Alert archive / Missouri / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 101, NWS St. Louis, MO

April 20, 2000Saint Louis County, City of Saint Louis, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 20, 2000, 4:20 AM CDT for Saint Louis County, City of Saint Louis, Missouri. It was in force for 50 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 20, 2000, 4:20 AM CDT (09:20 UTC)
Expired: Apr 20, 2000, 5:10 AM CDT
In force: 50 min
Issued by: NWS St. Louis, MO
Area: Whole counties

Counties City of Saint Louis, MO, Saint Louis 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
Apr 20, 4:15 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 9.3 hours before the alert went out and 224 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: 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 200920
SVRSTL
MOC183-189-510-201010-

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI
  ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI
  ST. LOUIS CITY IN EAST CENTRAL MISSOURI

* UNTIL 510 AM CDT

* AT 418 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM WARRENTON TO ST CLAIR... MOVING
  NORTHEAST AT 60 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  ST LOUIS CITY
  MANCHESTER
  ST PETERS
  ST CHARLES
  FLORRISSANT

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

MB/RP

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 7:00 PM CDT	Severe Thunderstorm Warning	LSX	Pike	35 min
Apr 19, 8:01 PM CDT	Severe Thunderstorm Warning	LSX	Montgomery	34 min
Apr 19, 8:31 PM CDT	Severe Thunderstorm Warning	LSX	Pike	19 min
Apr 19, 8:57 PM CDT	Severe Thunderstorm Warning	LSX	Pike	33 min
Apr 20, 3:21 AM CDT	Severe Thunderstorm Warning	LSX	Cole, Osage	54 min
Apr 20, 3:38 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Gasconade	52 min
Apr 20, 3:50 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	65 min
Apr 20, 3:53 AM CDT	Severe Thunderstorm Warning	LSX	Callaway, Montgomery	47 min
Apr 20, 4:02 AM CDT	Severe Thunderstorm Warning	LSX	Franklin, Warren	63 min
Apr 20, 4:02 AM CDT	Severe Thunderstorm Warning	LSX	Washington	63 min
Apr 20, 4:16 AM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Pike	64 min
Apr 20, 4:20 AM CDT	Severe Thunderstorm Warning	LSX	Saint Charles	50 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2000 Every 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; the sounding from the Mesonet's radiosonde archive.