Alert archive / Illinois / Tornado Warnings in 2004

Tornado Warning 2, NWS Lincoln, IL

April 20, 2004Marshall County, Illinois

NWS Lincoln, IL issued this tornado warning at Apr 20, 2004, 5:11 PM CDT for Marshall County, Illinois. It was in force for 64 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Apr 20, 2004, 5:11 PM CDT (22:11 UTC)
Expired
Apr 20, 2004, 6:15 PM CDT
In force
64 min
Issued by
NWS Lincoln, IL
Area
Counties, with a storm outline in the text

County Marshall County, IL

What was reported inside it

TimeReportWhereRemark
Apr 20, 5:14 PM CDTTORNADO1 W Camp Grove, ILTORNADO DESTROYED BARN. FROM HENRY COUNTY ESDA.
Apr 20, 5:21 PM CDTTORNADO8 W Henry, ILTORNADO ON THE GROUND.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.2 hours before the alert went out and 99 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, Davenport, at 12:00Z on 2004-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2004-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 square meters per square second.19395878Sfc1 km3 km6 km9 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
1073 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
192 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.

000 
WFUS53 KILX 202211
TORILX
ILC123-202315-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
511 PM CDT TUE APR 20 2004

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* TORNADO WARNING FOR...
  MARSHALL COUNTY IN CENTRAL ILLINOIS

* UNTIL 615 PM CDT

* AT 511 PM CDT...SPOTTERS REPORTED A TORNADO OVER CAMP GROVE...OR
  ABOUT 13 MILES NORTHWEST OF LACON...MOVING NORTHEAST AT 20 MPH.

A TORNADO IS ON THE GROUND. TAKE COVER IMMEDIATELY

REPORT SEVERE WEATHER OR ANY STORM DAMAGE TO YOUR LOCAL ESDA...OR THE
NEAREST LAW ENFORCEMENT AGENCY...FOR RELAY TO THE NATIONAL WEATHER
SERVICE. STAY TUNED FOR LATER STATEMENTS.

LAT...LON 4113 8945 4102 8960 4106 8965 4115 8963
          4115 8941

$$

BAK

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 20, 2:30 PM CDTTornado WarningILXChampaign45 min
Apr 20, 4:42 PM CDTSevere Thunderstorm WarningILXMason63 min
Apr 20, 5:14 PM CDTSevere Thunderstorm WarningILXTazewell61 min
Apr 20, 5:27 PM CDTTornado WarningILXTazewell63 min
Apr 20, 5:49 PM CDTTornado WarningILXKnox, Stark41 min
Apr 20, 5:51 PM CDTTornado WarningILXMarshall9 min
Apr 20, 5:55 PM CDTSevere Thunderstorm WarningILXMcLean35 min
Apr 20, 5:55 PM CDTTornado WarningILXMarshall35 min
Apr 20, 6:05 PM CDTTornado WarningILXWoodford55 min

Nearby

Tornado Warnings in Illinois, 2004Every tornado warning in 2004Tornadoes in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.