Alert archive / Missouri / Severe Thunderstorm Watches in 1997
Severe Thunderstorm Watch 164
The Storm Prediction Center issued this severe thunderstorm watch at Apr 20, 1997, 9:00 PM CDT for 12 counties in Illinois; Ballard County, Kentucky; 22 counties in Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 1997, 9:00 PM CDT (02:00 UTC)
- Expired
- Apr 21, 1997, 3:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 35 counties
Alexander County, IL, Franklin County, IL, Hamilton County, IL, Jackson County, IL, Johnson County, IL, Perry County, IL, Pulaski County, IL, Randolph County, IL, Saline County, IL, Union County, IL, White County, IL, Williamson County, IL, Ballard County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Crawford County, MO, Dent County, MO, Howell County, MO, Iron County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Washington County, MO, Wayne County, MO
The radar
The Paducah radar (KPAH), 168 km from the middle of the area, began a volume at 02:04 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
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 9:45 PM CDT | Severe Thunderstorm Warning | SGF | Howell, Texas | 45 min |
| Apr 20, 10:34 PM CDT | Severe Thunderstorm Warning | SGF | Howell | 46 min |
| Apr 20, 11:20 PM CDT | Severe Thunderstorm Warning | PAH | Alexander, Pulaski, Union | 40 min |
| Apr 20, 11:20 PM CDT | Severe Thunderstorm Warning | PAH | Johnson | 40 min |
| Apr 20, 11:20 PM CDT | Severe Thunderstorm Warning | PAH | Stoddard | 40 min |
| Apr 20, 11:37 PM CDT | Severe Thunderstorm Warning | PAH | Ballard, McCracken | 33 min |
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 2.0 hours before the alert went out and 280 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
- 320 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 1699 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 224 m²/s²
- 0-3 km storm-relative helicity
- 390 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 4.5
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 20, 10:00 PM CDT | Severe Thunderstorm Watch | SPC | Butler, Carter, Douglas, Howell, Oregon, Ozark and 4 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Missouri, 1997Severe Thunderstorm Watches in Illinois, 1997Severe Thunderstorm Watches in Kentucky, 1997Every severe thunderstorm watch in 1997
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.