Alert archive / Missouri / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 30, NWS St. Louis, MO

April 18, 1997Boone County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 18, 1997, 10:54 PM CDT for Boone County, Missouri. It was in force for 51 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
Apr 18, 1997, 10:54 PM CDT (03:54 UTC)
Expired
Apr 18, 1997, 11:45 PM CDT
In force
51 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Boone County, MO

The radar

The St Louis radar (KLSX), 145 km from the middle of the area, began a volume at 03:56 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
Apr 18, 9:15 PM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 3.9 hours before the alert went out and 267 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, Springfield, MO at 00:00Z on 1997-04-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 150 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 1997-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 102 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
150 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
2058 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
102 m²/s²
0-3 km storm-relative helicity
275 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTL 190355 RRA
SVRSTL
MOC019-190445-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1054 PM CDT FRI APR 18 1997
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1145 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN CENTRAL MISSOURI
 
   ...BOONE COUNTY
 
AT 1055 PM CDT A SEVERE THUNDERSTORM WAS NEAR THE BOONE HOWARD
COUNTY LINE JUST SOUTHWEST OF HARRISBURG MOVING SOUTHEAST AT
30 MPH.
 
COLUMBIA IS IN THE PATH OF THIS STORM.
 
HAIL AROUND 1 INCH IN 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, 8:07 PM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson, Saint Louis38 min
Apr 18, 8:42 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Warren33 min
Apr 18, 8:51 PM CDTSevere Thunderstorm WarningLSXLincoln, Pike39 min
Apr 18, 8:58 PM CDTSevere Thunderstorm WarningLSXMarion, Pike, Ralls47 min
Apr 18, 9:00 PM CDTSevere Thunderstorm WarningLSXBoone, Callaway45 min
Apr 18, 9:45 PM CDTSevere Thunderstorm WarningLSXLincoln, Pike45 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 19, 1:11 AM CDTSevere Thunderstorm WarningLSXFranklin34 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.