Alert archive / Illinois / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 32, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 7, 1998, 4:34 PM CDT for Macoupin County, Illinois. It was in force for 41 min. 1 report 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 7, 1998, 4:34 PM CDT (21:34 UTC)
- Expired
- Apr 7, 1998, 5:15 PM CDT
- In force
- 41 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Macoupin County, IL
The radar
The St Louis radar (KLSX), 91 km from the middle of the area, began a volume at 21:35 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 7, 5:00 PM CDT | Hail 0.75 | Girard, IL | The local newspaper reported 3/4 inch hail fell in Girard. |
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 7, 4:15 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 9.6 hours before the alert went out and 150 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
- 1568 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
771 WUUS1 KSTL 072135 RRA SVRSTL ILC117-072215- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 434 PM CDT TUE APR 7 1998 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 515 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN CENTRAL ILLINOIS ...MACOUPIN COUNTY AT 434 PM...A SEVERE THUINDERSTORM WAS LOCATED 5 MILES EAST OF MEDORA. THE STORM WAS MOVING TO THE NORTHEAST AT 30 MPH. THE TOWNS IN THE PATH ARE CARLINVILLE AND GIRARD. THIS IS A DANGEROUS STORM BE PREPARED FOR DAMAGING WINDS...HAIL AND DEADLY LIGHTNING. STAY INSIDE AND AWAY FROM WINDOWS. GKS/DM
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Apr 7, 11:30 AM CDT, 5 hours 4 minutes before
ILZ058>060-064-065-069-070-074-079-095>102-MOZ009-010-018-019-026- 027-034>036-041-042-047>052-059>065-072>075-084-085-099-080600- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 1130 AM CDT TUE APR 7 1998 THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN ST LOUIS. AREAS INCLUDED ARE PORTIONS OF NORTHEAST...CENTRAL...EAST CENTRAL AND SOUTHEAST MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE EASTERN PART OF THE COUNTY WARNING AREA. THE SLIGHT RISK AREA IS EAST A LINE FROM MEMPHIS IN SCOTLAND COUNTY TO MEXICO IN AUDRAIN COUNTY TO CENTERVILLE IN REYNOLDS COUNTY. THE THREAT OF SEVERE THUNDERSTORMS WILL BE MAINLY DURING THE AFTERNOON AND EVENING HOURS AS A FRONT MOVES INTO EASTERN MISSOURI. STORM SPOTTER ACTIVATION MAY BE REQUIRED DURING THE AFTERNOON AND EVENING HOURS. TPS
Special weather statement, Apr 7, 11:30 AM CDT, 5 hours 4 minutes before
ILZ058>060-064-065-069-070-074-079-095>102-MOZ009-010-018-019-026- 027-034>036-041-042-047>052-059>065-072>075-084-085-099-080600- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 1130 AM CDT TUE APR 7 1998 THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN ST LOUIS. AREAS INCLUDED ARE PORTIONS OF NORTHEAST...CENTRAL...EAST CENTRAL AND SOUTHEAST MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE EASTERN PART OF THE COUNTY WARNING AREA. THE SLIGHT RISK AREA IS EAST A LINE FROM MEMPHIS IN SCOTLAND COUNTY TO MEXICO IN AUDRAIN COUNTY TO CENTERVILLE IN REYNOLDS COUNTY. THE THREAT OF SEVERE THUNDERSTORMS WILL BE MAINLY DURING THE AFTERNOON AND EVENING HOURS AS A FRONT MOVES INTO EASTERN MISSOURI. STORM SPOTTER ACTIVATION MAY BE REQUIRED DURING THE AFTERNOON AND EVENING HOURS. TPS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 7, 3:55 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 35 min |
| Apr 7, 4:05 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 25 min |
| Apr 7, 4:44 PM CDT | Tornado Warning | LSX | Macoupin | 46 min |
| Apr 7, 4:50 PM CDT | Severe Thunderstorm Warning | LSX | Brown | 40 min |
| Apr 7, 5:08 PM CDT | Severe Thunderstorm Warning | LSX | Montgomery | 37 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 1998Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.