Alert archive / Illinois / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 69, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at May 1, 1998, 5:44 PM CDT for Macoupin County, Illinois. It was in force for 46 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
- May 1, 1998, 5:44 PM CDT (22:44 UTC)
- Expired
- May 1, 1998, 6:30 PM CDT
- In force
- 46 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 22:43 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 |
|---|---|---|---|
| May 1, 5:50 PM CDT | Hail 1 | Carlinville, IL | Storm spotters reported 1 inch hail. |
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 nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.7 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
- 147 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 505 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 38 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
483 WUUS1 KSTL 012245 RRA SVRSTL ILC117-012330- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 544 PM CDT FRI MAY 1 1998 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL AND SOUTHERN MACOUPIN COUNTY IN SOUTHWESTERN ILLINOIS * UNTIL 630 PM CDT * AT AT 540 PM CDT...SEVERE STORM SPOTTERS INDICATED A SEVERE THUNDERSTORM OVER CARLINVILLE... MOVING MOVING SOUTH AT 15 MPH. * LOCATIONS THAT WILL BE AFFECTED... CARLINVILLE MACOUPIN STATION GILLESPIE AT 540 PM 3/4 INCH HAIL WAS REPORTED BY A STORM SPOTTER IN CARLINVILLE. THIS STORM HAS A HISTORY OF DAMAGING HAIL. STAY INSIDE AND AWAY FROM WINDOWS. WDB &
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, May 1, 2:15 PM CDT, 3 hours 29 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>075-084-085-099-020100- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 215 PM CDT FRI MAY 1 1998 THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NWS OFFICE IN ST LOUIS. AREAS INCLUDED ARE PARTS OF CENTRAL...NORTHEAST AND EAST CENTRAL MISSOURI...AND SOUTHWEST ILLINOIS. THUNDERSTORMS WILL BE SCATTERED ACROSS THE AREA THIS AFTERNOON AND EARLY THIS EVENING. A FEW OF THESE STORMS MAY PRODUCE HAIL AND HEAVY RAIN...HOWEVER NO WIDESPREAD SEVERE WEATHER IS EXPECTED. ALTHOUGH A FEW OF THE STORMS MAY BRIEFLY APPROACH SEVERE LIMITS...AT THIS TIME SPOTTER ACTIVITION IS NOT ANTICIPATED. TRUETT
Special weather statement, May 1, 2:15 PM CDT, 3 hours 29 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>075-084-085-099-020100- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 215 PM CDT FRI MAY 1 1998 THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NWS OFFICE IN ST LOUIS. AREAS INCLUDED ARE PARTS OF CENTRAL...NORTHEAST AND EAST CENTRAL MISSOURI...AND SOUTHWEST ILLINOIS. THUNDERSTORMS WILL BE SCATTERED ACROSS THE AREA THIS AFTERNOON AND EARLY THIS EVENING. A FEW OF THESE STORMS MAY PRODUCE HAIL AND HEAVY RAIN...HOWEVER NO WIDESPREAD SEVERE WEATHER IS EXPECTED. ALTHOUGH A FEW OF THE STORMS MAY BRIEFLY APPROACH SEVERE LIMITS...AT THIS TIME SPOTTER ACTIVITION IS NOT ANTICIPATED. TRUETT
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 1, 6:18 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Jersey | 47 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.