Alert archive / Illinois / Tornado Warnings in 2000

Tornado Warning 9, NWS Chicago, IL

May 18, 2000LaSalle County, Illinois

NWS Chicago, IL issued this tornado warning at May 18, 2000, 5:07 PM CDT for LaSalle County, Illinois. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: May 18, 2000, 5:07 PM CDT (22:07 UTC)
Expired: May 18, 2000, 5:30 PM CDT
In force: 23 min
Issued by: NWS Chicago, IL
Area: Whole counties; the outline is the Mesonet’s reconstruction

County LaSalle County, IL

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, 3:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.1 hours before the alert went out and 119 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: 557 J/kg
Mixed-layer CIN: -308 J/kg
Mixed-layer LCL: 1218 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 328 m²/s²
0-3 km storm-relative helicity: 351 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

398 
WFUS53 KLOT 182207
TORCHI
ILC099-182230-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHICAGO IL
507 PM CDT THU MAY 18 2000

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

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

* UNTIL 530 PM CDT

* AT 507 PM CDT...A TRAINED SPOTTER REPORTED A TORNADO AT
  LOSTANT...OR ABOUT 10 MILES SOUTH OF OGLESBY. RADAR SHOWED THIS
  TORNADIC STORM STATIONARY.

* THE TORNADO WILL BE NEAR
  TONICA AROUND 535 PM CDT

THIS IS A DANGEROUS STORM. MOVE INTO YOUR TORNADO SHELTER NOW

LAT...LON 4107 8924 4107 8900 4125 8900 4125 8924

&

KAPLAN

NNNN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 11:41 AM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	34 min
May 18, 11:59 AM CDT	Severe Thunderstorm Warning	LOT	Lake, McHenry	31 min
May 18, 12:05 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Kane, Ogle	25 min
May 18, 12:19 PM CDT	Severe Thunderstorm Warning	LOT	Lake, McHenry	41 min
May 18, 12:19 PM CDT	Severe Thunderstorm Warning	LOT	Boone, Winnebago	41 min
May 18, 12:35 PM CDT	Severe Thunderstorm Warning	LOT	Lee, Ogle	40 min
May 18, 12:58 PM CDT	Severe Thunderstorm Warning	LOT	Boone, Lake, McHenry	62 min
May 18, 2:02 PM CDT	Severe Thunderstorm Warning	LOT	Lake	58 min
May 18, 2:14 PM CDT	Severe Thunderstorm Warning	LOT	Boone, DeKalb, Ogle, Winnebago	61 min
May 18, 2:42 PM CDT	Severe Thunderstorm Warning	LOT	McHenry	48 min
May 18, 2:56 PM CDT	Severe Thunderstorm Warning	LOT	Kane	49 min
May 18, 3:22 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Lake	53 min
May 18, 3:45 PM CDT	Severe Thunderstorm Warning	LOT	Lee	60 min
May 18, 4:23 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle	67 min
May 18, 5:00 PM CDT	Severe Thunderstorm Warning	LOT	Kendall	60 min
May 18, 5:21 PM CDT	Tornado Warning	LOT	Livingston	24 min
May 18, 5:29 PM CDT	Tornado Warning	LOT	Grundy, LaSalle	31 min
May 18, 5:33 PM CDT	Severe Thunderstorm Warning	LOT	Will	57 min
May 18, 5:45 PM CDT	Tornado Warning	LOT	Livingston	30 min
May 18, 5:51 PM CDT	Tornado Warning	LOT	Kankakee, Will	39 min
May 18, 6:01 PM CDT	Tornado Warning	LOT	Ford, Livingston	44 min
May 18, 6:13 PM CDT	Severe Thunderstorm Warning	LOT	Livingston	32 min
May 18, 6:25 PM CDT	Severe Thunderstorm Warning	LOT	Cook	35 min
May 18, 6:33 PM CDT	Tornado Warning	LOT	Ford, Livingston	27 min
May 18, 6:36 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois, Kankakee	39 min
May 18, 6:36 PM CDT	Severe Thunderstorm Warning	LOT	Will	39 min

Nearby

Tornado Warnings in Illinois, 2000 Every tornado warning in 2000 Tornadoes 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; the sounding from the Mesonet's radiosonde archive.