Alert archive / Illinois / Tornado Warnings in 1999

Tornado Warning 2, NWS Chicago, IL

June 4, 1999Ford County, Iroquois County, Illinois

NWS Chicago, IL issued this tornado warning at Jun 4, 1999, 6:16 PM CDT for Ford County, Iroquois County, Illinois. It was in force for 14 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 4, 1999, 6:16 PM CDT (23:16 UTC)
Expired
Jun 4, 1999, 6:30 PM CDT
In force
14 min
Issued by
NWS Chicago, IL
Area
Whole counties

Counties Ford County, IL, Iroquois County, IL

The radar

The Chicago radar (KLOT), 104 km from the middle of the area, began a volume at 23:20 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
Jun 4, 4:30 PM CDTSevere Thunderstorm WatchSPC3 hr
Jun 4, 6:15 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.3 hours before the alert went out and 76 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 1999-06-04Temperature 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, Lincoln, IL at 12:00Z on 1999-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 square meters per square second.1939Sfc1 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
1578 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
186 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KCHI 042315 RRA
TORCHI
ILC053-075-042330-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHICAGO IL
616 PM CDT FRI JUN 4 1999

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* TORNADO WARTNING FOR...
  SOUTHERN FORD COUNTY IN EAST CENTRAL ILLINOIS
  
* UNTIL 630 PM CDT

* AT 613 PM STATE POLICE REPORTED A TORNADO NEAR ROBERTS MOVING EAST 
   30 MPH

  

A TORNADO IS ON THE GROUND! TAKE SHELTER NOW!

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 4, 4:10 PM CDTSevere Thunderstorm WarningLOTLaSalle, Livingston50 min
Jun 4, 5:00 PM CDTSevere Thunderstorm WarningLOTLivingston45 min
Jun 4, 5:50 PM CDTSevere Thunderstorm WarningLOTFord, Livingston30 min
Jun 4, 5:50 PM CDTSevere Thunderstorm WarningLOTIroquois30 min
Jun 4, 6:27 PM CDTSevere Thunderstorm WarningLOTIroquois33 min

Nearby

Tornado Warnings in Illinois, 1999Every tornado warning in 1999Tornadoes in 1999

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.