Alert archive / Illinois / Severe Thunderstorm Watches in 2000
Severe Thunderstorm Watch 729
The Storm Prediction Center issued this severe thunderstorm watch at Sep 11, 2000, 1:30 PM CDT for 15 counties in Illinois; Lake County, Porter County, Indiana; 4 counties in Wisconsin. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 11, 2000, 1:30 PM CDT (18:30 UTC)
- Expired
- Sep 11, 2000, 7:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 21 counties
Boone County, IL, Bureau County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Will County, IL, Winnebago County, IL, Lake County, IN, Porter County, IN, Green County, WI, Kenosha County, WI, Rock County, WI, Walworth County, WI
The radar
The Chicago radar (KLOT), 67 km from the middle of the area, began a volume at 18:31 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.
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 2:18 PM CDT | Severe Thunderstorm Warning | LOT | Ogle | 27 min |
| Sep 11, 2:32 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 58 min |
| Sep 11, 2:55 PM CDT | Severe Thunderstorm Warning | LOT | Lee, Ogle | 50 min |
| Sep 11, 3:58 PM CDT | Severe Thunderstorm Warning | LOT | Porter | 32 min |
| Sep 11, 4:01 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 29 min |
| Sep 11, 6:11 PM CDT | Severe Thunderstorm Warning | MKX | Green | 64 min |
| Sep 11, 6:45 PM CDT | Severe Thunderstorm Warning | MKX | Jefferson, Rock | 75 min |
| Sep 11, 6:53 PM CDT | Flash Flood Warning | MKX | Green | 3 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 6.5 hours before the alert went out and 173 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
- 1636 J/kg
- Mixed-layer CIN
- -239 J/kg
- Mixed-layer LCL
- 1387 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 1:15 PM CDT | Tornado Watch | SPC | Carroll, Henry, Jo Daviess, Mercer, Rock Island, Stark and 2 more | 6 hr |
| Sep 10, 8:15 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Crawford, Green Lake, Jackson, Juneau, La Crosse and 10 more | 6 hr |
| Sep 11, 3:30 PM CDT | Tornado Watch | SPC | Barron, Buffalo, Chippewa, Clark, Dunn, Eau Claire and 6 more | 5 hr |
| Sep 11, 5:15 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Calumet, Columbia, Crawford, Dodge and 26 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2000Severe Thunderstorm Watches in Wisconsin, 2000Severe Thunderstorm Watches in Indiana, 2000Every severe thunderstorm watch in 2000
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.