Alert archive / Missouri / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 65, NWS St. Louis, MO

May 18, 1997Clark County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 18, 1997, 7:42 AM CDT for Clark County, Missouri. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 18, 1997, 7:42 AM CDT (12:42 UTC)
Expired
May 18, 1997, 8:30 AM CDT
In force
48 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Clark County, MO

The radar

The Quad Cities radar (KDVN), 165 km from the middle of the area, began a volume at 12:43 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.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 0.7 hours before the alert went out and 170 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 12:00Z on 1997-05-18Temperature 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 12:00Z on 1997-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 266 square meters per square second.193958Sfc1 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
1986 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
266 m²/s²
0-3 km storm-relative helicity
293 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.

986 
WUUS1 KSTL 181243 RRA
SVRSTL
MOC045-181330-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
742 AM CDT SUN MAY 18 1997
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  830 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTHEAST MISSOURI
 
   ...SOUTHERN CLARK COUNTY
 
AT 740 AM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE
THUNDERSTORM NEAR FAIRMONT IN SOUTHERN CLARK COUNTY. THE PRIMARY THREAT
OF SEVERE WEATHER FOR THIS AREA IS DUE TO LARGE HAIL. THE STORM IS
MOVING TO THE EAST SOUTHEAST AT 35 MPH. COMMUNITIES IN THE PATH OF THIS
STORM WILL BE ST. PATRICK. IT SHOULD REACH THAT AREA BETWEEN 800 AND 815
AM THIS MORNING.
 
THIS IS A DANGEROUS STORM BE PREPARED FOR DAMAGING WINDS...HAIL
AND DEADLY LIGHTNING. STAY INSIDE AND AWAY FROM WINDOWS.
 
PEDIGO

The office that day

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

IssuedProductOfficeCountiesLasted
May 17, 8:21 PM CDTSevere Thunderstorm WarningLSXWashington69 min
May 17, 8:48 PM CDTSevere Thunderstorm WarningLSXSaint Francois57 min
May 17, 9:03 PM CDTSevere Thunderstorm WarningLSXIron42 min
May 17, 9:44 PM CDTSevere Thunderstorm WarningLSXCrawford31 min
May 17, 9:49 PM CDTTornado WarningLSXCrawford26 min
May 17, 10:05 PM CDTSevere Thunderstorm WarningLSXWashington40 min
May 17, 10:13 PM CDTSevere Thunderstorm WarningLSXCrawford47 min
May 18, 12:15 AM CDTSevere Thunderstorm WarningLSXFranklin45 min
May 18, 7:11 AM CDTSevere Thunderstorm WarningLSXKnox49 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.