Alert archive / Illinois / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 97, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at May 12, 1998, 8:43 PM CDT for Montgomery County, Illinois. It was in force for 47 min. 2 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, 8:43 PM CDT (01:43 UTC)
- Expired
- May 12, 1998, 9:30 PM CDT
- In force
- 47 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Montgomery County, IL
The radar
The Lincoln radar (KILX), 103 km from the middle of the area, began a volume at 01:42 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 12, 8:45 PM CDT | Hail 0.75 | Farmersville, IL | |
| May 12, 8:45 PM CDT | Hail 0.75 | White Oak, 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, 1.7 hours before the alert went out and 127 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 130142 RRA SVRSTL ILC135-130230- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 843 PM CDT TUE MAY 12 1998 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... MONTGOMERY COUNTY ILLINOIS IN SOUTHWESTERN ILLINOIS * UNTIL 930 PM CDT * AT 833 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES SOUTH OF GIRARD... MOVING EAST AT 20 MPH. * LOCATIONS THAT WILL BE AFFECTED... WAGGONER RAYMOND THE PRIMARY SEVERE WEATHER THREAT IS DAMAGING HAIL. LARGE HAIL CAN CAUSE EXTENSIVE PROPERTY DAMAGE AN SERIOUS INJURY TO PEOPLE CAUGHT OUTDOORS. MOVE INSIDE A STURDY BUILDING IMMEDIATELY. A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. METZE/GLASS
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, 1 hour 3 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, 1 hour 3 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, 7:49 PM CDT | Severe Thunderstorm Warning | LSX | Macoupin | 61 min |
| May 12, 8:16 PM CDT | Tornado Warning | LSX | Macoupin | 49 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; radar from the NEXRAD Level II archive.