Alert archive / Missouri / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 233, NWS St. Louis, MO

June 18, 1998Boone County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 18, 1998, 5:46 PM CDT for Boone County, Missouri. It was in force for 34 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, 5:46 PM CDT (22:46 UTC)
Expired
Jun 18, 1998, 6:20 PM CDT
In force
34 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 22:49 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, 4:00 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 10.8 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.

998 
WUUS1 KSTL 182247 RRA
SVRSTL
MOC019-182320-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
546 PM 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 620 PM CDT

* AT 546 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS JUST WEST OF MIDWAY... MOVING
  NORTHEAST AT 50 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  MIDWAY
  COLUMBIA
  HALLSVILLE
  CENTRALIA



THE PRIMARY SEVERE WEATHER THREAT IS DAMAGING WINDS. MOVE QUICKLY
TO A STURDY BUILDING AND STAY AWAY FROM DOORS AND WINDOWS.



GLASS/TRUETT

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, 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, 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.