Alert archive / Illinois / Flash Flood Warnings in 2022
Flash Flood Warning 16, NWS Chicago, IL
NWS Chicago, IL issued this flash flood warning at Aug 8, 2022, 6:01 AM CDT for DeKalb County, Ogle County, Illinois. It was in force for 4 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
- Aug 8, 2022, 6:01 AM CDT (11:01 UTC)
- Expired
- Aug 8, 2022, 10:00 AM CDT
- In force
- 4 hr
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Flood severity
- None
Counties DeKalb County, IL, Ogle County, IL
The radar
The Chicago radar (KLOT), 89 km from the middle of the area, began a volume at 11:00 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, 11.0 hours before the alert went out and 127 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.
- Mixed-layer CAPE
- 1298 J/kg
- Mixed-layer CIN
- -84 J/kg
- Mixed-layer LCL
- 916 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 183 m²/s²
- 0-3 km storm-relative helicity
- 278 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.3
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 Aug 7, 6:43 PM CDT, 11 hours 18 minutes earlier.
Area forecast discussion, Aug 7, 6:43 PM CDT, 11 hours 18 minutes before
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</html>Hazardous weather outlook, Aug 7, 4:42 PM CDT, 13 hours 19 minutes before
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</head>
<body>
<main class="wrap">
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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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If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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</html>The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 3:57 AM CDT | Flash Flood Warning | LOT | Boone, Winnebago | 4 hr |
| Aug 8, 5:14 AM CDT | Areal Flood Advisory | LOT | DeKalb, Ogle | 4 hr |
| Aug 8, 6:54 AM CDT | Special Weather Statement | LOT | Ogle | 36 min |
| Aug 8, 7:06 AM CDT | Flash Flood Warning | LOT | DeKalb, Lee, Ogle | 3 hr |
| Aug 8, 8:05 AM CDT | Special Weather Statement | LOT | Lee | 40 min |
| Aug 8, 8:09 AM CDT | Areal Flood Warning | LOT | Boone, DeKalb, Ogle, Winnebago | 3 hr |
| Aug 8, 8:33 AM CDT | Areal Flood Advisory | LOT | Lee | 4 hr |
| Aug 8, 9:46 AM CDT | Areal Flood Advisory | LOT | DeKalb, LaSalle | 3 hr |
| Aug 8, 9:50 AM CDT | River Flood Warning | LOT | Winnebago | 9 days |
| Aug 8, 10:04 AM CDT | Flood Watch | LOT | Grundy, Kendall, LaSalle, Will | 3 hr |
| Aug 8, 10:25 AM CDT | Areal Flood Warning | LOT | Ogle | 3 hr |
| Aug 8, 10:30 AM CDT | Areal Flood Warning | LOT | DeKalb, Lee, Ogle | 3 hr |
Nearby
Flash Flood Warnings in Illinois, 2022Every flash flood warning in 2022
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.