Alert archive / Illinois / Severe Thunderstorm Watches in 1997
Severe Thunderstorm Watch 302
The Storm Prediction Center issued this severe thunderstorm watch at May 18, 1997, 11:00 PM CDT for 34 counties in Illinois; 19 counties in Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 18, 1997, 11:00 PM CDT (04:00 UTC)
- Expired
- May 19, 1997, 5:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 53 counties
Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, DeWitt County, IL, Douglas County, IL, Ford County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Iroquois County, IL, Jersey County, IL, Kankakee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Tazewell County, IL, Vermilion County, IL, Woodford County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Chariton County, MO, Cooper County, MO, Howard County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Macon County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Shelby County, MO
The radar
The St Louis radar (KLSX), 132 km from the middle of the area, began a volume at 04:01 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
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 11:05 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 40 min |
| May 18, 11:12 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Livingston | 63 min |
| May 19, 12:29 AM CDT | Severe Thunderstorm Warning | LSX | Pike | 31 min |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 4.0 hours before the alert went out and 197 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
- 2339 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 1544 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 145 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 9.0
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 |
|---|---|---|---|---|
| May 18, 8:00 PM CDT | Tornado Watch | SPC | Iroquois | 5 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 1997Severe Thunderstorm Watches in Missouri, 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.