Alert archive / Illinois / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 93, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at May 12, 1998, 5:38 PM CDT for Adams County, Illinois; Lewis County, Missouri. It was in force for 62 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 12, 1998, 5:38 PM CDT (22:38 UTC)
- Expired
- May 12, 1998, 6:40 PM CDT
- In force
- 62 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Adams County, IL, Lewis County, MO
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 12, 5:42 PM CDT | Hail 1.75 | La Grange, MO |
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 |
|---|---|---|---|
| May 12, 4:15 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.6 hours before the alert went out and 243 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
- 1323 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
816 WUUS1 KSTL 122237 RRA SVRSTL ILC001-MOC111-122340- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 538 PM CDT TUE MAY 12 1998 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN ADAMS COUNTY IN WEST CENTRAL ILLINOIS SOUTHERN LEWIS COUNTY IN NORTHEASTERN MISSOURI * UNTIL 640 PM CDT * AT 535 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 7 MILES SOUTHWEST OF LA GRANGE... MOVING MOVING EAST AT 20 MPH. * LOCATIONS THAT WILL BE AFFECTED... LA GRANGE WAKONDA STATE PARK MENDON URSA THIS STORM HAS A HISTORY OF DAMAGING HAIL. STAY INSIDE AND AWAY FROM WINDOWS. FG/DLF
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 5:01 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 34 min |
| May 12, 5:20 PM CDT | Severe Thunderstorm Warning | LSX | Brown | 65 min |
| May 12, 5:57 PM CDT | Tornado Warning | LSX | Brown | 63 min |
| May 12, 6:00 PM CDT | Tornado Warning | LSX | Brown | 60 min |
| May 12, 6:28 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 37 min |
| May 12, 3:49 PM CDT | Severe Thunderstorm Warning | LSX | Knox | 46 min |
| May 12, 4:32 PM CDT | Severe Thunderstorm Warning | LSX | Lewis | 63 min |
| May 12, 5:07 PM CDT | Severe Thunderstorm Warning | LSX | Clark | 48 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 1998Severe Thunderstorm Warnings in Missouri, 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.