Alert archive / Illinois / Tornado Warnings in 2010
Tornado Warning 26, NWS Chicago, IL
NWS Chicago, IL issued this tornado warning at Jul 22, 2010, 10:21 PM CDT for Lake County, McHenry County, Illinois. It was in force for 39 min. 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 22, 2010, 10:21 PM CDT (03:21 UTC)
- Expired
- Jul 22, 2010, 11:00 PM CDT
- In force
- 39 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
Counties Lake County, IL, McHenry County, IL
The radar
The Milwaukee radar (KMKX), 77 km from the middle of the area, began a volume at 03:24 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 22, 8:53 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 3.4 hours before the alert went out and 209 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
- 2664 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 1076 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 125 m²/s²
- 0-3 km storm-relative helicity
- 267 m²/s²
- Significant tornado parameter
- 1.5
- Supercell composite
- 9.9
What forecasters said that day
The local office's own words before this tornado 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 tornado warning went out at Jul 22, 9:59 PM CDT, 22 minutes earlier.
Area forecast discussion, Jul 22, 9:59 PM CDT, 22 minutes before
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</html>Hazardous weather outlook, Jul 22, 8:42 PM CDT, 1 hour 39 minutes before
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Local storm report, Jul 22, 9:50 PM CDT, 31 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 |
|---|---|---|---|---|
| Jul 22, 9:21 PM CDT | Severe Thunderstorm Warning | LOT | Winnebago | 54 min |
| Jul 22, 9:40 PM CDT | Special Marine Warning | LOT | 95 min | |
| Jul 22, 9:48 PM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry, Winnebago | 57 min |
| Jul 22, 10:30 PM CDT | Special Marine Warning | LOT | 2 hr | |
| Jul 22, 10:56 PM CDT | Tornado Warning | LOT | Lake | 34 min |
| Jul 22, 11:10 PM CDT | Areal Flood Advisory | LOT | Boone, Lake, McHenry, Winnebago | 8 hr |
| Jul 22, 11:47 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Ogle, Winnebago | 30 min |
| Jul 23, 12:22 AM CDT | Special Marine Warning | LOT | 89 min | |
| Jul 23, 1:56 AM CDT | Areal Flood Advisory | LOT | DeKalb, Kane, Ogle | 5 hr |
| Jul 23, 4:17 AM CDT | Flash Flood Warning | LOT | Boone, DeKalb, Ogle, Winnebago | 6 hr |
| Jul 23, 4:35 AM CDT | Flash Flood Watch | LOT | Boone, DeKalb, DuPage, Grundy, Kane, Kendall and 6 more | 31 hr |
| Jul 23, 9:30 AM CDT | River Flood Advisory | LOT | Kane, McHenry | 13 hr |
| Jul 23, 9:57 AM CDT | Small Craft Advisory | LOT | 9 hr | |
| Jul 23, 10:00 AM CDT | River Flood Advisory | LOT | Kane, Kendall | 12 hr |
| Jul 23, 10:00 AM CDT | River Flood Advisory | LOT | Winnebago | 12 hr |
| Jul 23, 10:00 AM CDT | River Flood Advisory | LOT | Winnebago | 12 hr |
| Jul 23, 10:00 AM CDT | River Flood Advisory | LOT | Ogle | 12 hr |
| Jul 23, 10:00 AM CDT | River Flood Advisory | LOT | Lake | 12 hr |
| Jul 23, 10:00 AM CDT | River Flood Advisory | LOT | Winnebago | 12 hr |
| Jul 23, 10:06 AM CDT | Areal Flood Advisory | LOT | Boone, DeKalb, Ogle, Winnebago | 6 hr |
| Jul 23, 4:28 PM CDT | Special Weather Statement | LOT | LaSalle | 62 min |
| Jul 23, 4:57 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, LaSalle, Livingston | 48 min |
| Jul 23, 5:28 PM CDT | Special Weather Statement | LOT | DeKalb, Kane, Kendall | 32 min |
| Jul 23, 5:39 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, DuPage, Grundy, Kane, Kendall, LaSalle and 1 more | 55 min |
| Jul 23, 5:45 PM CDT | Special Weather Statement | LOT | Cook, DuPage, Kane | 60 min |
| Jul 23, 5:51 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Grundy, Iroquois, Kankakee, Livingston, Will | 54 min |
| Jul 23, 6:04 PM CDT | Areal Flood Advisory | LOT | Cook, DeKalb, DuPage, Grundy, Kane, Kendall and 2 more | 3 hr |
| Jul 23, 6:06 PM CDT | Special Marine Warning | LOT | 84 min | |
| Jul 23, 6:13 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kankakee, Will | 45 min |
| Jul 23, 6:18 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Kankakee, Livingston | 57 min |
| Jul 23, 6:44 PM CDT | Special Weather Statement | LOT | Cook, Lake | 61 min |
| Jul 23, 6:53 PM CDT | Severe Thunderstorm Warning | LOT | Jasper, Lake, Newton, Porter | 51 min |
Nearby
Tornado Warnings in Illinois, 2010Every tornado warning in 2010Tornadoes 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.