Alert archive / Illinois / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 34, NWS St. Louis, MO

April 9, 2001Madison County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 9, 2001, 10:06 PM CDT for Madison County, Illinois. It was in force for 39 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: 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

County Madison County, IL

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.

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-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: 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.

Issued	Product	Office	Counties	Lasted
Apr 9, 9:59 PM CDT	Severe Thunderstorm Warning	LSX	Pike	46 min
Apr 9, 10:06 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	39 min
Apr 9, 10:45 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	45 min
Apr 9, 10:46 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	44 min
Apr 10, 6:11 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin	34 min
Apr 10, 11:32 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison	43 min
Apr 10, 12:07 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Montgomery	38 min
Apr 10, 12:44 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	46 min
Apr 10, 12:54 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Washington	51 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2001 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.