Alert archive / Illinois / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 104, NWS St. Louis, MO

April 20, 2000Greene County, Jersey County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 20, 2000, 4:49 AM CDT for Greene County, Jersey County, Illinois. It was in force for 46 min. 5 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Apr 20, 2000, 4:49 AM CDT (09:49 UTC)
Expired
Apr 20, 2000, 5:35 AM CDT
In force
46 min
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Greene County, IL, Jersey County, IL

What was reported inside it

TimeReportWhereRemark
Apr 20, 5:05 AM CDTThunderstorm Wind 60 EJerseyville, IL
Apr 20, 5:10 AM CDTThunderstorm Wind 60 ERosedale, IL
Apr 20, 5:10 AM CDTThunderstorm Wind 60 EEldred, IL
Apr 20, 5:15 AM CDTThunderstorm Wind 60 ECarrollton, IL
Apr 20, 5:20 AM CDTThunderstorm Wind 60 EGreenfield, 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.

IssuedProductOfficeLasted
Apr 20, 4:15 AM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 9.8 hours before the alert went out and 184 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2000-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2000-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 334 square meters per square second.193958Sfc1 km3 km6 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1377 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
334 m²/s²
0-3 km storm-relative helicity
489 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

095 
WUUS53 KLSX 200949
SVRSTL
ILC061-083-201035-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
449 AM CDT THU APR 20 2000

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GREENE COUNTY IN SOUTHWESTERN ILLINOIS
  JERSEY COUNTY IN SOUTHWESTERN ILLINOIS

* UNTIL 535 AM CDT

* AT 446 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM PITTSFIELD ILLINOIS TO ST
  CHARLES MISSOURI... MOVING NORTHEAST AT 60 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  ROODHOUSE
  WHITE HALL
  CARROLLTON
  JERSEYVILLE
  GRAFTON



THIS STORM HAS A HISTORY OF DAMAGING WINDS. MOVE QUICKLY TO A
STURDY BUILDING AND STAY AWAY FROM DOORS AND WINDOWS.



WDB

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 19, 8:47 PM CDTSevere Thunderstorm WarningLSXPike33 min
Apr 19, 8:57 PM CDTSevere Thunderstorm WarningLSXCalhoun33 min
Apr 20, 3:46 AM CDTSevere Thunderstorm WarningLSXAdams49 min
Apr 20, 4:29 AM CDTSevere Thunderstorm WarningLSXCalhoun, Pike51 min
Apr 20, 5:06 AM CDTSevere Thunderstorm WarningLSXMacoupin49 min
Apr 20, 7:18 AM CDTSevere Thunderstorm WarningLSXJersey42 min
Apr 20, 7:29 AM CDTSevere Thunderstorm WarningLSXGreene46 min
Apr 20, 8:02 AM CDTTornado WarningLSXMacoupin43 min
Apr 20, 8:54 AM CDTSevere Thunderstorm WarningLSXMontgomery51 min
Apr 20, 9:37 AM CDTSevere Thunderstorm WarningLSXBond, Clinton, Fayette48 min
Apr 20, 10:27 AM CDTSevere Thunderstorm WarningLSXFayette48 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2000Every 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.