Alert archive / Illinois / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 824
The Storm Prediction Center issued this severe thunderstorm watch at Aug 1, 2003, 2:00 PM CDT for 41 counties in Illinois; 7 counties in Iowa; Clark County, Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 1, 2003, 2:00 PM CDT (19:00 UTC)
- Expired
- Aug 1, 2003, 8:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 49 counties
Des Moines County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Louisa County, IA, Scott County, IA, Van Buren County, IA, Adams County, IL, Boone County, IL, Brown County, IL, Bureau County, IL, Cass County, IL, DeKalb County, IL, DuPage County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Ogle County, IL, Peoria County, IL, Pike County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Clark County, MO
The radar
The Quad Cities radar (KDVN), 77 km from the middle of the area, began a volume at 18:59 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
19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 2:11 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Louisa | 64 min |
| Aug 1, 2:47 PM CDT | Severe Thunderstorm Warning | DVN | Mercer | 43 min |
| Aug 1, 3:09 PM CDT | Severe Thunderstorm Warning | LOT | Kane | 36 min |
| Aug 1, 3:27 PM CDT | Severe Thunderstorm Warning | DVN | Mercer, Rock Island | 48 min |
| Aug 1, 3:27 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 63 min |
| Aug 1, 3:37 PM CDT | Severe Thunderstorm Warning | DVN | Putnam | 53 min |
| Aug 1, 3:37 PM CDT | Severe Thunderstorm Warning | ILX | Marshall | 53 min |
| Aug 1, 3:45 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle | 60 min |
| Aug 1, 3:47 PM CDT | Severe Thunderstorm Warning | DVN | Henry | 73 min |
| Aug 1, 4:05 PM CDT | Tornado Warning | DVN | Henry | 55 min |
| Aug 1, 4:05 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall | 55 min |
| Aug 1, 4:30 PM CDT | Severe Thunderstorm Warning | LOT | DuPage | 45 min |
| Aug 1, 4:39 PM CDT | Severe Thunderstorm Warning | LOT | Will | 21 min |
| Aug 1, 4:46 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle | 29 min |
| Aug 1, 4:56 PM CDT | Severe Thunderstorm Warning | LOT | Grundy | 49 min |
| Aug 1, 5:12 PM CDT | Severe Thunderstorm Warning | LOT | Kendall, Will | 63 min |
| Aug 1, 5:18 PM CDT | Flash Flood Warning | LOT | Grundy | 4 hr |
| Aug 1, 5:20 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle | 40 min |
| Aug 1, 5:58 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, LaSalle | 47 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 7.0 hours before the alert went out and 76 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
- 1279 J/kg
- Mixed-layer CIN
- -100 J/kg
- Mixed-layer LCL
- 1232 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 8:19 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Jo Daviess, Ogle, Stephenson, Winnebago | 116 min |
| Aug 1, 10:59 AM CDT | Mesoscale Discussion | SPC | Bureau, DeKalb, Ford, Fulton, Grundy, Henderson and 20 more | 2 hr |
| Aug 1, 2:58 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more | 2 hr |
| Aug 1, 3:20 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more | 6 hr |
| Aug 1, 5:49 PM CDT | Mesoscale Discussion | SPC | Boone, Brown, Bureau, Cass, DeKalb, Fulton and 29 more | 86 min |
| Jul 31, 11:14 PM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Boone, Bremer, Buchanan, Butler and 13 more | 2 hr |
| Jul 31, 7:12 PM CDT | Mesoscale Discussion | SPC | Barton, Cedar, Christian, Dade, Dallas, Douglas and 14 more | 93 min |
| Aug 1, 10:35 AM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bates, Benton, Camden, Cass and 35 more | 2 hr |
| Aug 1, 2:20 PM CDT | Severe Thunderstorm Watch | SPC | Barry, Barton, Camden, Cedar, Christian, Dade and 21 more | 6 hr |
| Aug 1, 6:08 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Cedar, Christian, Dade, Dallas and 13 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2003Severe Thunderstorm Watches in Iowa, 2003Severe Thunderstorm Watches in Missouri, 2003Every severe thunderstorm watch in 2003
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.