Alert archive / Missouri / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 228, NWS St. Louis, MO

June 18, 1998Marion County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 18, 1998, 3:30 PM CDT for Marion County, Missouri. It was in force for 50 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, 3:30 PM CDT (20:30 UTC)
Expired
Jun 18, 1998, 4:20 PM CDT
In force
50 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Marion County, MO

The radar

The St Louis radar (KLSX), 147 km from the middle of the area, began a volume at 20:31 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
Jun 18, 12:00 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.5 hours before the alert went out and 223 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 1998-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2000 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, Davenport, at 12:00Z on 1998-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 112 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
2000 J/kg
Mixed-layer CIN
-220 J/kg
Mixed-layer LCL
1205 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
112 m²/s²
0-3 km storm-relative helicity
81 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.

904 
WUUS1 KSTL 182031 RRA
SVRSTL
MOC127-182120-

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MARION COUNTY MISSOURI IN NORTHEASTERN MISSOURI

* UNTIL 420 PM CDT

* AT 330 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 10 MILES WEST SOUTHWEST OF PALMYRA... MOVING
  NORTHEAST AT 40 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  PALMYRA
  RTE 168 BETWEEN PHILADELPHIA AND PALMYRA
  RTE 61 BETWEEN TAYLOR AND PALMYRA



SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND GUSTS IN EXCESS OF 60
MPH...DAMAGING HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. MOVE
TO AN INTERIOR ROOM ON THE LOWEST FLOOR OR YOUR HOME OR BUSINESS.
HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE
WATER COVERS THE ROAD.



GLASS/TRUETT

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, 11:00 AM CDT, 4 hours 30 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>075-084-085-099-191100-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
11 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 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 THIS AFTERNOON AND TONIGHT.

WORK
Special weather statement, Jun 18, 11:00 AM CDT, 4 hours 30 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>075-084-085-099-191100-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
11 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 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 THIS AFTERNOON AND TONIGHT.

WORK

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, 10:46 AM CDTSevere Thunderstorm WarningLSXBoone49 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, 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.