Alert archive / Missouri / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 63, NWS St. Louis, MO

May 18, 1997Franklin County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 18, 1997, 12:15 AM CDT for Franklin County, Missouri. It was in force for 45 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, 12:15 AM CDT (05:15 UTC)
Expired
May 18, 1997, 1:00 AM CDT
In force
45 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Franklin County, MO

The radar

The St Louis radar (KLSX), 47 km from the middle of the area, began a volume at 05:14 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 17, 10:00 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 5.3 hours before the alert went out and 288 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 1997-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLLFCEL10008507005003002001001 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 1997-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
4 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
2606 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
32 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.

210 
WUUS1 KSTL 180518 RRA
SVRSTL
MOC071-180600-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1215 AM CDT SUN MAY 18 1997
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  100 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN EAST CENTRAL MISSOURI
 
   ...NORTHERN FRANKLIN COUNTY
 
AT 1215 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM JUST SOUTH OF NEW
HAVEN. THIS STORM WAS MOVING SOUTHEAST AT 20 MPH AND WILL AFFECT
THE COMMUNITIES OF UNION AND VILLA RIDGE BY 1230 AM.
 
SEEK SHELTER IN A STURDY BUILDING. REMEMBER SEVERE THUNDERSTORMS
OFTEN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING.
 
CA/DF

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, 7:11 AM CDTSevere Thunderstorm WarningLSXKnox49 min
May 18, 7:42 AM CDTSevere Thunderstorm WarningLSXClark48 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.