Alert archive / Illinois / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 165, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Aug 20, 2011, 8:10 AM CDT for Boone County, McHenry County, Winnebago County, Illinois. It was in force for 65 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
- Aug 20, 2011, 8:10 AM CDT (13:10 UTC)
- Expired
- Aug 20, 2011, 9:15 AM CDT
- In force
- 65 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
Counties Boone County, IL, McHenry County, IL, Winnebago County, IL
The radar
The Milwaukee radar (KMKX), 74 km from the middle of the area, began a volume at 13:13 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.
What forecasters said that day
The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Aug 19, 5:24 PM CDT, 14 hours 46 minutes earlier.
Area forecast discussion, Aug 19, 5:24 PM CDT, 14 hours 46 minutes before
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</html>Hazardous weather outlook, Aug 19, 4:33 PM CDT, 15 hours 37 minutes before
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The site you requested is temporarily down for maintenance or an unexpected outage.
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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 20, 8:38 AM CDT | Special Marine Warning | LOT | 3 hr | |
| Aug 20, 8:53 AM CDT | Severe Thunderstorm Warning | LOT | Boone, Lake, McHenry | 37 min |
| Aug 20, 9:08 AM CDT | Special Weather Statement | LOT | LaSalle | 37 min |
| Aug 20, 9:25 AM CDT | Severe Thunderstorm Warning | LOT | Cook, Lake, McHenry | 65 min |
| Aug 20, 10:11 AM CDT | Special Marine Warning | LOT | 2 hr | |
| Aug 20, 1:01 PM CDT | Special Weather Statement | LOT | Kankakee, Will | 59 min |
| Aug 20, 2:10 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 50 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2011Every severe thunderstorm warning in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.