Alert archive / Illinois / Tornado Warnings in 2004

Tornado Warning 39, NWS Chicago, IL

May 30, 2004LaSalle County, Illinois

NWS Chicago, IL issued this tornado warning at May 30, 2004, 6:11 PM CDT for LaSalle County, Illinois. It was in force for 34 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, 6:11 PM CDT (23:11 UTC)
Expired
May 30, 2004, 6:45 PM CDT
In force
34 min
Issued by
NWS Chicago, IL
Area
Counties, with a storm outline in the text

County LaSalle County, IL

The radar

The Chicago radar (KLOT), 73 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.

The watch it was issued in

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

IssuedProductOfficeLasted
May 30, 4:25 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.2 hours before the alert went out and 146 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 12:00Z on 2004-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1629 joules per kilogram.LCLLFCEL10008507005003002001001 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, Lincoln, IL at 12:00Z on 2004-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 201 square meters per square second.193958Sfc1 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
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 302311
TORLOT
ILC099-302345-

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

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* TORNADO WARNING FOR...
  LA SALLE COUNTY IN NORTH CENTRAL ILLINOIS

* UNTIL 645 PM CDT

* AT 609 PM CDT...DOPPLER RADAR INDICATED STRONG ROTATION IN A SEVERE
  THUNDERSTORM NEAR ALONG A LINE EXTENDING FROM 3 MILES NORTHWEST OF
  EARLVILLE TO 3 MILES EAST OF GRAND RIDGE...MOVING EAST AT 25 MPH.

* THE STORM WILL BE NEAR...
  MARSEILLES AROUND 620 PM CDT.
  SHERIDAN AROUND 625 PM CDT.

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING
PREVIOUSLY ISSUED FOR THIS AREA.

DO NOT WAIT UNTIL YOU HEAR OR SEE THE TORNADO. TAKE SHELTER NOW.
REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE.

LAT...LON 4161 8913 4113 8913 4122 8865 4163 8864

$$

PIETRYCHA

The office that day

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

IssuedProductOfficeCountiesLasted
May 30, 9:10 AM CDTSevere Thunderstorm WarningLOTLee50 min
May 30, 9:22 AM CDTSevere Thunderstorm WarningLOTLaSalle38 min
May 30, 10:00 AM CDTSevere Thunderstorm WarningLOTGrundy, Kendall, LaSalle60 min
May 30, 10:34 AM CDTTornado WarningLOTLivingston26 min
May 30, 10:54 AM CDTFlash Flood WarningLOTCook3 hr
May 30, 11:02 AM CDTSevere Thunderstorm WarningLOTGrundy, Kendall, Will58 min
May 30, 11:25 AM CDTTornado WarningLOTLivingston50 min
May 30, 11:46 AM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Kankakee59 min
May 30, 4:14 PM CDTSevere Thunderstorm WarningLOTFord, Livingston61 min
May 30, 4:25 PM CDTTornado WarningLOTFord, Livingston50 min
May 30, 4:38 PM CDTTornado WarningLOTIroquois52 min
May 30, 5:23 PM CDTTornado WarningLOTLivingston67 min
May 30, 5:25 PM CDTTornado WarningLOTIroquois50 min
May 30, 5:46 PM CDTSevere Thunderstorm WarningLOTLaSalle, Lee59 min
May 30, 5:48 PM CDTSpecial Marine WarningLOT3 hr
May 30, 5:48 PM CDTSpecial Marine WarningLOT3 hr
May 30, 5:48 PM CDTSpecial Marine WarningLOT3 hr
May 30, 6:19 PM CDTTornado WarningLOTLivingston11 min
May 30, 6:24 PM CDTTornado WarningLOTGrundy66 min
May 30, 6:31 PM CDTTornado WarningLOTLivingston59 min
May 30, 6:39 PM CDTSevere Thunderstorm WarningLOTKane, Kendall51 min
May 30, 6:41 PM CDTSevere Thunderstorm WarningLOTKankakee, Will34 min
May 30, 6:48 PM CDTSevere Thunderstorm WarningLOTFord42 min
May 30, 6:50 PM CDTSevere Thunderstorm WarningLOTDuPage40 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.