Alert archive / Missouri / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 20, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 18, 1997, 8:42 PM CDT for Saint Charles County, Warren County, Missouri. It was in force for 33 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
- Apr 18, 1997, 8:42 PM CDT (01:42 UTC)
- Expired
- Apr 18, 1997, 9:15 PM CDT
- In force
- 33 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Saint Charles County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 22 km from the middle of the area, began a volume at 01:46 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 18, 9:06 PM CDT | Hail 1 | Augusta, MO |
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 nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 1.7 hours before the alert went out and 251 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2539 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 257 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
272 WUUS1 KSTL 190145 RRA SVRSTL MOC183-219-190215- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 842 PM CDT FRI APR 18 1997 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 915 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN EAST CENTRAL MISSOURI ...WESTERN ST. CHARLES COUNTY...EASTERN WARREN COUNTY THE STORM WILL MOVE BETWEEN MARTHASVILLE AND NEW MELLE. DEFIANCE WILL BE IN THE PATH AT 840 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM JUST NORTH OF MARTHASVILLE MOVING EAST AT 35 MPH. HAIL IN EXCESS OF 1 INCH DIAMETER CAN BE EXPECTED WITH THIS STORM. JPK
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 8:07 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Saint Louis | 38 min |
| Apr 18, 8:51 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Pike | 39 min |
| Apr 18, 8:58 PM CDT | Severe Thunderstorm Warning | LSX | Marion, Pike, Ralls | 47 min |
| Apr 18, 9:00 PM CDT | Severe Thunderstorm Warning | LSX | Boone, Callaway | 45 min |
| Apr 18, 9:45 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Pike | 45 min |
| Apr 18, 9:58 PM CDT | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis | 32 min |
| Apr 18, 9:58 PM CDT | Severe Thunderstorm Warning | LSX | City of Saint Louis | 32 min |
| Apr 18, 10:07 PM CDT | Severe Thunderstorm Warning | LSX | Cole, Moniteau | 38 min |
| Apr 18, 10:25 PM CDT | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis | 50 min |
| Apr 18, 10:54 PM CDT | Severe Thunderstorm Warning | LSX | Boone | 51 min |
| Apr 19, 1:11 AM CDT | Severe Thunderstorm Warning | LSX | Franklin | 34 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.