Alert archive / Illinois / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 566
The Storm Prediction Center issued this severe thunderstorm watch at Aug 1, 2002, 6:10 PM CDT for 5 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 1, 2002, 6:10 PM CDT (23:10 UTC)
- Expired
- Aug 2, 2002, 12:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 59 counties
Clinton County, IA, Des Moines County, IA, Henry County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry 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, Logan County, IL, Marshall County, IL, Mason 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, Schuyler 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, Lake County, IN, Porter County, IN, Allegan County, MI, Berrien County, MI, Van Buren County, MI, Adair County, MO, Clark County, MO, Knox County, MO, Scotland County, MO
The radar
The Quad Cities radar (KDVN), 75 km from the middle of the area, began a volume at 23:14 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
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 6:55 PM CDT | Severe Thunderstorm Warning | EAX | Adair, Sullivan | 65 min |
| Aug 1, 10:16 PM CDT | Severe Thunderstorm Warning | GRR | Allegan | 59 min |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 11.2 hours before the alert went out and 72 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
- 2544 J/kg
- Mixed-layer CIN
- -170 J/kg
- Mixed-layer LCL
- 1212 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 4:45 AM CDT | Severe Thunderstorm Watch | SPC | Alger, Baraga, Delta, Dickinson, Houghton, Iron and 4 more | 4 hr |
| Aug 1, 10:20 AM CDT | Severe Thunderstorm Watch | SPC | Alcona, Alpena, Antrim, Arenac, Bay, Benzie and 35 more | 5 hr |
| Aug 1, 2:25 PM CDT | Severe Thunderstorm Watch | SPC | Alger, Alpena, Antrim, Baraga, Benzie, Charlevoix and 24 more | 6 hr |
| Aug 1, 5:30 PM CDT | Tornado Watch | SPC | Alcona, Alpena, Antrim, Arenac, Bay, Cheboygan and 34 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2002Severe Thunderstorm Watches in Iowa, 2002Severe Thunderstorm Watches in Missouri, 2002Every severe thunderstorm watch in 2002
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.