Alert archive / Illinois / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 451, NWS St. Louis, MO

September 11, 2000Pike County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Sep 11, 2000, 9:32 PM CDT for Pike County, Illinois. It was in force for 58 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: Sep 11, 2000, 9:32 PM CDT (02:32 UTC)
Expired: Sep 11, 2000, 10:30 PM CDT
In force: 58 min
Issued by: NWS St. Louis, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Pike County, IL

The radar

The St Louis radar (KLSX), 103 km from the middle of the area, began a volume at 02:35 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
Sep 11, 9:45 PM CDT	Thunderstorm Wind 56 E	Barry, IL	The Sheriff's office reported power lines down in Barry.

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
Sep 11, 8:00 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.5 hours before the alert went out and 244 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: 3019 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1421 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.6

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLSX 120233
SVRSTL
ILC149-MOC007-163-173-120330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
932 PM CDT MON SEP 11 2000

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  AUDRAIN COUNTY IN CENTRAL MISSOURI
  PIKE COUNTY IN NORTHEAST MISSOURI
  RALLS COUNTY IN NORTHEAST MISSOURI
  PIKE COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 1030 PM CDT

* AT 932 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 9 MILES SOUTHWEST OF BARRY ILLINOIS
  TO 14 MILES SOUTHWEST OF MISSOURI LADDONIA...MOVING EAST AT 20 MPH.

* LOCATIONS IN THE PATH...
  VANDALIA
  CURRYVILLE
  BARRY
  BOWLING GREEN
  LOUISIANA
  ATLAS
  PIKE
  NEW HARTFORD

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 3969 9137 3906 9194 3915 9125 3981 9065

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 11, 9:10 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	65 min
Sep 11, 10:09 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	66 min
Sep 11, 10:32 PM CDT	Severe Thunderstorm Warning	LSX	Greene	58 min
Sep 11, 10:51 PM CDT	Severe Thunderstorm Warning	LSX	Jersey	39 min
Sep 11, 10:53 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	52 min
Sep 11, 11:16 PM CDT	Severe Thunderstorm Warning	LSX	Madison	59 min
Sep 12, 12:01 AM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	59 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.