Alert archive / Illinois / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 96, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at May 12, 1998, 7:49 PM CDT for Macoupin County, Illinois. It was in force for 61 min. 6 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
- May 12, 1998, 7:49 PM CDT (00:49 UTC)
- Expired
- May 12, 1998, 8:50 PM CDT
- In force
- 61 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Macoupin County, IL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 12, 8:06 PM CDT | Hail 1.75 | Modesto, IL | |
| May 12, 8:11 PM CDT | Hail 1.25 | Palmyra, IL | |
| May 12, 8:15 PM CDT | Hail 1.75 | Palmyra, IL | |
| May 12, 8:16 PM CDT | Tornado F1 | Palmyra, IL | |
| May 12, 8:36 PM CDT | Hail 0.75 | Girard, IL | |
| May 12, 8:46 PM CDT | Hail 0.75 | Standard City, 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 |
|---|---|---|---|
| May 12, 7:30 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 0.8 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
- 1906 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 1317 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 190 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 6.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSTL 130049 RRA SVRSTL ILC117-130150- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 749 PM CDT TUE MAY 12 1998 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... MACOUPIN COUNTY IN SOUTHWESTERN ILLINOIS * UNTIL 850 PM CDT * AT 746 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS NEAR GREENEFIELD AND ANOTHER STORM 8 MILES NORTHWEST OF PALMYRA... MOVING EAST AT 20 MPH. * LOCATIONS THAT WILL BE AFFECTED... GERRARD VIRDEN MODESTO HAGAMAN READER SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND GUSTS IN EXCESS OF 60 MPH...DAMAGING HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OR YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. FG/DLF
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 12, 7:40 PM CDT, 9 minutes before
ILZ095>097-MOZ009-010-018-019-026-027-034>036-042-130145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 740 PM CDT TUE MAY 12 1998 ...SEVERE THUNDERSTORM WATCH 334 HAS BEEN CANCELLED... SEVERE THUNDERSTORM WATCH 334 THAT WAS IN EFFECT FOR PORTIONS OF NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS HAS BEEN CANCELLED. THIS INCLUDES THE MISSOURI COUNTIES OF... SCOTLAND CLARK KNOX LEWIS SHELBY MARION MONROE RALLS PIKE AUDRAIN AND THE ILLINOIS COUNTIES OF... ADAMS BROWN PIKE METZE
Special weather statement, May 12, 7:40 PM CDT, 9 minutes before
ILZ095>097-MOZ009-010-018-019-026-027-034>036-042-130145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 740 PM CDT TUE MAY 12 1998 ...SEVERE THUNDERSTORM WATCH 334 HAS BEEN CANCELLED... SEVERE THUNDERSTORM WATCH 334 THAT WAS IN EFFECT FOR PORTIONS OF NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS HAS BEEN CANCELLED. THIS INCLUDES THE MISSOURI COUNTIES OF... SCOTLAND CLARK KNOX LEWIS SHELBY MARION MONROE RALLS PIKE AUDRAIN AND THE ILLINOIS COUNTIES OF... ADAMS BROWN PIKE METZE
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 7:04 PM CDT | Severe Thunderstorm Warning | LSX | Greene | 51 min |
| May 12, 8:16 PM CDT | Tornado Warning | LSX | Macoupin | 49 min |
| May 12, 8:43 PM CDT | Severe Thunderstorm Warning | LSX | Montgomery | 47 min |
| May 12, 9:54 PM CDT | Severe Thunderstorm Warning | LSX | Macoupin | 46 min |
| May 12, 9:56 PM CDT | Severe Thunderstorm Warning | LSX | Montgomery | 49 min |
| May 12, 10:08 PM CDT | Tornado Warning | LSX | Montgomery | 47 min |
| May 12, 10:36 PM CDT | Severe Thunderstorm Warning | LSX | Macoupin | 49 min |
| May 12, 11:00 PM CDT | Severe Thunderstorm Warning | LSX | Montgomery | 50 min |
| May 12, 11:22 PM CDT | Severe Thunderstorm Warning | LSX | Macoupin | 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.