Alert archive / Illinois / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 21, NWS Lincoln, IL

May 18, 2004Champaign County, Piatt County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at May 18, 2004, 1:43 PM CDT for Champaign County, Piatt County, Illinois. It was in force for 62 min. 3 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: May 18, 2004, 1:43 PM CDT (18:43 UTC)
Expired: May 18, 2004, 2:45 PM CDT
In force: 62 min
Issued by: NWS Lincoln, IL
Area: Counties, with a storm outline in the text

Counties Champaign County, IL, Piatt County, IL

The radar

The Lincoln radar (KILX), 87 km from the middle of the area, began a volume at 18:46 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
May 18, 2:25 PM CDT	HAIL 0.75	Mahomet, IL	REPORTED AT I-74 EXIT 172.
May 18, 2:25 PM CDT	HAIL 0.75	Mahomet, IL	REPORTED AT I-74 EXIT 172.
May 18, 2:25 PM CDT	HAIL 0.75	Mahomet, IL	REPORTED AT I-74 EXIT 172.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 18, 12:00 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 6.7 hours before the alert went out and 25 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: 989 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 838 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

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

738 
WUUS53 KILX 181843
SVRILX
ILC019-147-181945-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
143 PM CDT TUE MAY 18 2004

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  PIATT COUNTY IN CENTRAL ILLINOIS
  CHAMPAIGN COUNTY IN EAST CENTRAL ILLINOIS

* UNTIL 245 PM CDT

* AT 143 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER DE LAND...OR ABOUT 10 MILES NORTH OF
  MONTICELLO...MOVING EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MANSFIELD
  MAHOMET
  LAKE OF THE WOODS
  FISHER
  THOMASBORO
  RANTOUL

ANOTHER LOCATION IN THIS WARNING IS...LODGE.

DUE TO THE SLOW MOVEMENT OF THIS STORM...FLOODING OF STREETS...
UNDERPASSES...AND OTHER LOW AREAS IS POSSIBLE. DO NOT DRIVE OR WALK
THROUGH FLOOD WATERS. MOVE INDOORS AND STAY AWAY FROM WINDOWS.

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 4013 8800 4009 8851 4007 8873 4029 8858
          4039 8806

$$

BARKER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 12:27 PM CDT	Severe Thunderstorm Warning	ILX	Morgan	63 min
May 18, 1:58 PM CDT	Flash Flood Warning	ILX	DeWitt	6 hr
May 18, 3:41 PM CDT	Severe Thunderstorm Warning	ILX	McLean	49 min
May 18, 3:43 PM CDT	Severe Thunderstorm Warning	ILX	McLean	47 min
May 18, 4:43 PM CDT	Severe Thunderstorm Warning	ILX	Peoria, Tazewell, Woodford	62 min
May 18, 4:45 PM CDT	Flash Flood Warning	ILX	Peoria	4 hr
May 18, 4:53 PM CDT	Severe Thunderstorm Warning	ILX	Christian, Shelby	52 min
May 18, 5:08 PM CDT	Tornado Warning	ILX	Tazewell, Woodford	52 min
May 18, 5:35 PM CDT	Tornado Warning	ILX	Tazewell, Woodford	25 min
May 18, 5:40 PM CDT	Severe Thunderstorm Warning	ILX	McLean	65 min
May 18, 6:11 PM CDT	Tornado Warning	ILX	McLean	64 min
May 18, 6:24 PM CDT	Flash Flood Warning	ILX	McLean	3 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2004 Every severe thunderstorm warning 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; radar from the NEXRAD Level II archive.