Alert archive / Illinois / Tornado Warnings in 1998
Tornado Warning 13, NWS Chicago, IL
NWS Chicago, IL issued this tornado warning at Aug 24, 1998, 12:52 PM CDT for Boone County, DeKalb County, Illinois. It was in force for 53 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 24, 1998, 12:52 PM CDT (17:52 UTC)
- Expired
- Aug 24, 1998, 1:45 PM CDT
- In force
- 53 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
Counties Boone County, IL, DeKalb County, IL
The radar
The Chicago radar (KLOT), 81 km from the middle of the area, began a volume at 17:52 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 24, 1:07 PM CDT | Thunderstorm Wind 50 | Kirkland, IL |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 24, 10:15 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 5.9 hours before the alert went out and 151 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
- 2161 J/kg
- Mixed-layer CIN
- -158 J/kg
- Mixed-layer LCL
- 1178 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 128 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KCHI 241752 RRA TORCHI ILC007-037-241848- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHICAGO IL 1252 PM CDT MON AUG 24 1998 THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A * TORNADO WARNING FOR... BOONE COUNTY IN NORTH CENTRAL ILLINOIS DE KALB COUNTY IN NORTH CENTRAL ILLINOIS * UNTIL 145 PM CDT * AT 1250 PM...RADAR INDICATED A TORNADO NEAR KISHWAUKEE OR 8 MILES SOUTH OF ROCKFORD...MOVING EAST-SOUTHEAST 45 MPH. * TfOWN IN THE PATH OF THE TORNADO ARE... NEW MILFORD MONROE CENTER IRENE KINGSTON GENOA GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR! JT
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 12:19 PM CDT | Severe Thunderstorm Warning | LOT | Ogle, Winnebago | 51 min |
| Aug 24, 12:37 PM CDT | Tornado Warning | LOT | Ogle, Winnebago | 33 min |
| Aug 24, 12:44 PM CDT | Severe Thunderstorm Warning | LOT | Lee | 55 min |
| Aug 24, 1:14 PM CDT | Severe Thunderstorm Warning | LOT | Kane, McHenry | 31 min |
| Aug 24, 1:28 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kendall, Will | 62 min |
| Aug 24, 1:28 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 62 min |
| Aug 24, 2:09 PM CDT | Severe Thunderstorm Warning | LOT | Will | 51 min |
| Aug 24, 2:26 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee | 54 min |
Nearby
Tornado Warnings in Illinois, 1998Every tornado warning in 1998Tornadoes in 1998
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.