Alert archive / Illinois / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 225, NWS St. Louis, MO

June 20, 2000Pike County, Illinois; Pike County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 20, 2000, 5:58 PM CDT for Pike County, Illinois; Pike County, Missouri. It was in force for 62 min. 4 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: Jun 20, 2000, 5:58 PM CDT (22:58 UTC)
Expired: Jun 20, 2000, 7:00 PM CDT
In force: 62 min
Issued by: NWS St. Louis, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Pike County, IL, Pike County, MO

The radar

The St Louis radar (KLSX), 97 km from the middle of the area, began a volume at 23:11 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
Jun 20, 6:25 PM CDT	Thunderstorm Wind 52 E	Louisiana, MO	Storm spotters reported trees down in town. One home was damaged by a downed tree.
Jun 20, 6:35 PM CDT	Thunderstorm Wind 52 E	Martinsburg, IL
Jun 20, 6:35 PM CDT	Thunderstorm Wind 52 E	Pittsfield, IL
Jun 20, 6:40 PM CDT	Thunderstorm Wind 52 E	Milton, 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
Jun 20, 5:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.0 hours before the alert went out and 214 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: 135 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1033 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 216 m²/s²
0-3 km storm-relative helicity: 234 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

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

428 
WUUS53 KLSX 202258
SVRSTL
ILC149-MOC163-210000-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
558 PM CDT TUE JUN 20 2000

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 700 PM CDT

* AT 557 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER LOUISIANA...MOVING NORTHEAST AT 25 MPH.

* LOCATIONS IN THE PATH...
  LOUISIANA
  ATLAS
  PLEASANT HILL
  PITTSFIELD
  GRIGGSVILLE
  TIME

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.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

LAT...LON 3951 9125 3935 9113 3954 9058 3979 9066

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 1:16 PM CDT	Severe Thunderstorm Warning	LSX	Montgomery	44 min
Jun 20, 1:47 PM CDT	Tornado Warning	LSX	Fayette, Montgomery	43 min
Jun 20, 2:32 PM CDT	Tornado Warning	LSX	Montgomery	28 min
Jun 20, 2:55 PM CDT	Tornado Warning	LSX	Fayette	50 min
Jun 20, 3:45 PM CDT	Tornado Warning	LSX	Fayette	45 min
Jun 20, 6:13 PM CDT	Tornado Warning	LSX	Pike	47 min
Jun 20, 6:21 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	39 min
Jun 20, 6:37 PM CDT	Severe Thunderstorm Warning	LSX	Audrain	38 min
Jun 20, 6:48 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Shelby	42 min
Jun 20, 6:53 PM CDT	Severe Thunderstorm Warning	LSX	Ralls	52 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2000 Severe Thunderstorm Warnings in Missouri, 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.