Alert archive / Illinois / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 32, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 18, 1997, 11:56 PM CDT for Jersey County, Madison County, Illinois. It was in force for 49 min. 3 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 18, 1997, 11:56 PM CDT (04:56 UTC)
- Expired
- Apr 19, 1997, 12:45 AM CDT
- In force
- 49 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Jersey County, IL, Madison County, IL
The radar
The St Louis radar (KLSX), 56 km from the middle of the area, began a volume at 04:56 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 19, 12:12 AM CDT | Hail 1.75 | Godfrey, IL | |
| Apr 19, 12:14 AM CDT | Hail 1.75 | Alton, IL | |
| Apr 19, 12:37 AM CDT | Hail 0.75 | Collinsville, IL |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 18, 9:15 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 4.9 hours before the alert went out and 187 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
- 2539 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 257 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
144 WUUS1 KSTL 190458 RRA SVRSTL ILC083-119-190545- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 1156 PM CDT FRI APR 18 1997 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1245 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTHWEST ILLINOIS ...JERSEY COUNTY...MADISON COUNTY AT 1157 PM A SEVERE THUNDERSTORM WAS 5 MILES SOUTHWEST OF JERSEYVILLE MOVING SOUTHEAST AT 30 MPH. TOWNS IN THE PATH INCLUDE ALTON AND EDWARDSVILLE. HAIL AROUND 1 INCH IN DIAMETER CAN BE EXPECTED WITH THIS STORM. JPK
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 8:51 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 39 min |
| Apr 18, 8:58 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 47 min |
| Apr 18, 9:45 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 45 min |
| Apr 18, 10:20 PM CDT | Severe Thunderstorm Warning | LSX | Madison, Saint Clair | 40 min |
| Apr 18, 11:17 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Jersey, Macoupin, Madison | 43 min |
| Apr 19, 12:34 AM CDT | Severe Thunderstorm Warning | LSX | Clinton, Saint Clair, Washington | 41 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.