Alert archive / Missouri / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 121, NWS St. Louis, MO

May 21, 1998Gasconade County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 21, 1998, 12:28 PM CDT for Gasconade County, Missouri. It was in force for 47 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
May 21, 1998, 12:28 PM CDT (17:28 UTC)
Expired
May 21, 1998, 1:15 PM CDT
In force
47 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Gasconade County, MO

The radar

The St Louis radar (KLSX), 77 km from the middle of the area, began a volume at 17:28 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
May 21, 11:30 AM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 5.5 hours before the alert went out and 265 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 1998-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2242 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 1998-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 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
2242 J/kg
Mixed-layer CIN
-143 J/kg
Mixed-layer LCL
1149 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
86 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.8

Open this sounding in Storm Lab

The text

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

510 
WUUS1 KSTL 211730 RRA
SVRSTL
MOC073-211815-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1228 PM CDT THU MAY 21 1998

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GASCONADE COUNTY IN EASTERN MISSOURI

* UNTIL 115 PM CDT

* AT 1228 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM 5 MILES EAST OF CHAMOIS OR 15 MILES WEST OF
  HERMANN... MOVING SOUTHEAST AT 40 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  MT STERLING
  DRAKE
  OWENSVILLE


THE PRIMARY SEVERE WEATHER THREAT IS DAMAGING HAIL. LARGE HAIL CAN
CAUSE EXTENSIVE PROPERTY DAMAGE AN SERIOUS INJURY TO PEOPLE CAUGHT
OUTDOORS. MOVE INSIDE A STURDY BUILDING IMMEDIATELY.

JPK/GS

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, May 21, 11:24 AM CDT, 1 hour 4 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>075-084-085-099-212300-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
1124 AM CDT THU MAY 21 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.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE ENTIRE
COUNTY WARNING AREA THE REMAINDER OF TODAY AND TONIGHT.

SEVERE THUNDERSTORM WATCH 384 REMAINS IN EFFECT UNTIL 100 PM
FOR MUCH OF CENTRAL MISSOURI AND PORTIONS OF NORTHEAST MISSOURI.

SEVERE THUNDERSTORM WATCH 386 IS IN EFFECT UNTIL 500 PM FOR
MUCH OF EASTERN MISSOURI AND SOUTHWEST ILLINOIS.
SKYWARN ACTIVATION AND SPOTTER ACTION IS NEEDED IN THE WATCH AREAS
AND MAY BE REQUIRED IN ADDITIONAL AREAS THIS AFTERNOON AND TONIGHT.

GLASS
Special weather statement, May 21, 11:24 AM CDT, 1 hour 4 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>075-084-085-099-212300-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
1124 AM CDT THU MAY 21 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.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE ENTIRE
COUNTY WARNING AREA THE REMAINDER OF TODAY AND TONIGHT.

SEVERE THUNDERSTORM WATCH 384 REMAINS IN EFFECT UNTIL 100 PM
FOR MUCH OF CENTRAL MISSOURI AND PORTIONS OF NORTHEAST MISSOURI.

SEVERE THUNDERSTORM WATCH 386 IS IN EFFECT UNTIL 500 PM FOR
MUCH OF EASTERN MISSOURI AND SOUTHWEST ILLINOIS.
SKYWARN ACTIVATION AND SPOTTER ACTION IS NEEDED IN THE WATCH AREAS
AND MAY BE REQUIRED IN ADDITIONAL AREAS THIS AFTERNOON AND TONIGHT.

GLASS

The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 10:16 AM CDTSevere Thunderstorm WarningLSXShelby49 min
May 21, 10:58 AM CDTSevere Thunderstorm WarningLSXAudrain, Monroe47 min
May 21, 11:29 AM CDTSevere Thunderstorm WarningLSXPike46 min
May 21, 11:41 AM CDTSevere Thunderstorm WarningLSXCallaway, Montgomery44 min
May 21, 12:05 PM CDTSevere Thunderstorm WarningLSXCallaway35 min
May 21, 12:13 PM CDTSevere Thunderstorm WarningLSXOsage32 min
May 21, 12:25 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Warren50 min
May 21, 12:53 PM CDTSevere Thunderstorm WarningLSXSaint Louis47 min
May 21, 12:57 PM CDTSevere Thunderstorm WarningLSXFranklin48 min
May 21, 1:06 PM CDTSevere Thunderstorm WarningLSXCity of Saint Louis44 min
May 21, 1:44 PM CDTSevere Thunderstorm WarningLSXJefferson46 min
May 21, 1:54 PM CDTSevere Thunderstorm WarningLSXWashington46 min
May 21, 2:28 PM CDTSevere Thunderstorm WarningLSXIron, Madison, Saint Francois52 min
May 21, 3:20 PM CDTSevere Thunderstorm WarningLSXIron, Madison45 min
May 21, 6:30 PM CDTFlash Flood WarningLSXIron, Madison5 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.