Alert archive / Illinois / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 684
The Storm Prediction Center issued this severe thunderstorm watch at Aug 22, 2001, 2:00 PM CDT for 5 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 22, 2001, 2:00 PM CDT (19:00 UTC)
- Expired
- Aug 22, 2001, 8:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 53 counties
Clinton County, IA, Jackson County, IA, Scott County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN, Berrien County, MI, Green County, WI, Kenosha County, WI, Lafayette County, WI, Rock County, WI, Walworth County, WI
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 5:08 PM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry | 37 min |
| Aug 22, 5:39 PM CDT | Severe Thunderstorm Warning | ILX | Knox | 66 min |
| Aug 22, 5:51 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kane | 39 min |
| Aug 22, 5:52 PM CDT | Severe Thunderstorm Warning | DVN | Hancock, McDonough | 53 min |
| Aug 22, 6:07 PM CDT | Severe Thunderstorm Warning | ILX | Peoria | 53 min |
| Aug 22, 6:09 PM CDT | Tornado Warning | DVN | McDonough | 51 min |
| Aug 22, 6:17 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 43 min |
| Aug 22, 6:23 PM CDT | Severe Thunderstorm Warning | ILX | Fulton, Schuyler | 67 min |
| Aug 22, 6:35 PM CDT | Severe Thunderstorm Warning | ILX | Tazewell | 55 min |
| Aug 22, 6:46 PM CDT | Severe Thunderstorm Warning | DVN | Hancock | 44 min |
| Aug 22, 6:57 PM CDT | Severe Thunderstorm Warning | ILX | McLean, Woodford | 63 min |
| Aug 22, 7:42 PM CDT | Severe Thunderstorm Warning | DVN | Hancock, McDonough | 63 min |
| Aug 22, 7:46 PM CDT | Severe Thunderstorm Warning | LOT | Livingston | 44 min |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 7.0 hours before the alert went out and 102 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
- 803 J/kg
- Mixed-layer CIN
- -243 J/kg
- Mixed-layer LCL
- 1904 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 214 m²/s²
- 0-3 km storm-relative helicity
- 153 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 |
|---|---|---|---|---|
| Aug 22, 4:00 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Blackford, Boone, Carroll, Cass and 31 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2001Severe Thunderstorm Watches in Indiana, 2001Severe Thunderstorm Watches in Wisconsin, 2001Every severe thunderstorm watch in 2001
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.