Alert archive / Missouri / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 222, NWS St. Louis, MO

June 18, 1998Boone County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 18, 1998, 10:46 AM CDT for Boone County, Missouri. It was in force for 49 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
Jun 18, 1998, 10:46 AM CDT (15:46 UTC)
Expired
Jun 18, 1998, 11:35 AM CDT
In force
49 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 15:47 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

Springfield, MO (KSGF), launched 12:00Z, 3.8 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 12:00Z on 1998-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1617 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, Springfield, MO at 12:00Z on 1998-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 247 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
1617 J/kg
Mixed-layer CIN
-157 J/kg
Mixed-layer LCL
1094 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
247 m²/s²
0-3 km storm-relative helicity
264 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.5

Open this sounding in Storm Lab

The text

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

129 
WUUS1 KSTL 181548 RRA
SVRSTL
MOC019-181635-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1046 AM CDT THU JUN 18 1998

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BOONE COUNTY IN CENTRAL MISSOURI

* UNTIL 1135 AM CDT

* AT AT 1040 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED A SEVERE THUNDERSTORM OVER JAMESTOWN MISSOURI... MOVING
  NORTHEAST AT 35 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  EASLEY AT 1050 AM
  COLUMBIA AT 1055 AM
  BROWNSTATION AT 1100 AM

THE PRIMARY THREAT OF THIS STORM WILL BE DAMAGING WINDS AND LARGE
HAIL.

THIS IS A DANGEROUS STORM BE PREPARED FOR DAMAGING WINDS...HAIL...
AND DEADLY LIGHTNING. STAY INDOORS AWAY FROM WINDOWS.



RP/VA

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jun 18, 6:01 AM CDT, 4 hours 45 minutes before
ILZ058>060-064-065-069-070-074-079-095>102-MOZ009-010-018-019-026-
027-034>036-041-042-047>052-059>065-072>075-084-085-099-181600-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
601 AM CDT THU JUN 18 1998

THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NATIONAL WEATHER
SERVICE FORECAST OFFICE IN ST LOUIS.  AREAS INCLUDED ARE PORTIONS OF
NORTHEAST...CENTRAL...EAST CENTRAL AND SOUTHEAST MISSOURI AS WELL AS
WEST CENTRAL AND SOUTHWEST ILLINOIS.

A COLD FRONT WILL MOVE ACROSS MISSOURI LATE THIS AFTERNOON AND
TONIGHT.  AHEAD OF THIS FRONT...A WARM AND HUMID AIR MASS WILL
HELP FUEL THUNDERSTORM DEVELOPMENT ACROSS THE AREA.

THERE IS A SLIGHT RISK OF SEVERE WEATHER ACROSS THE ENTIRE COUNTY
WARNING AREA WITH THE MAIN THREAT OF SEVERE WEATHER EXPECTED LATE
THIS AFTERNOON AND TONIGHT.

SKYWARN ACTIVATION MAY BE REQUIRED LATER ON TODAY AND TONIGHT.

METZE

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 10:31 AM CDTSevere Thunderstorm WarningLSXMoniteau44 min
Jun 18, 11:19 AM CDTSevere Thunderstorm WarningLSXAudrain46 min
Jun 18, 12:03 PM CDTSevere Thunderstorm WarningLSXKnox47 min
Jun 18, 12:14 PM CDTSevere Thunderstorm WarningLSXScotland51 min
Jun 18, 12:14 PM CDTSevere Thunderstorm WarningLSXShelby51 min
Jun 18, 2:47 PM CDTSevere Thunderstorm WarningLSXCole, Osage48 min
Jun 18, 3:30 PM CDTSevere Thunderstorm WarningLSXMarion50 min
Jun 18, 4:06 PM CDTSevere Thunderstorm WarningLSXKnox, Scotland64 min
Jun 18, 4:33 PM CDTSevere Thunderstorm WarningLSXClark32 min
Jun 18, 4:55 PM CDTSevere Thunderstorm WarningLSXShelby50 min
Jun 18, 5:06 PM CDTSevere Thunderstorm WarningLSXClark34 min
Jun 18, 5:46 PM CDTSevere Thunderstorm WarningLSXBoone34 min
Jun 18, 6:19 PM CDTSevere Thunderstorm WarningLSXMoniteau36 min
Jun 18, 6:25 PM CDTTornado WarningLSXCole, Moniteau35 min
Jun 18, 6:59 PM CDTTornado WarningLSXCole31 min

Nearby

Severe Thunderstorm Warnings in Missouri, 1998Every severe thunderstorm warning in 1998

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.