Alert archive / Missouri / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 81, NWS St. Louis, MO

May 16, 1999Washington County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 16, 1999, 12:08 PM CDT for Washington County, Missouri. It was in force for 52 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 16, 1999, 12:08 PM CDT (17:08 UTC)
Expired
May 16, 1999, 1:00 PM CDT
In force
52 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Washington County, MO

The radar

The St Louis radar (KLSX), 84 km from the middle of the area, began a volume at 17:11 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, 5.1 hours before the alert went out and 284 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 1999-05-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1981 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 1999-05-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 384 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
1981 J/kg
Mixed-layer CIN
-219 J/kg
Mixed-layer LCL
888 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
384 m²/s²
0-3 km storm-relative helicity
364 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.

999 
WUUS1 KSTL 161710 RRA
SVRSTL
MOC221-161800-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1208 PM CDT SUN MAY 16 1999

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WASHINGTON COUNTY IN EAST CENTRAL MISSOURI

* UNTIL 100 PM CDT

THIS REPLACES AND EXTENDS THE EARLIER WARNING FOR WASHINGTON COUNTY

* AT 1203 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A LINE OF SEVERE THUNDERSTORMS FROM 17 MILES NORTHWEST OF POTOSI
  TO 15 MILES SOUTH OF POTOSI... MOVING EAST AT 25 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  POTOSI
  OLD MINES
  OTHER COMMUNITIES ALONG AND NEAR HIGHWAY 21

3/4 INCH DIAMETER HAIL WAS REPORTED NEAR BELGRADE AT 1142 AM
BY FIRE DEPARTMENT OFFICIALS

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.

JP


&

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 16, 7:05 AM CDT, 5 hours 3 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>075-084-085-099-161630-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
705 AM CDT SUN MAY 16 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 TODAY AND TONIGHT
ACROSS PORTIONS OF CENTRAL AND NORTHEAST MISSOURI AS WELL AS A LARGE
PORTION OF WEST CENTRAL ILLINOIS.  THE SLIGHT RISK AREA IS GENERALLY
ALONG AND NORTH OF A SEDALIA...COLUMBIA...VANDALIA...PITTSFIELD
LINE.

THE MAIN SEVERE WEATHER THREAT IS DAMAGING WINDS AND LARGE HAIL.

EMERGENCY MANAGERS AND STORM SPOTTERS SHOULD REMAIN ALERT FOR
POSSIBLE SKYWARN ACTIVATION.

GLASS
Special weather statement, May 16, 7:05 AM CDT, 5 hours 3 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>075-084-085-099-161630-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
705 AM CDT SUN MAY 16 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 TODAY AND TONIGHT
ACROSS PORTIONS OF CENTRAL AND NORTHEAST MISSOURI AS WELL AS A LARGE
PORTION OF WEST CENTRAL ILLINOIS.  THE SLIGHT RISK AREA IS GENERALLY
ALONG AND NORTH OF A SEDALIA...COLUMBIA...VANDALIA...PITTSFIELD
LINE.

THE MAIN SEVERE WEATHER THREAT IS DAMAGING WINDS AND LARGE HAIL.

EMERGENCY MANAGERS AND STORM SPOTTERS SHOULD REMAIN ALERT FOR
POSSIBLE SKYWARN ACTIVATION.

GLASS

The office that day

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

IssuedProductOfficeCountiesLasted
May 16, 11:11 AM CDTSevere Thunderstorm WarningLSXCrawford, Washington64 min
May 16, 11:21 AM CDTSevere Thunderstorm WarningLSXIron, Reynolds64 min
May 16, 4:59 PM CDTSevere Thunderstorm WarningLSXMarion61 min

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.