Alert archive / Illinois / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 404, NWS St. Louis, MO

August 17, 2000Madison County, Saint Clair County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 17, 2000, 9:50 PM CDT for Madison County, Saint Clair County, Illinois. It was in force for 40 min. 7 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 17, 2000, 9:50 PM CDT (02:50 UTC)
Expired: Aug 17, 2000, 10:30 PM CDT
In force: 40 min
Issued by: NWS St. Louis, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Madison County, IL, Saint Clair County, IL

What was reported inside it

Time	Report	Where	Remark
Aug 17, 9:50 PM CDT	Thunderstorm Wind 60 E	Trenton, IL
Aug 17, 9:55 PM CDT	Thunderstorm Wind 50 E	(Cps)East Stl Arpt C, IL	ASOS at Parks Bi-State Airport recorded a 58 mph wind gust.
Aug 17, 10:07 PM CDT	Thunderstorm Wind 51 E	Granite City, IL
Aug 17, 10:07 PM CDT	Thunderstorm Wind 51 E	Madison, IL
Aug 17, 10:10 PM CDT	Thunderstorm Wind 55 E	Swansea, IL
Aug 17, 10:15 PM CDT	Thunderstorm Wind 51 E	Collinsville, IL
Aug 17, 10:18 PM CDT	Thunderstorm Wind 55 E	Belleville, IL

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 17, 5:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.8 hours before the alert went out and 200 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: 4438 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1011 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 3.1
Supercell composite: 18.2

Open this sounding in Storm Lab

The text

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

665 
WUUS53 KLSX 180251
SVRSTL
ILC119-163-180330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
950 PM CDT THU AUG 17 2000

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MADISON COUNTY IN SOUTHWEST ILLINOIS
  NORTHERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 1030 PM CDT

* AT 950 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  CLUSTER OF SEVERE THUNDERSTORMS FROM JUST EAST OF FLORISSANT TO 
  DOWNTOWN ST LOUIS...MOVING EAST AT 30 MPH.

* LOCATIONS IN THE PATH...
  BROOKLYN
  EAST ST. LOUIS
  FAIRMONT CITY
  WASHINGTON PARK
  CASEYVILLE
  FAIRVIEW HEIGHTS
  OFALLON
  LEBANON

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.

LAT...LON 3886 9014 3847 9026 3842 8969 3887 8960

TRUETT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 8:04 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	41 min
Aug 17, 8:20 PM CDT	Severe Thunderstorm Warning	LSX	Clinton	40 min
Aug 17, 8:28 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	47 min
Aug 17, 8:29 PM CDT	Severe Thunderstorm Warning	LSX	Madison	46 min
Aug 17, 8:54 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	51 min
Aug 17, 8:58 PM CDT	Severe Thunderstorm Warning	LSX	Bond	47 min
Aug 17, 9:15 PM CDT	Severe Thunderstorm Warning	LSX	Madison	45 min
Aug 17, 9:43 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion	47 min
Aug 17, 10:25 PM CDT	Severe Thunderstorm Warning	LSX	Clinton	50 min
Aug 17, 10:46 PM CDT	Severe Thunderstorm Warning	LSX	Bond	44 min

Nearby

Severe Thunderstorm Warnings in Illinois, 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.