDT for 5 counties in Illinois. It was in force for 2 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 18, 1996, 1:42 AM CDT (06:42 UTC)
Expired: Jul 18, 1996, 4:00 AM CDT
In force: 2 hr
Issued by: NWS Chicago, IL
Area: Whole counties

Counties Cook County, IL, DuPage County, IL, Kane County, IL, Kendall County, IL, Will County, IL

The radar

The Chicago radar (KLOT), 16 km from the middle of the area, began a volume at 06:46 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, 6.7 hours before the alert went out and 199 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: 3433 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 603 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 327 m²/s²
0-3 km storm-relative helicity: 584 m²/s²
Significant tornado parameter: 6.3
Supercell composite: 35.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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.

In the hours before

Special weather statement, Jul 17, 7:49 PM CDT, 5 hours 53 minutes before

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Special weather statement, Jul 17, 8:03 PM CDT, 5 hours 39 minutes before

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Special weather statement, Jul 17, 8:19 PM CDT, 5 hours 23 minutes before

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Special weather statement, Jul 17, 9:59 PM CDT, 3 hours 43 minutes before

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Special weather statement, Jul 17, 10:11 PM CDT, 3 hours 31 minutes before

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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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Special weather statement, Jul 18, 1:01 AM CDT, 41 minutes before

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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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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, 9:07 PM CDT	Severe Thunderstorm Warning	LOT	Lee	53 min
Jul 17, 11:10 PM CDT	Flash Flood Warning	LOT	Winnebago	3 hr
Jul 18, 4:02 AM CDT	Flash Flood Warning	LOT	Cook, Will	3 hr
Jul 18, 4:02 AM CDT	Flash Flood Warning	LOT	DeKalb, Kane, Kendall	3 hr
Jul 18, 4:02 AM CDT	Flash Flood Warning	LOT	DuPage	3 hr
Jul 18, 9:42 AM CDT	Flash Flood Warning	LOT	DeKalb, Ogle, Winnebago	8 hr
Jul 18, 9:42 AM CDT	Flash Flood Warning	LOT	Cook, DuPage, Kane, Kendall, Will	8 hr
Jul 18, 6:00 PM CDT	Flash Flood Warning	LOT	Cook, DuPage, Kane, Kendall, Will	6 hr
Jul 18, 9:42 AM CDT	Flash Flood Warning	LOT	LaPorte, Marshall, Saint Joseph, Starke	8 hr
Jul 18, 9:42 AM CDT	Flash Flood Warning	LOT	Lake, Porter	8 hr

Nearby

Flash Flood Warnings in Illinois, 1996 Every flash flood warning in 1996

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.