Alert archive / Illinois / Tornado Warnings in 1999
Tornado Warning 2, NWS Chicago, IL
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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 4, 4:30 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 4, 6:15 PM CDT | Severe Thunderstorm Watch | SPC | 5 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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 4, 4:10 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle, Livingston | 50 min |
| Jun 4, 5:00 PM CDT | Severe Thunderstorm Warning | LOT | Livingston | 45 min |
| Jun 4, 5:50 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Livingston | 30 min |
| Jun 4, 5:50 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 30 min |
| Jun 4, 6:27 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 33 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.