Alert archive / Missouri / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 13, NWS St. Louis, MO

January 21, 1999Madison County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jan 21, 1999, 5:41 PM CST for Madison County, Missouri. It was in force for 49 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: Jan 21, 1999, 5:41 PM CST (23:41 UTC)
Expired: Jan 21, 1999, 6:30 PM CST
In force: 49 min
Issued by: NWS St. Louis, MO
Area: Whole counties

County Madison County, MO

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jan 21, 4:30 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 11.7 hours before the alert went out and 297 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 701 J/kg
Mixed-layer CIN: -198 J/kg
Mixed-layer LCL: 594 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 258 m²/s²
0-3 km storm-relative helicity: 227 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

999 
WUUS1 KSTL 212340 RRA
SVRSTL
MOC123-220030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
541 PM CST THU JAN 21 1999

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN MADISON COUNTY MISSOURI IN SOUTHEASTERN MISSOURI

* UNTIL 630 PM CST

* AT 538 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM IN NORTHERN WAYNE COUNTY...MOVING NORTHEAST
  AT 40 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  BUCKHORN
  MARQUAND
  FREDERICKTOWN


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.

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

GKS/RP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 21, 9:56 AM CST	Severe Thunderstorm Warning	LSX	Osage	49 min
Jan 21, 10:13 AM CST	Severe Thunderstorm Warning	LSX	Gasconade	47 min
Jan 21, 10:39 AM CST	Severe Thunderstorm Warning	LSX	Moniteau	46 min
Jan 21, 11:04 AM CST	Severe Thunderstorm Warning	LSX	Montgomery	46 min
Jan 21, 11:43 AM CST	Severe Thunderstorm Warning	LSX	Lincoln	47 min
Jan 21, 11:45 AM CST	Severe Thunderstorm Warning	LSX	Boone	45 min
Jan 21, 12:01 PM CST	Severe Thunderstorm Warning	LSX	Audrain, Monroe	49 min
Jan 21, 12:51 PM CST	Severe Thunderstorm Warning	LSX	Audrain, Boone	34 min
Jan 21, 1:04 PM CST	Severe Thunderstorm Warning	LSX	Monroe	46 min
Jan 21, 1:11 PM CST	Severe Thunderstorm Warning	LSX	Madison, Saint Francois	49 min

Nearby

Severe Thunderstorm Warnings in Missouri, 1999 Every 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.