Alert archive / Illinois / Severe Thunderstorm Watches in 1997
Severe Thunderstorm Watch 147
The Storm Prediction Center issued this severe thunderstorm watch at Apr 5, 1997, 4:15 PM CST for 4 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 5, 1997, 4:15 PM CST (22:15 UTC)
- Expired
- Apr 5, 1997, 8:00 PM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 35 counties
Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Putnam County, IL, Stephenson County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Jasper County, IN, Newton County, IN, Houston County, MN, Columbia County, WI, Crawford County, WI, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Lafayette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Vernon County, WI, Walworth County, WI
The radar
The Milwaukee radar (KMKX), 72 km from the middle of the area, began a volume at 22:10 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
18 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 4:15 PM CST | Severe Thunderstorm Warning | DVN | Stephenson | 45 min |
| Apr 5, 4:24 PM CST | Severe Thunderstorm Warning | ARX | Crawford | 61 min |
| Apr 5, 4:24 PM CST | Severe Thunderstorm Warning | ARX | Grant | 61 min |
| Apr 5, 4:26 PM CST | Severe Thunderstorm Warning | LOT | DeKalb, Grundy, Kendall, LaSalle | 34 min |
| Apr 5, 4:26 PM CST | Severe Thunderstorm Warning | LOT | Lee | 34 min |
| Apr 5, 4:39 PM CST | Severe Thunderstorm Warning | MKX | Green | 66 min |
| Apr 5, 4:52 PM CST | Severe Thunderstorm Warning | ARX | Houston | 38 min |
| Apr 5, 4:52 PM CST | Severe Thunderstorm Warning | ARX | Richland, Vernon | 38 min |
| Apr 5, 4:58 PM CST | Severe Thunderstorm Warning | MKX | Dane, Iowa | 77 min |
| Apr 5, 4:58 PM CST | Severe Thunderstorm Warning | MKX | Rock | 77 min |
| Apr 5, 4:59 PM CST | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Kankakee | 31 min |
| Apr 5, 4:59 PM CST | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Kane, Kendall, McHenry | 31 min |
| Apr 5, 4:59 PM CST | Severe Thunderstorm Warning | LOT | Grundy, Will | 31 min |
| Apr 5, 4:59 PM CST | Severe Thunderstorm Warning | LOT | DuPage | 31 min |
| Apr 5, 5:16 PM CST | Severe Thunderstorm Warning | MKX | Jefferson, Walworth | 74 min |
| Apr 5, 5:16 PM CST | Severe Thunderstorm Warning | MKX | Columbia, Sauk | 74 min |
| Apr 5, 5:26 PM CST | Severe Thunderstorm Warning | LOT | Cook, Lake, McHenry | 34 min |
| Apr 5, 5:26 PM CST | Severe Thunderstorm Warning | LOT | DuPage, Kankakee, Will | 34 min |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 10.3 hours before the alert went out and 148 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
- 515 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 99 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 5, 2:30 PM CST | Severe Thunderstorm Watch | SPC | Bureau, Carroll, Henry, Jo Daviess, Knox, LaSalle and 8 more | 5 hr |
| Apr 5, 2:30 PM CST | Severe Thunderstorm Watch | SPC | Bond, Cass, Champaign, Christian, Clark, Clay and 34 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 1997Severe Thunderstorm Watches in Wisconsin, 1997Severe Thunderstorm Watches in Indiana, 1997Every severe thunderstorm watch in 1997
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.