Alert archive / Illinois / Tornado Warnings in 2004

Tornado Warning 36, NWS Chicago, IL

May 30, 2004Iroquois County, Illinois

NWS Chicago, IL issued this tornado warning at May 30, 2004, 4:38 PM CDT for Iroquois County, Illinois. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 30, 2004, 4:38 PM CDT (21:38 UTC)
Expired: May 30, 2004, 5:30 PM CDT
In force: 52 min
Issued by: NWS Chicago, IL
Area: Counties, with a storm outline in the text

County Iroquois County, IL

The radar

The Chicago radar (KLOT), 81 km from the middle of the area, began a volume at 21:42 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.

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 30, 4:25 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.6 hours before the alert went out and 96 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: 1629 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 8.9

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KLOT 302138
TORLOT
ILC075-302230-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHICAGO IL
437 PM CDT SUN MAY 30 2004

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* TORNADO WARNING FOR...
  IROQUOIS COUNTY IN EAST CENTRAL ILLINOIS

* UNTIL 530 PM CDT

* AT 437 PM CDT...DOPPLER RADAR INDICATED STRONG ROTATION IN A SEVERE
  THUNDERSTORM NEAR 6 MILES WEST OF THAWVILLE...MOVING NORTHEAST AT
  20 MPH.

* THE STORM WILL BE NEAR...
  ONARGA AROUND 455 PM CDT.
  GILMAN AROUND 505 PM CDT.
  ASHKUM AROUND 525 PM CDT.
  CLIFTON AROUND 530 PM CDT.

DO NOT WAIT UNTIL YOU HEAR OR SEE THE TORNADO. TAKE SHELTER NOW.

LAT...LON 4093 8814 4060 8812 4084 8768 4096 8784
          4101 8808
$$

MARSILI

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 9:10 AM CDT	Severe Thunderstorm Warning	LOT	Lee	50 min
May 30, 9:22 AM CDT	Severe Thunderstorm Warning	LOT	LaSalle	38 min
May 30, 10:00 AM CDT	Severe Thunderstorm Warning	LOT	Grundy, Kendall, LaSalle	60 min
May 30, 10:34 AM CDT	Tornado Warning	LOT	Livingston	26 min
May 30, 10:54 AM CDT	Flash Flood Warning	LOT	Cook	3 hr
May 30, 11:02 AM CDT	Severe Thunderstorm Warning	LOT	Grundy, Kendall, Will	58 min
May 30, 11:25 AM CDT	Tornado Warning	LOT	Livingston	50 min
May 30, 11:46 AM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Kankakee	59 min
May 30, 4:14 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Livingston	61 min
May 30, 4:25 PM CDT	Tornado Warning	LOT	Ford, Livingston	50 min
May 30, 5:23 PM CDT	Tornado Warning	LOT	Livingston	67 min
May 30, 5:25 PM CDT	Tornado Warning	LOT	Iroquois	50 min
May 30, 5:46 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle, Lee	59 min
May 30, 5:48 PM CDT	Special Marine Warning	LOT		3 hr
May 30, 5:48 PM CDT	Special Marine Warning	LOT		3 hr
May 30, 5:48 PM CDT	Special Marine Warning	LOT		3 hr
May 30, 6:11 PM CDT	Tornado Warning	LOT	LaSalle	34 min
May 30, 6:19 PM CDT	Tornado Warning	LOT	Livingston	11 min
May 30, 6:24 PM CDT	Tornado Warning	LOT	Grundy	66 min
May 30, 6:31 PM CDT	Tornado Warning	LOT	Livingston	59 min
May 30, 6:39 PM CDT	Severe Thunderstorm Warning	LOT	Kane, Kendall	51 min
May 30, 6:41 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee, Will	34 min
May 30, 6:48 PM CDT	Severe Thunderstorm Warning	LOT	Ford	42 min
May 30, 6:50 PM CDT	Severe Thunderstorm Warning	LOT	DuPage	40 min

Nearby

Tornado Warnings in Illinois, 2004 Every tornado warning in 2004 Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.