Alert archive / Illinois / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 239, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jun 18, 1998, 8:35 PM CDT for Macoupin County, Illinois. It was in force for 50 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
- Jun 18, 1998, 8:35 PM CDT (01:35 UTC)
- Expired
- Jun 18, 1998, 9:25 PM CDT
- In force
- 50 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 01:39 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 |
|---|---|---|---|
| Jun 18, 8:55 PM CDT | Thunderstorm Wind 51 | Girard, IL | |
| Jun 18, 9:10 PM CDT | Hail 0.75 | Scottville, IL | |
| Jun 18, 9:16 PM CDT | Thunderstorm Wind 53 | Girard, 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 |
|---|---|---|---|
| Jun 18, 7:30 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 1.6 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
- 2675 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1092 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 219 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 17.5
The text
As transmitted, in the capitals the NWS used until 2016.
122 WUUS1 KSTL 190136 RRA SVRSTL ILC117-190225- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 835 PM CDT THU JUN 18 1998 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... MACOUPIN COUNTY IN SOUTHWESTERN ILLINOIS * UNTIL 925 PM CDT * AT 834 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM PALMYRA TO NEAR MEDORA... MOVING EAST AT 40 MPH. * LOCATIONS THAT WILL BE AFFECTED... GIRARD CARLINVILLE PALMYRA THE PRIMARY SEVERE WEATHER THREAT IS DAMAGING WINDS. MOVE QUICKLY TO A STURDY BUILDING AND STAY AWAY FROM DOORS AND WINDOWS. GKS/FG
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, Jun 18, 6:24 PM CDT, 2 hours 11 minutes before
MOZ009-010-018-019-026-190130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 624 PM CDT THU JUN 18 1998 ...THE SEVERE THUNDERSTORM WATCH FOR PARTS OF NORTHEAST MISSOURI HAS BEEN CANCELLED... THE SEVERE THUNDERSTORM WATCH FOR SCOTLAND...CLARK...KNOX...LEWIS AND SHELBY COUNTIES IN NORTHEAST MISSOURI IS NO LONGER IN EFFECT. THE SEVERE THUNDERSTORMS HAVE MOVED EAST OF THE AREA. FERRY
Special weather statement, Jun 18, 6:24 PM CDT, 2 hours 11 minutes before
MOZ009-010-018-019-026-190130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 624 PM CDT THU JUN 18 1998 ...THE SEVERE THUNDERSTORM WATCH FOR PARTS OF NORTHEAST MISSOURI HAS BEEN CANCELLED... THE SEVERE THUNDERSTORM WATCH FOR SCOTLAND...CLARK...KNOX...LEWIS AND SHELBY COUNTIES IN NORTHEAST MISSOURI IS NO LONGER IN EFFECT. THE SEVERE THUNDERSTORMS HAVE MOVED EAST OF THE AREA. FERRY
Special weather statement, Jun 18, 8:20 PM CDT, 15 minutes before
ILZ095>097-MOZ027-034>036-041-042-047-048-190315- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 820 PM CDT THU JUN 18 1998 ...THE SEVERE THUNDERSTORM WATCHES FOR PARTS OF NORTHEAST AND CENTRAL MISSOURI AND WEST CENTRAL ILLINOIS HAS BEEN CANCELLED... THE SEVERE THUNDERSTORM WATCHES FOR MARION...MONROE...RALLS... PIKE...AUDRAIN...BOONE...MONITEAU AND COLE COUNTIES IN NORTHEAST AND CENTRAL MISSOURI AND THE WEST CENTRAL ILLINOIS COUNTIES OF ADAMS...BROWN AND PIKE IS NO LONGER IN EFFECT. THE LINE OF SEVERE THUNDERSTORMS HAVE MOVED EAST OF THE AREA. FERRY
Special weather statement, Jun 18, 8:20 PM CDT, 15 minutes before
ILZ095>097-MOZ027-034>036-041-042-047-048-190315- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 820 PM CDT THU JUN 18 1998 ...THE SEVERE THUNDERSTORM WATCHES FOR PARTS OF NORTHEAST AND CENTRAL MISSOURI AND WEST CENTRAL ILLINOIS HAS BEEN CANCELLED... THE SEVERE THUNDERSTORM WATCHES FOR MARION...MONROE...RALLS... PIKE...AUDRAIN...BOONE...MONITEAU AND COLE COUNTIES IN NORTHEAST AND CENTRAL MISSOURI AND THE WEST CENTRAL ILLINOIS COUNTIES OF ADAMS...BROWN AND PIKE IS NO LONGER IN EFFECT. THE LINE OF SEVERE THUNDERSTORMS HAVE MOVED EAST OF THE AREA. FERRY
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 7:55 PM CDT | Tornado Warning | LSX | Greene | 35 min |
| Jun 18, 8:20 PM CDT | Severe Thunderstorm Warning | LSX | Jersey | 35 min |
| Jun 18, 8:57 PM CDT | Severe Thunderstorm Warning | LSX | Montgomery | 48 min |
| Jun 18, 9:27 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 48 min |
| Jun 18, 9:44 PM CDT | Severe Thunderstorm Warning | LSX | Montgomery | 31 min |
| Jun 18, 9:49 PM CDT | Severe Thunderstorm Warning | LSX | Randolph, Saint Clair | 51 min |
| Jun 18, 10:06 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Washington | 49 min |
| Jun 18, 10:39 PM CDT | Severe Thunderstorm Warning | LSX | Marion | 51 min |
| Jun 18, 11:02 PM CDT | Severe Thunderstorm Warning | LSX | Fayette | 48 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.