Alert archive / Illinois / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 427, NWS St. Louis, MO

August 23, 2000Macoupin County, Montgomery County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 23, 2000, 10:19 PM CDT for Macoupin County, Montgomery County, Illinois. It was in force for 56 min. No storm report in the archive falls 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.

The facts

Issued
Aug 23, 2000, 10:19 PM CDT (03:19 UTC)
Expired
Aug 23, 2000, 11:15 PM CDT
In force
56 min
Issued by
NWS St. Louis, MO
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Macoupin County, IL, Montgomery County, IL

The watch it was issued in

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

IssuedProductOfficeLasted
Aug 23, 9:45 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 3.3 hours before the alert went out and 130 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 2000-08-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1082 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2000-08-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 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
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 240320
SVRSTL
ILC117-135-240415-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1019 PM CDT WED AUG 23 2000

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MACOUPIN COUNTY IN CENTRAL ILLINOIS
  MONTGOMERY COUNTY IN CENTRAL ILLINOIS

* UNTIL 1115 PM CDT

* AT 1019 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 8 MILES NORTH OF PALMYRA...MOVING SOUTHEAST AT
  25 MPH.

* LOCATIONS IN THE PATH...
  PALMYRA
  VIRDEN
  GIRARD
  RAYMOND
  WAGGONER
  LITCHFIELD

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME
OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE WATER COVERS THE ROAD.

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 3952 8979 3952 9010 3914 8972 3930 8947

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 23, 8:25 PM CDTSevere Thunderstorm WarningLSXMacoupin, Montgomery50 min
Aug 23, 8:44 PM CDTTornado WarningLSXMontgomery46 min
Aug 23, 9:29 PM CDTTornado WarningLSXMontgomery31 min
Aug 23, 9:43 PM CDTSevere Thunderstorm WarningLSXBond, Fayette62 min
Aug 23, 10:58 PM CDTSevere Thunderstorm WarningLSXMadison47 min
Aug 23, 11:16 PM CDTSevere Thunderstorm WarningLSXBond, Montgomery59 min
Aug 23, 11:21 PM CDTSevere Thunderstorm WarningLSXCalhoun54 min
Aug 23, 11:28 PM CDTSevere Thunderstorm WarningLSXMacoupin62 min
Aug 23, 11:51 PM CDTSevere Thunderstorm WarningLSXJersey39 min
Aug 24, 12:09 AM CDTSevere Thunderstorm WarningLSXFayette, Marion66 min
Aug 24, 12:11 AM CDTSevere Thunderstorm WarningLSXMonroe, Saint Clair49 min
Aug 24, 12:27 AM CDTFlash Flood WarningLSXBond, Fayette, Macoupin, Marion, Montgomery6 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 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; the sounding from the Mesonet's radiosonde archive.