Alert archive / Missouri / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 70, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at May 18, 1997, 9:35 PM CDT for Lewis County, Missouri. It was in force for 55 min. 1 report 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 18, 1997, 9:35 PM CDT (02:35 UTC)
- Expired
- May 18, 1997, 10:30 PM CDT
- In force
- 55 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Lewis County, MO
The radar
The St Louis radar (KLSX), 179 km from the middle of the area, began a volume at 02:38 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 18, 9:55 PM CDT | Hail 0.75 | Lewistown, MO | County sheriff reported 3/4 inch hail. |
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 18, 5:30 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 2.6 hours before the alert went out and 198 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
- 2339 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 1544 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 145 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 9.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSTL 190236 RRA SVRSTL MOC111-190330- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 935 PM CDT SUN MAY 18 1997 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1030 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN NORTHEAST MISSOURI ...LEWIS COUNTY AT 935 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS DETECTING A SEVERE THUNDERSTORM NEAR KNOX C`ITY. IT WAS MOVING TO THE EAST AT 30 MPH. IT WILL REACH THE TOWN OF LA BELLE BY 955 PM. THIS STORM HAS A HISTORY OF DAMAGING HAIL. STAY INSIDE AND AWAY FROM WINDOWS. GKS/AMS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 8:02 PM CDT | Severe Thunderstorm Warning | LSX | Scotland | 43 min |
| May 18, 8:22 PM CDT | Severe Thunderstorm Warning | LSX | Clark | 53 min |
| May 18, 8:40 PM CDT | Severe Thunderstorm Warning | LSX | Knox | 50 min |
| May 18, 9:20 PM CDT | Severe Thunderstorm Warning | LSX | Knox, Scotland | 40 min |
| May 18, 10:03 PM CDT | Severe Thunderstorm Warning | LSX | Knox | 42 min |
| May 18, 10:21 PM CDT | Flash Flood Warning | LSX | Knox | 3 hr |
| May 18, 10:49 PM CDT | Severe Thunderstorm Warning | LSX | Knox | 41 min |
Nearby
Severe Thunderstorm Warnings in Missouri, 1997Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.