Alert archive / Missouri / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 290, NWS St. Louis, MO

June 29, 1998Clark County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 29, 1998, 6:34 PM CDT for Clark 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
Jun 29, 1998, 6:34 PM CDT (23:34 UTC)
Expired
Jun 29, 1998, 7:25 PM CDT
In force
51 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Clark County, MO

The radar

The Quad Cities radar (KDVN), 165 km from the middle of the area, began a volume at 23:34 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 29, 4:15 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.6 hours before the alert went out and 170 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 1998-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 917 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 1998-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 square meters per square second.1939587897117136Sfc1 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
917 J/kg
Mixed-layer CIN
-115 J/kg
Mixed-layer LCL
762 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
11 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.5

Open this sounding in Storm Lab

The text

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

073 
WUUS1 KSTL 292335 RRA
SVRSTL
MOC045-300025-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
634 PM CDT MON JUN 29 1998

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CLARK COUNTY IN NORTHEASTERN MISSOURI

* UNTIL 725 PM CDT

* AT 633 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES KAHOKA MISSOURI... MOVING SOUTHEAST AT
  30 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  ALEXANDRIA
  ST. FRANCISVILLE



THIS STORM HAS A HISTORY OF DAMAGING HAIL. STAY INSIDE AND AWAY
FROM WINDOWS.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

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 29, 3:42 PM CDT, 2 hours 52 minutes before
ILZ064-069-070-074-079-100>102-MOZ061-063>065-292300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
342 PM CDT MON JUN 29 1998

...HEAT ADVISORY FOR PORTIONS OF EAST CENTRAL MISSOURI AND SOUTHWEST
ILLINOIS HAS EXPIRED...

A COLD FRONT ACROSS THE UPPER MIDWEST WILL MOVE SOUTHWARD THROUGH
MISSOURI LATE TONIGHT AND TUESDAY.  YOU CAN EXPECT SHOWERS AND
THUNDERSTORMS WITH THIS FRONT AS IT PASSES THROUGH THE AREA OVER THE
NEXT 24 HOURS.  IN TURN...A RELATIVELY COOLER AND LESS HUMID AIR MASS
WILL SETTLE OVER THE AREA LATE TUESDAY THROUGH WEDNESDAY. THUS...THE
HEAT ADVISORY FOR PORTIONS OF EAST CENTRAL MISSOURI AND SOUTHWEST
ILLINOIS...INCLUDING THE ST LOUIS METROPOLITAN AREA...WILL
BE ALLOWED TO EXPIRE.

METZE
Special weather statement, Jun 29, 3:42 PM CDT, 2 hours 52 minutes before
ILZ064-069-070-074-079-100>102-MOZ061-063>065-292300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
342 PM CDT MON JUN 29 1998

...HEAT ADVISORY FOR PORTIONS OF EAST CENTRAL MISSOURI AND SOUTHWEST
ILLINOIS HAS EXPIRED...

A COLD FRONT ACROSS THE UPPER MIDWEST WILL MOVE SOUTHWARD THROUGH
MISSOURI LATE TONIGHT AND TUESDAY.  YOU CAN EXPECT SHOWERS AND
THUNDERSTORMS WITH THIS FRONT AS IT PASSES THROUGH THE AREA OVER THE
NEXT 24 HOURS.  IN TURN...A RELATIVELY COOLER AND LESS HUMID AIR MASS
WILL SETTLE OVER THE AREA LATE TUESDAY THROUGH WEDNESDAY. THUS...THE
HEAT ADVISORY FOR PORTIONS OF EAST CENTRAL MISSOURI AND SOUTHWEST
ILLINOIS...INCLUDING THE ST LOUIS METROPOLITAN AREA...WILL
BE ALLOWED TO EXPIRE.

METZE

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 28, 7:40 PM CDTSevere Thunderstorm WarningLSXMonroe45 min
Jun 28, 11:40 PM CDTSevere Thunderstorm WarningLSXKnox, Scotland45 min
Jun 29, 12:05 AM CDTFlash Flood WarningLSXLewis4 hr
Jun 29, 5:17 AM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles, Warren48 min
Jun 29, 5:34 AM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis46 min
Jun 29, 3:37 PM CDTSevere Thunderstorm WarningLSXClark48 min
Jun 29, 3:43 PM CDTSevere Thunderstorm WarningLSXScotland47 min
Jun 29, 4:11 PM CDTFlash Flood WarningLSXClark, Scotland3 hr
Jun 29, 4:30 PM CDTSevere Thunderstorm WarningLSXClark, Knox, Lewis, Scotland65 min
Jun 29, 4:51 PM CDTFlash Flood WarningLSXLewis3 hr

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.