Alert archive / Missouri / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 98, NWS St. Louis, MO

April 20, 2000Franklin County, Warren County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 20, 2000, 4:02 AM CDT for Franklin County, Warren County, Missouri. It was in force for 63 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Apr 20, 2000, 4:02 AM CDT (09:02 UTC)
Expired
Apr 20, 2000, 5:05 AM CDT
In force
63 min
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Franklin County, MO, Warren County, MO

What was reported inside it

TimeReportWhereRemark
Apr 20, 4:30 AM CDTThunderstorm Wind 65 ENew Haven, MOThunderstorm wind gusts cause quite a bit of damage in the New Haven area. The roof of a gymnasium at a local school was blown off. Other homes suffered roof damage and numerous trees and power lines were downed.
Apr 20, 4:40 AM CDTThunderstorm Wind 62 EWarrenton, MOThe Sheriff Department reported trees and power lines down throughout town.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 9.0 hours before the alert went out and 278 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, Lincoln, IL at 00:00Z on 2000-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2000-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 334 square meters per square second.193958Sfc1 km3 km6 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1377 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
334 m²/s²
0-3 km storm-relative helicity
489 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.

000 
WUUS53 KLSX 200903
SVRSTL
MOC071-219-221-201005-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
402 AM CDT THU APR 20 2000

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 505 AM CDT

* AT 400 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 10 MILES SOUTHWEST OF MONTGOMERY
  CITY TO SULLIVAN... MOVING NORTHEAST AT 60 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  WARRENTON
  WRIGHT CITY
  WASHINGTON
  ST CLAIR
  POTOSI



THIS STORM HAS A HISTORY OF DAMAGING WINDS. MOVE QUICKLY TO A
STURDY BUILDING AND STAY AWAY FROM DOORS AND WINDOWS.



WDB

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 19, 7:00 PM CDTSevere Thunderstorm WarningLSXPike35 min
Apr 19, 8:01 PM CDTSevere Thunderstorm WarningLSXMontgomery34 min
Apr 19, 8:31 PM CDTSevere Thunderstorm WarningLSXPike19 min
Apr 19, 8:57 PM CDTSevere Thunderstorm WarningLSXPike33 min
Apr 20, 3:21 AM CDTSevere Thunderstorm WarningLSXCole, Osage54 min
Apr 20, 3:38 AM CDTSevere Thunderstorm WarningLSXCrawford, Gasconade52 min
Apr 20, 3:50 AM CDTSevere Thunderstorm WarningLSXIron, Reynolds65 min
Apr 20, 3:53 AM CDTSevere Thunderstorm WarningLSXCallaway, Montgomery47 min
Apr 20, 4:02 AM CDTSevere Thunderstorm WarningLSXWashington63 min
Apr 20, 4:16 AM CDTSevere Thunderstorm WarningLSXLincoln, Pike64 min
Apr 20, 4:20 AM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis50 min
Apr 20, 4:20 AM CDTSevere Thunderstorm WarningLSXSaint Charles50 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2000Every severe thunderstorm warning in 2000

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.