Alert archive / Illinois / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 397, NWS St. Louis, MO

August 17, 2000Fayette County, Montgomery County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 17, 2000, 8:28 PM CDT for Fayette County, Montgomery County, Illinois. It was in force for 47 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: Aug 17, 2000, 8:28 PM CDT (01:28 UTC)
Expired: Aug 17, 2000, 9:15 PM CDT
In force: 47 min
Issued by: NWS St. Louis, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Fayette County, IL, Montgomery County, IL

The radar

The Lincoln radar (KILX), 104 km from the middle of the area, began a volume at 01:30 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
Aug 17, 8:40 PM CDT	Thunderstorm Wind	Lakewood, IL	Trees and power lines were blown down in both Lakewood and Stewardson.

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, 1.5 hours before the alert went out and 116 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.

146 
WUUS53 KLSX 180130
SVRSTL
ILC051-135-180215-

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN MONTGOMERY COUNTY IN CENTRAL ILLINOIS
  NORTHERN FAYETTE COUNTY IN SOUTH CENTRAL ILLINOIS

* UNTIL 915 PM CDT

* AT 828 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A LINE OF SEVERE SEVERE THUNDERSTORMS FROM NOKOMIS TO NEAR
  HILLSBORO...MOVING EAST AT 30 MPH.

* LOCATIONS IN THE PATH...
  RAMSEY
  WRIGHTS CORNER
  FILMORE

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 3930 8948 3912 8949 3907 8883 3932 8882

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, 8:29 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, 9:50 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	40 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; radar from the NEXRAD Level II archive.