Alert archive / Missouri / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 22, NWS St. Louis, MO

April 18, 1997Pike County, Illinois; Marion County, Pike County, Ralls County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 18, 1997, 8:58 PM CDT for Pike County, Illinois; Marion County, Pike County, Ralls County, Missouri. It was in force for 47 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
Apr 18, 1997, 8:58 PM CDT (01:58 UTC)
Expired
Apr 18, 1997, 9:45 PM CDT
In force
47 min
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Pike County, IL, Marion County, MO, Pike County, MO, Ralls County, MO

The radar

The St Louis radar (KLSX), 111 km from the middle of the area, began a volume at 01:58 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
Apr 18, 9:00 PM CDTHail 0.75Hannibal, MO
Apr 18, 9:10 PM CDTHail 1Hannibal, MO
Apr 18, 9:40 PM CDTHail 0.88Bowling Green, 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

Davenport, (KDVN), launched 00:00Z, 2.0 hours before the alert went out and 237 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, Davenport, at 00:00Z on 1997-04-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Davenport, at 00:00Z on 1997-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.19395878Sfc1 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
2061 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
240 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.

345 
WUUS1 KSTL 190159 RRA
SVRSTL
ILC149-MOC163-127-173-190245-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
858 PM CDT FRI APR 18 1997
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  945 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN WEST CENTRAL ILLINOIS
 
   ...PIKE COUNTY
 
 
IN EAST CENTRAL MISSOURI
 
   ...PIKE COUNTY
 
IN NORTHEAST MISSOURI
 
   ...SOUTHERN MARION COUNTY...RALLS COUNTY
 
AT 855 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM JUST NORTHWEST OF
HANNIBAL...MOVING SOUTHEAST AT 30 MPH.
 
SAVERTON...ATLAS...AND LOUISIANA ARE IN THE PATH OF THIS STORM.
 
HAIL OF AT LEAST 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.

IssuedProductOfficeCountiesLasted
Apr 18, 8:51 PM CDTSevere Thunderstorm WarningLSXCalhoun39 min
Apr 18, 9:45 PM CDTSevere Thunderstorm WarningLSXCalhoun45 min
Apr 18, 10:20 PM CDTSevere Thunderstorm WarningLSXMadison, Saint Clair40 min
Apr 18, 11:17 PM CDTSevere Thunderstorm WarningLSXGreene, Jersey, Macoupin, Madison43 min
Apr 18, 11:56 PM CDTSevere Thunderstorm WarningLSXJersey, Madison49 min
Apr 19, 12:34 AM CDTSevere Thunderstorm WarningLSXClinton, Saint Clair, Washington41 min
Apr 18, 8:07 PM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson, Saint Louis38 min
Apr 18, 8:42 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Warren33 min
Apr 18, 9:00 PM CDTSevere Thunderstorm WarningLSXBoone, Callaway45 min
Apr 18, 9:58 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis32 min
Apr 18, 9:58 PM CDTSevere Thunderstorm WarningLSXCity of Saint Louis32 min
Apr 18, 10:07 PM CDTSevere Thunderstorm WarningLSXCole, Moniteau38 min
Apr 18, 10:25 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis50 min
Apr 18, 10:54 PM CDTSevere Thunderstorm WarningLSXBoone51 min
Apr 19, 1:11 AM CDTSevere Thunderstorm WarningLSXFranklin34 min

Nearby

Severe Thunderstorm Warnings in Missouri, 1997Severe Thunderstorm Warnings in Illinois, 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.