Alert archive / Illinois / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 436, NWS St. Louis, MO

August 23, 2000Calhoun County, Illinois; Saint Charles County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 23, 2000, 11:21 PM CDT for Calhoun County, Illinois; Saint Charles County, Missouri. It was in force for 54 min. 3 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Aug 23, 2000, 11:21 PM CDT (04:21 UTC)
Expired: Aug 24, 2000, 12:15 AM CDT
In force: 54 min
Issued by: NWS St. Louis, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Calhoun County, IL, Saint Charles County, MO

What was reported inside it

Time	Report	Where	Remark
Aug 23, 11:25 PM CDT	Thunderstorm Wind 55 E	Wentzville, MO
Aug 23, 11:33 PM CDT	Thunderstorm Wind 55 E	New Melle, MO
Aug 23, 11:45 PM CDT	Thunderstorm Wind 51 E	Hardin, IL	The Sheriff office reported trees and power lines down.

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 watch it was issued in

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

Issued	Product	Office	Lasted
Aug 23, 9:45 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 4.4 hours before the alert went out and 226 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: 1082 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 1541 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLSX 240425
SVRSTL
ILC013-MOC183-240515-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1121 PM CDT WED AUG 23 2000

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI
  CALHOUN COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 1215 AM CDT

* AT 1121 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 5 MILES SOUTH OF LOUISIANA TO 5
  MILES WEST OF WARRENTON...MOVING SOUTHEAST AT 50 MPH.

* LOCATIONS IN THE PATH...
  WENTZVILLE
  NEW MELLE
  LAKE ST. LOUIS
  DARDENNE PRAIRIE
  ST. PAUL
  COTTLEVILLE
  O'FALLON
  WELDON SPRING
  ST. PETERS
  BELLEVIEW
  ST CHARLES

THIS STORM HAS A HISTORY OF DAMAGING WINDS. TAKE SHELTER IN A STURDY 
BUILDING IMMEDIATELY.  SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES 
WITH LITTLE OR NO ADVANCE WARNING. PREPARE TO MOVE TO A PLACE OF 
SAFETY IN A STURDY STRUCTURE SUCH AS A BASEMENT OR SMALL INTERIOR 
ROOM IF A TORNADO IS SPOTTED.

LAT...LON 3939 9085 3923 9072 3893 9067 3889 9082
          3889 9095 3858 9093 3867 9071 3889 9036
        N  3884 9013 3898 9055 3908 9059 3923 9061
          3939 9062

GKS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 8:25 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	50 min
Aug 23, 8:44 PM CDT	Tornado Warning	LSX	Montgomery	46 min
Aug 23, 9:29 PM CDT	Tornado Warning	LSX	Montgomery	31 min
Aug 23, 9:43 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette	62 min
Aug 23, 10:19 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	56 min
Aug 23, 10:58 PM CDT	Severe Thunderstorm Warning	LSX	Madison	47 min
Aug 23, 11:16 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Montgomery	59 min
Aug 23, 11:28 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	62 min
Aug 23, 11:51 PM CDT	Severe Thunderstorm Warning	LSX	Jersey	39 min
Aug 24, 12:09 AM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	66 min
Aug 24, 12:11 AM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	49 min
Aug 24, 12:27 AM CDT	Flash Flood Warning	LSX	Bond, Fayette, Macoupin, Marion, Montgomery	6 hr
Aug 23, 9:52 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Shelby	38 min
Aug 23, 10:03 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Monroe	42 min
Aug 23, 10:03 PM CDT	Severe Thunderstorm Warning	LSX	Boone	42 min
Aug 23, 10:04 PM CDT	Severe Thunderstorm Warning	LSX	Ralls	41 min
Aug 23, 10:36 PM CDT	Severe Thunderstorm Warning	LSX	Audrain	39 min
Aug 23, 10:40 PM CDT	Severe Thunderstorm Warning	LSX	Pike	50 min
Aug 23, 10:45 PM CDT	Severe Thunderstorm Warning	LSX	Ralls	30 min
Aug 23, 10:46 PM CDT	Severe Thunderstorm Warning	LSX	Montgomery	59 min
Aug 23, 10:58 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	62 min
Aug 23, 11:02 PM CDT	Tornado Warning	LSX	Montgomery	28 min
Aug 23, 11:07 PM CDT	Severe Thunderstorm Warning	LSX	Warren	53 min
Aug 23, 11:40 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	65 min
Aug 23, 11:45 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	45 min
Aug 23, 11:57 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	63 min
Aug 24, 1:36 AM CDT	Flash Flood Warning	LSX	Audrain, Montgomery	5 hr
Aug 24, 2:28 AM CDT	Flash Flood Warning	LSX	Franklin, Warren	5 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2000 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.