Alert archive / Illinois / Severe Thunderstorm Warnings in 2008
Severe Thunderstorm Warning 91, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jun 15, 2008, 6:49 AM CDT for 5 counties in Illinois. It was in force for 41 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
- Jun 15, 2008, 6:49 AM CDT (11:49 UTC)
- Expired
- Jun 15, 2008, 7:30 AM CDT
- In force
- 41 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
Counties DeKalb County, IL, Kane County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL
The radar
The Chicago radar (KLOT), 57 km from the middle of the area, began a volume at 11:49 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 |
|---|---|---|---|
| Jun 15, 5:10 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 11.8 hours before the alert went out and 145 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
- 8 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 1554 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 196 m²/s²
- 0-3 km storm-relative helicity
- 376 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jun 15, 5:44 AM CDT, 1 hour 5 minutes earlier.
Area forecast discussion, Jun 15, 5:44 AM CDT, 1 hour 5 minutes before
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</html>Hazardous weather outlook, Jun 15, 4:40 AM CDT, 2 hours 9 minutes before
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Local storm report, Jun 15, 6:40 AM CDT, 9 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 |
|---|---|---|---|---|
| Jun 15, 6:25 AM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Kane, Lee, Ogle | 50 min |
| Jun 15, 6:32 AM CDT | Special Marine Warning | LOT | 118 min | |
| Jun 15, 7:00 AM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Will | 60 min |
| Jun 15, 8:34 AM CDT | Special Marine Warning | LOT | 51 min | |
| Jun 15, 9:21 AM CDT | River Flood Advisory | LOT | Cook | 18 hr |
| Jun 15, 2:23 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle | 67 min |
| Jun 15, 2:51 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, DuPage, Kane, Kendall, LaSalle, Will | 39 min |
| Jun 15, 3:01 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle, Livingston | 59 min |
| Jun 15, 3:17 PM CDT | Flash Flood Warning | LOT | LaSalle | 3 hr |
| Jun 15, 3:23 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Grundy, Kendall, Will | 50 min |
| Jun 15, 3:26 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee, Will | 64 min |
| Jun 15, 3:51 PM CDT | Areal Flood Advisory | LOT | Kankakee, Will | 3 hr |
| Jun 15, 4:15 PM CDT | Areal Flood Advisory | LOT | Kankakee, Will | 3 hr |
| Jun 15, 4:32 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Livingston | 46 min |
| Jun 15, 4:46 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 40 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2008Every severe thunderstorm warning in 2008
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.