Alert archive / Illinois / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 140, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Aug 16, 1997, 8:07 PM CDT for LaSalle County, Illinois. It was in force for 68 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 16, 1997, 8:07 PM CDT (01:07 UTC)
- Expired
- Aug 16, 1997, 9:15 PM CDT
- In force
- 68 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
County LaSalle County, IL
The radar
The Chicago radar (KLOT), 73 km from the middle of the area, began a volume at 01:07 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 16, 5:15 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 1.1 hours before the alert went out and 135 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
- 5712 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 995 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 317 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.
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 7:02 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb | 28 min |
| Aug 16, 7:29 PM CDT | Flash Flood Warning | LOT | Cook | 3 hr |
| Aug 16, 8:07 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall, Will | 68 min |
| Aug 16, 9:02 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee | 28 min |
| Aug 17, 1:05 AM CDT | Flash Flood Warning | LOT | Ford | 6 hr |
| Aug 17, 2:45 AM CDT | Flash Flood Warning | LOT | Livingston | 6 hr |
| Aug 16, 7:09 PM CDT | Tornado Warning | LOT | LaPorte | 36 min |
| Aug 16, 7:48 PM CDT | Severe Thunderstorm Warning | LOT | LaPorte, Saint Joseph | 42 min |
| Aug 16, 7:59 PM CDT | Tornado Warning | LOT | Saint Joseph | 31 min |
| Aug 16, 8:16 PM CDT | Severe Thunderstorm Warning | LOT | Elkhart | 29 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 1997Every severe thunderstorm warning 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.