Alert archive / Illinois / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 33, NWS St. Louis, MO

April 9, 2001Monroe County, Saint Clair County, Illinois; Jefferson County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 9, 2001, 10:06 PM CDT for Monroe County, Saint Clair County, Illinois; Jefferson County, Missouri. It was in force for 39 min. 2 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
Apr 9, 2001, 10:06 PM CDT (03:06 UTC)
Expired
Apr 9, 2001, 10:45 PM CDT
In force
39 min
Issued by
NWS St. Louis, MO
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Monroe County, IL, Saint Clair County, IL, Jefferson County, MO

The radar

The St Louis radar (KLSX), 48 km from the middle of the area, began a volume at 03:05 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Apr 9, 10:42 PM CDTHail 0.75De Soto, MO
Apr 9, 10:45 PM CDTHail 0.75Festus, MO

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, 3.1 hours before the alert went out and 223 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 2001-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1891 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 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 2001-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 square meters per square second.1939587897Sfc1 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
1891 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
2017 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.6

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLSX 100308
SVRSTL
ILC119-133-163-MOC099-100345-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1006 PM CDT MON APR 9 2001

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JEFFERSON COUNTY IN EAST CENTRAL MISSOURI
  MADISON COUNTY IN SOUTHWEST ILLINOIS
  MONROE COUNTY IN SOUTHWEST ILLINOIS
  ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 1045 PM CDT

* AT 1006 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 9 MILES NORTHWEST OF GRANITE CITY
  TO KIRKWOOD TO NEAR CEDAR HILL...MOVING SOUTHEAST AT 35 MPH.

* LOCATIONS IN THE PATH...
  EAST CARONDELET
  VENICE
  ANTONIA
  ARNOLD
  GRANITE CITY
  CAHOKIA
  DUPO
  MADISON
  COLUMBIA
  EAST ST. LOUIS

THESE STORMS HAVE A HISTORY OF LARGE HAIL AND SPORADIC WIND DAMAGE.

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.

THE PRIMARY THREAT POSED BY THIS STORM IS DAMAGING WINDS. MOVE
QUICKLY TO THE INTERIOR PORTION OF A STURDY SHELTER...AND STAY AWAY
FROM OUTSIDE WALLS AND WINDOWS.

LAT...LON 3892 9009 3848 9028 3821 9078 3807 9047
          3837 8975 3887 8969

GLASS

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 9, 9:59 PM CDTSevere Thunderstorm WarningLSXPike46 min
Apr 9, 10:06 PM CDTSevere Thunderstorm WarningLSXMadison39 min
Apr 9, 10:45 PM CDTSevere Thunderstorm WarningLSXSaint Clair45 min
Apr 9, 10:46 PM CDTSevere Thunderstorm WarningLSXMonroe44 min
Apr 10, 6:11 AM CDTSevere Thunderstorm WarningLSXMacoupin34 min
Apr 10, 11:32 AM CDTSevere Thunderstorm WarningLSXMacoupin, Madison43 min
Apr 10, 12:07 PM CDTSevere Thunderstorm WarningLSXBond, Montgomery38 min
Apr 10, 12:44 PM CDTSevere Thunderstorm WarningLSXFayette46 min
Apr 10, 12:54 PM CDTSevere Thunderstorm WarningLSXClinton, Washington51 min
Apr 9, 8:26 PM CDTSevere Thunderstorm WarningLSXCallaway49 min
Apr 9, 8:35 PM CDTSevere Thunderstorm WarningLSXCole, Osage40 min
Apr 9, 8:44 PM CDTSevere Thunderstorm WarningLSXFranklin46 min
Apr 9, 8:56 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis49 min
Apr 9, 8:59 PM CDTSevere Thunderstorm WarningLSXCrawford, Franklin, Gasconade46 min
Apr 9, 9:19 PM CDTSevere Thunderstorm WarningLSXWarren41 min
Apr 9, 9:29 PM CDTSevere Thunderstorm WarningLSXPike, Ralls46 min
Apr 9, 9:34 PM CDTSevere Thunderstorm WarningLSXCrawford26 min
Apr 9, 9:35 PM CDTSevere Thunderstorm WarningLSXFranklin40 min
Apr 9, 9:43 PM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis47 min
Apr 9, 10:18 PM CDTTornado WarningLSXWashington42 min
Apr 10, 1:18 AM CDTSevere Thunderstorm WarningLSXBoone42 min
Apr 10, 1:55 AM CDTSevere Thunderstorm WarningLSXAudrain50 min
Apr 10, 2:29 AM CDTSevere Thunderstorm WarningLSXPike46 min
Apr 10, 4:24 AM CDTSevere Thunderstorm WarningLSXPike36 min
Apr 10, 6:26 PM CDTTornado WarningLSXBoone, Moniteau64 min
Apr 10, 6:56 PM CDTTornado WarningLSXCallaway64 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2001Severe Thunderstorm Warnings in Missouri, 2001Every severe thunderstorm warning in 2001

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; radar from the NEXRAD Level II archive.