Alert archive / Missouri / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 50, NWS St. Louis, MO

April 3, 1999Crawford County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 3, 1999, 5:12 PM CST for Crawford County, Missouri. It was in force for 48 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
Apr 3, 1999, 5:12 PM CST (23:12 UTC)
Expired
Apr 3, 1999, 6:00 PM CST
In force
48 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Crawford County, MO

The radar

The St Louis radar (KLSX), 97 km from the middle of the area, began a volume at 23:04 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, 11.2 hours before the alert went out and 251 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 1999-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1749 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 1999-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 268 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
1749 J/kg
Mixed-layer CIN
-79 J/kg
Mixed-layer LCL
744 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
268 m²/s²
0-3 km storm-relative helicity
294 m²/s²
Significant tornado parameter
1.4
Supercell composite
6.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTL 032312 RRA
SVRSTL
MOC055-040000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
512 PM CST SAT APR 3 1999

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 600 PM CST

* AT 510 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS 10 MILES SOUTHWEST OF COOKS STATION.
..
  MOVING NORTHEAST AT 40 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  COOKS STATION
  STEELEVILLE
  CUBA
  CHERRYVILLE

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

FG/GK0S

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, Apr 3, 11:25 AM CST, 5 hours 47 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>075-084-085-099-032300-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
1125 AM CST SAT APR 3 1999

THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NWS OFFICE
IN ST. LOUIS. AREAS INCLUDED ARE PARTS OF CENTRAL...NORTHEAST AND
EAST CENTRAL MISSOURI...AND SOUTHWEST ILLINOIS.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE ENTIRE
AREA THIS AFTERNOON AND ESPECIALLY TONIGHT.  SCATTERED THUNDERSTORMS
ARE POSSIBLE ACROSS THE AREA THIS AFTERNOON WHICH COULD PRODUCE LARGE
HAIL AND DAMAGING WINDS...HOWEVER THE MAIN THREAT APPEARS TO BE
TONIGHT. A SQUALL LINE IS EXPECTED TO DEVELOP IN WESTERN MISSOURI
LATE THIS AFTERNOON AND MOVE ACROSS THE AREA TONIGHT BRINGING A
THREAT OF DAMAGING WINDS.

STORM SPOTTER GROUPS AND EMERGENCY MANAGERS SHOULD KEEP ADVISED OF
THE LATEST FORECASTS FOR POSSIBLE SKYWARN ACTION.

GLASS
Special weather statement, Apr 3, 11:25 AM CST, 5 hours 47 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>075-084-085-099-032300-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
1125 AM CST SAT APR 3 1999

THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NWS OFFICE
IN ST. LOUIS. AREAS INCLUDED ARE PARTS OF CENTRAL...NORTHEAST AND
EAST CENTRAL MISSOURI...AND SOUTHWEST ILLINOIS.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE ENTIRE
AREA THIS AFTERNOON AND ESPECIALLY TONIGHT.  SCATTERED THUNDERSTORMS
ARE POSSIBLE ACROSS THE AREA THIS AFTERNOON WHICH COULD PRODUCE LARGE
HAIL AND DAMAGING WINDS...HOWEVER THE MAIN THREAT APPEARS TO BE
TONIGHT. A SQUALL LINE IS EXPECTED TO DEVELOP IN WESTERN MISSOURI
LATE THIS AFTERNOON AND MOVE ACROSS THE AREA TONIGHT BRINGING A
THREAT OF DAMAGING WINDS.

STORM SPOTTER GROUPS AND EMERGENCY MANAGERS SHOULD KEEP ADVISED OF
THE LATEST FORECASTS FOR POSSIBLE SKYWARN ACTION.

GLASS

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 3, 6:42 AM CSTSevere Thunderstorm WarningLSXIron, Reynolds33 min
Apr 3, 8:12 AM CSTSevere Thunderstorm WarningLSXFranklin, Jefferson, Saint Louis48 min
Apr 3, 8:49 AM CSTFlash Flood WarningLSXIron, Madison, Saint Francois3 hr
Apr 3, 8:49 AM CSTFlash Flood WarningLSXSainte Genevieve3 hr
Apr 3, 11:48 AM CSTFlash Flood WarningLSXIron, Madison, Sainte Genevieve, Saint Francois6 hr
Apr 3, 5:57 PM CSTFlash Flood WarningLSXIron, Madison, Reynolds, Saint Francois4 hr

Nearby

Severe Thunderstorm Warnings in Missouri, 1999Every severe thunderstorm warning in 1999

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.