Alert archive / Missouri / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 86, NWS St. Louis, MO

May 25, 1997Jefferson County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 25, 1997, 8:46 PM CDT for Jefferson County, Missouri. It was in force for 44 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
May 25, 1997, 8:46 PM CDT (01:46 UTC)
Expired
May 25, 1997, 9:30 PM CDT
In force
44 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Jefferson County, MO

The radar

The St Louis radar (KLSX), 50 km from the middle of the area, began a volume at 01:50 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

TimeReportWhereRemark
May 25, 8:50 PM CDTHail 0.75Barnhart, MOCounty sheriff reported 3/4 inch hail.
May 25, 9:00 PM CDTHail 0.75De Soto, MOSkywarn spotters reported 3/4 inch hail.
May 25, 9:00 PM CDTThunderstorm Wind 50De Soto, MODe Soto police reported trees and power lines down.

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, 1.8 hours before the alert went out and 268 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.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 1997-05-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 1997-05-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 63 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
551 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
63 m²/s²
0-3 km storm-relative helicity
81 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

274 
WUUS1 KSTL 260148 RRA
SVRSTL
MOC099-260230-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
846 PM CDT SUN MAY 25 1997
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  930 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN EAST CENTRAL MISSOURI
 
   ...JEFFERSON COUNTY
 
AT 845 PM CDT...NWS DOPPLER RADAR SHOWED A LINE OF SEVERE THUNDERSTORMS
OVER WESTERN JEFFERSON COUNTY MOVING TO THE EAST AT 30 MPH. SOME TOWNS
IN THE PATH IN THE LINE OF STORMS ARE ARNOLD...HILLSBORO...PEVELY...
AND IMPERIAL.
 
DAMAGING WINDS IS THE PRIMARY THREAT OF SEVERE WEATHER WITH THIS LINE.
 
THIS STORM HAS A HISTORY OF DAMAGING WINDS. SEEK INSIDE SHELTER
NOW
 
BW/RP

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 25, 7:13 PM CDTSevere Thunderstorm WarningLSXGasconade47 min
May 25, 7:14 PM CDTSevere Thunderstorm WarningLSXFranklin, Saint Louis46 min
May 25, 7:36 PM CDTSevere Thunderstorm WarningLSXFranklin54 min
May 25, 7:49 PM CDTSevere Thunderstorm WarningLSXJefferson56 min
May 25, 8:12 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Warren33 min
May 25, 8:18 PM CDTSevere Thunderstorm WarningLSXCrawford, Washington42 min
May 25, 9:24 PM CDTSevere Thunderstorm WarningLSXSainte Genevieve51 min
May 25, 10:47 PM CDTSevere Thunderstorm WarningLSXWashington43 min
May 26, 3:15 AM CDTFlash Flood WarningLSXCole, Osage3 hr
May 26, 4:43 AM CDTSevere Thunderstorm WarningLSXSainte Genevieve, Saint Francois47 min
May 26, 2:29 PM CDTSevere Thunderstorm WarningLSXMadison31 min
May 26, 5:39 PM CDTSevere Thunderstorm WarningLSXMadison51 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.