Alert archive / Illinois / Tornado Warnings in 1998
Tornado Warning 36, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Apr 15, 1998, 7:00 PM CDT for Monroe County, Saint Clair County, Illinois. It was in force for 65 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
- Apr 15, 1998, 7:00 PM CDT (00:00 UTC)
- Expired
- Apr 15, 1998, 8:05 PM CDT
- In force
- 65 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Monroe County, IL, Saint Clair County, IL
The radar
The St Louis radar (KLSX), 66 km from the middle of the area, began a volume at 00:02 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 |
|---|---|---|---|
| Apr 15, 7:05 PM CDT | Tornado F0 | Waterloo, IL | |
| Apr 15, 7:15 PM CDT | Tornado F0 | Smithton, IL | |
| Apr 15, 7:20 PM CDT | Hail 1.75 | Freeburg, IL | Spotters reported golfball size hail fell for several minutes. |
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 |
|---|---|---|---|
| Apr 15, 4:30 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 15, 7:00 PM CDT | Tornado Watch | SPC | 4 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 0.0 hours before the alert went out and 234 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
- 426 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 919 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 190 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
049 WFUS1 KSTL 160001 RRA TORSTL ILC133-163-160105- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 700 PM CDT WED APR 15 1998 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * TORNADO WARNING FOR... EASTERN MONROE COUNTY ILLINOIS IN SOUTHWESTERN ILLINOIS SOUTHERN ST CLAIR COUNTY IN SOUTHWESTERN ILLINOIS * UNTIL 805 PM CDT * AT 659 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A TORNADO NEAR WATERLOO... MOVING EAST AT 25 MPH. * LOCATIONS IN THE PATH... WATERLOO HECKER MARRISA NEW ATHENS DOPPLER RADAR IS SHOWING A STRONG TORNADO SIGNAL. IF YOU ARE IN THE PATH MOVE TO A SHELTER NOW A BASEMENT IS BEST...BUT IF NOT AVAILABLE...MOVE TO THE LOWEST LEVEL AND HIDE IN A SMALL INTERIOR ROOM. GET OUT OF MOBILE HOMES AND CARS IN FAVOR OF A STRONG BUILDING. METZE/GLASS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 7:35 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 65 min |
| Apr 15, 7:51 PM CDT | Tornado Warning | LSX | Marion | 49 min |
| Apr 15, 7:57 PM CDT | Severe Thunderstorm Warning | LSX | Washington | 48 min |
Nearby
Tornado Warnings in Illinois, 1998Every tornado warning in 1998Tornadoes 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.