Alert archive / Illinois / Severe Thunderstorm Watches in 2000
Severe Thunderstorm Watch 183
The Storm Prediction Center issued this severe thunderstorm watch at Apr 20, 2000, 12:45 AM CDT for 34 counties in Illinois; Scott County, Iowa. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2000, 12:45 AM CDT (05:45 UTC)
- Expired
- Apr 20, 2000, 6:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 35 counties
Scott County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Fulton County, IL, Grundy County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall 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
The radar
The Quad Cities radar (KDVN), 81 km from the middle of the area, began a volume at 05:45 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
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 12:50 AM CDT | Severe Thunderstorm Warning | DVN | Henderson | 40 min |
| Apr 20, 1:22 AM CDT | Severe Thunderstorm Warning | LOT | Ford, Livingston | 38 min |
| Apr 20, 1:30 AM CDT | Severe Thunderstorm Warning | DVN | Warren | 45 min |
| Apr 20, 1:34 AM CDT | Severe Thunderstorm Warning | ILX | Knox | 41 min |
| Apr 20, 1:46 AM CDT | Severe Thunderstorm Warning | DVN | Henry | 34 min |
| Apr 20, 2:03 AM CDT | Severe Thunderstorm Warning | ILX | Stark | 42 min |
| Apr 20, 4:46 AM CDT | Severe Thunderstorm Warning | DVN | Henderson, Mercer, Warren | 44 min |
| Apr 20, 4:56 AM CDT | Severe Thunderstorm Warning | ILX | Knox | 49 min |
| Apr 20, 5:09 AM CDT | Severe Thunderstorm Warning | DVN | Henry, Rock Island | 51 min |
| Apr 20, 5:21 AM CDT | Severe Thunderstorm Warning | ILX | Fulton, Mason | 54 min |
| Apr 20, 5:33 AM CDT | Severe Thunderstorm Warning | ILX | Stark | 27 min |
| Apr 20, 5:45 AM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall, Will | 30 min |
| Apr 20, 5:47 AM CDT | Severe Thunderstorm Warning | ILX | Logan, Peoria, Tazewell | 43 min |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 5.8 hours before the alert went out and 75 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
- 4 J/kg
- Mixed-layer CIN
- -616 J/kg
- Mixed-layer LCL
- 865 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 471 m²/s²
- 0-3 km storm-relative helicity
- 491 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 |
|---|---|---|---|---|
| Apr 19, 8:45 PM CDT | Severe Thunderstorm Watch | SPC | Jo Daviess | 4 hr |
| Apr 19, 10:00 PM CDT | Tornado Watch | SPC | Adams, Brown, Cass, Fulton, Hancock, McDonough and 3 more | 6 hr |
| Apr 20, 3:15 AM CDT | Severe Thunderstorm Watch | SPC | Alexander, Jackson, Perry, Randolph, Union | 5 hr |
| Apr 20, 4:15 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Bond, Boone, Brown, Bureau, Calhoun and 61 more | 6 hr |
| Apr 20, 10:00 AM CDT | Tornado Watch | SPC | Bond, Champaign, Clark, Clay, Clinton, Coles and 30 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2000Severe Thunderstorm Watches in Iowa, 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.