Alert archive / Illinois / Flash Flood Warnings in 2010
Flash Flood Warning 29, NWS Chicago, IL
NWS Chicago, IL issued this flash flood warning at Aug 13, 2010, 5:43 PM CDT for Boone 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
- Aug 13, 2010, 5:43 PM CDT (22:43 UTC)
- Expired
- Aug 13, 2010, 11:45 PM CDT
- In force
- 6 hr
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Flood severity
- None
Counties Boone County, IL, Winnebago County, IL
The radar
The Milwaukee radar (KMKX), 80 km from the middle of the area, began a volume at 22:45 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 12:00Z, 10.7 hours before the alert went out and 148 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
- 2050 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 895 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 110 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 12, 6:48 PM CDT, 22 hours 55 minutes earlier.
Area forecast discussion, Aug 12, 6:48 PM CDT, 22 hours 55 minutes before
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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 13, 4:44 PM CDT | Areal Flood Advisory | LOT | Boone, Winnebago | 60 min |
| Aug 13, 4:49 PM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry, Winnebago | 41 min |
| Aug 13, 5:29 PM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry | 32 min |
| Aug 13, 6:00 PM CDT | Special Weather Statement | LOT | Lee | 30 min |
| Aug 13, 6:16 PM CDT | Special Weather Statement | LOT | DeKalb, Ogle | 29 min |
| Aug 13, 6:44 PM CDT | Special Weather Statement | LOT | DeKalb, Kane, Kendall, LaSalle, McHenry | 31 min |
Nearby
Flash Flood Warnings in Illinois, 2010Every flash flood warning in 2010
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.