Alert archive / Illinois / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 202, NWS St. Louis, MO

October 24, 2001Macoupin County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Oct 24, 2001, 11:40 AM CDT for Macoupin County, Illinois. It was in force for 50 min. 1 report 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: Oct 24, 2001, 11:40 AM CDT (16:40 UTC)
Expired: Oct 24, 2001, 12:30 PM CDT
In force: 50 min
Issued by: NWS St. Louis, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Macoupin County, IL

The radar

The Lincoln radar (KILX), 98 km from the middle of the area, began a volume at 16:43 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

Time	Report	Where	Remark
Oct 24, 11:50 AM CDT	Hail 0.75	Hettick, IL	Macoupin County EMA reported 3/4 inch hail.

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 12:00Z, 4.7 hours before the alert went out and 144 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: 1102 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 597 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 226 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

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

783 
WUUS53 KLSX 241640
SVRSTL
ILC117-241730-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1140 AM CDT WED OCT 24 2001

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 1230 PM CDT

* AT 1140 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER PALMYRA...MOVING NORTHEAST AT 65 MPH.

* LOCATIONS IN THE PATH...
  VIRDEN
  GIRARD

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.

THIS THUNDERSTORM IS CAPABLE OF PRODUCING LARGE HAIL THAT CAN CAUSE
SERIOUS INJURY AND EXTENSIVE PROPERTY DAMAGE. TAKE SHELTER INSIDE OF
A STURDY BUILDING NOW

LAT...LON 3952 9017 3922 9016 3931 8972 3953 8971

RP

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 23, 7:57 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	48 min
Oct 24, 10:44 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun	61 min
Oct 24, 10:44 AM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey	61 min
Oct 24, 11:17 AM CDT	Tornado Warning	LSX	Greene	43 min
Oct 24, 12:14 PM CDT	Severe Thunderstorm Warning	LSX	Jersey	61 min
Oct 24, 12:52 PM CDT	Severe Thunderstorm Warning	LSX	Madison	53 min
Oct 24, 1:00 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	45 min
Oct 24, 1:05 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	40 min
Oct 24, 1:33 PM CDT	Severe Thunderstorm Warning	LSX	Bond	42 min
Oct 24, 1:48 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	42 min
Oct 24, 1:54 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	51 min
Oct 24, 2:31 PM CDT	Tornado Warning	LSX	Randolph	29 min
Oct 24, 2:41 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	49 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.