Alert archive / Missouri / Tornado Watches in 1998
Tornado Watch 218
The Storm Prediction Center issued this tornado watch at Apr 15, 1998, 7:00 PM CDT for Madison County, Monroe County, Saint Clair County, Illinois; 34 counties in Missouri. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 1998, 7:00 PM CDT (00:00 UTC)
- Expired
- Apr 15, 1998, 11:00 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 37 counties
Madison County, IL, Monroe County, IL, Saint Clair County, IL, Callaway County, MO, Camden County, MO, Carter County, MO, Christian County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Maries County, MO, Miller County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Phelps County, MO, Pulaski County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO
The radar
The Springfield radar (KSGF), 120 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.
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 7:00 PM CDT | Tornado Warning | LSX | Monroe, Saint Clair | 65 min |
| Apr 15, 7:57 PM CDT | Severe Thunderstorm Warning | SGF | Taney | 63 min |
| Apr 15, 8:28 PM CDT | Severe Thunderstorm Warning | SGF | Douglas, Ozark | 37 min |
| Apr 15, 8:49 PM CDT | Severe Thunderstorm Warning | LSX | Iron | 46 min |
| Apr 15, 9:09 PM CDT | Severe Thunderstorm Warning | SGF | Howell, Texas | 36 min |
| Apr 15, 9:17 PM CDT | Severe Thunderstorm Warning | SGF | Greene, Webster | 33 min |
| Apr 15, 9:22 PM CDT | Severe Thunderstorm Warning | LSX | Sainte Genevieve, Saint Francois | 63 min |
| Apr 15, 9:31 PM CDT | Severe Thunderstorm Warning | SGF | Ozark | 29 min |
| Apr 15, 9:43 PM CDT | Severe Thunderstorm Warning | SGF | Howell, Shannon | 47 min |
| Apr 15, 10:45 PM CDT | Flash Flood Warning | SGF | Howell, Shannon | 4 hr |
| Apr 15, 10:45 PM CDT | Flash Flood Warning | SGF | Ozark | 4 hr |
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 0.0 hours before the alert went out and 166 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
- 576 J/kg
- Mixed-layer CIN
- -58 J/kg
- Mixed-layer LCL
- 731 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 138 m²/s²
- 0-3 km storm-relative helicity
- 226 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 4.8
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 8:45 PM CDT | Tornado Watch | SPC | Crawford, Lawrence, Wabash | 5 hr |
| Apr 15, 11:00 PM CDT | Tornado Watch | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 12 more | 5 hr |
| Apr 16, 12:00 AM CDT | Tornado Watch | SPC | Dunklin, Pemiscot | 5 hr |
| Apr 16, 7:30 AM CDT | Severe Thunderstorm Watch | SPC | Dunklin, Pemiscot | 6 hr |
Nearby
Tornado Watches in Missouri, 1998Tornado Watches in Illinois, 1998Every tornado watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.