Alert archive / Illinois / Tornado Watches in 1998
Tornado Watch 215
The Storm Prediction Center issued this tornado watch at Apr 15, 1998, 3:15 PM CDT for 38 counties in Illinois; Lake County, Porter County, Indiana; Allegan County, Berrien County, Van Buren County, Michigan. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 1998, 3:15 PM CDT (20:15 UTC)
- Expired
- Apr 15, 1998, 9:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 43 counties
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, 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, Lake County, IN, Porter County, IN, Allegan County, MI, Berrien County, MI, Van Buren County, MI
The radar
The Quad Cities radar (KDVN), 105 km from the middle of the area, began a volume at 20:17 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
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 3:36 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Whiteside | 49 min |
| Apr 15, 3:53 PM CDT | Tornado Warning | DVN | Bureau, Henry, Whiteside | 32 min |
| Apr 15, 4:20 PM CDT | Tornado Warning | DVN | Henderson, Warren | 50 min |
| Apr 15, 4:25 PM CDT | Tornado Warning | DVN | Bureau | 50 min |
| Apr 15, 4:36 PM CDT | Severe Thunderstorm Warning | LOT | Lee | 49 min |
| Apr 15, 4:38 PM CDT | Tornado Warning | ILX | Knox | 37 min |
| Apr 15, 5:02 PM CDT | Tornado Warning | DVN | Mercer | 48 min |
| Apr 15, 5:19 PM CDT | Tornado Warning | LOT | LaSalle, Lee | 31 min |
| Apr 15, 8:15 PM CDT | Severe Thunderstorm Warning | DVN | Hancock, McDonough | 50 min |
| Apr 15, 8:32 PM CDT | Severe Thunderstorm Warning | ILX | McLean | 43 min |
| Apr 15, 8:53 PM CDT | Severe Thunderstorm Warning | ILX | Fulton, Knox | 52 min |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 8.3 hours before the alert went out and 99 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 667 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 344 m²/s²
- 0-3 km storm-relative helicity
- 446 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 |
|---|---|---|---|---|
| Apr 15, 4:30 PM CDT | Tornado Watch | SPC | Alexander, Clay, Clinton, Edwards, Franklin, Gallatin and 22 more | 7 hr |
Nearby
Tornado Watches in Illinois, 1998Tornado Watches in Michigan, 1998Tornado Watches in Indiana, 1998Every tornado watch in 1998
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.