Alert archive / Illinois / Tornado Warnings in 1999
Tornado Warning 3, NWS Chicago, IL
NWS Chicago, IL issued this tornado warning at Jun 12, 1999, 3:46 PM CDT for Iroquois County, Illinois; Benton County, Indiana. It was in force for 30 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 12, 1999, 3:46 PM CDT (20:46 UTC)
- Expired
- Jun 12, 1999, 4:16 PM CDT
- In force
- 30 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
Counties Iroquois County, IL, Benton County, IN
The radar
The Chicago radar (KLOT), 112 km from the middle of the area, began a volume at 20:49 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 nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 8.8 hours before the alert went out and 105 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
- 157 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 927 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KCHI 122053 RRA TORCHI ILC075-INC007-122116- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHICAGO IL 346 PM CDT/EST SAT JUN 12 1999 THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A * TORNADO WARNING FOR... BENTON COUNTY IN NORTHWEST INDIANA IROQUOIS COUNTY IN EAST CENTRAL ILLINOIS * UNTIL 416 PM CDT/EST * AT 345 PM CDT A TORNADO WAS SPOTTED ON THE GROUND JUST SOUTHEAST OF WELLINGTON MOVING NORTHEAST AT 25 MPH. THE FUNNEL HAS MOVED BACK INTO THE STORM BUT HAS THE POTENTIAL FOR REFORMING. * THE STORM WILL MOVE NEAR DAWSON PARK IN IROQUOIS COUNTY AND FREELAND PARK AND EARL PARK IN NORTHWEST BENTON COUNTY. GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST F LOOR! BRUMER
What forecasters said that day
The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Jun 12, 11:38 AM CDT, 4 hours 8 minutes before
ILZ003>006-008-010>014-019>023-032>033-039-INZ001>002- 010>011-019-131100- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL NOON CDT/EST SAT JUN 12 1999 FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA NO RISK OF SEVERE THUNDERSTORMS IS IN EFFECT THIS AFTERNOON OR TONIGHT FOR NORTHERN ILLINOIS AND NORTHWEST INDIANA. WHILE INSTABILITY AND MOISTURE ABOUND FOR PRODUCTION OF THUNDERSTORMS THIS AFTERNOON... WEAK WIND FIELDS DO NOT SUPPORT THE SEVERE POTENTIAL WE EXPERIENCED OVER THE LAST COUPLE OF DAYS. HOWEVER A FLASH FLOOD WATCH REMAINS IN EFFECT FOR THE ENTIRE AREA. ANY THUNDERSTORMS THAT DEVELOP...SEVERE OR NOT...STILL MAINTAIN THE POTENTIAL FOR FLOODING AS WELL AS CAUSING POWER OUTAGES... DAMAGE... AND EVEN DEATH FROM LIGHTNING STRIKES. BRUMER
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 4:21 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee, Will | 41 min |
Nearby
Tornado Warnings in Illinois, 1999Tornado Warnings in Indiana, 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.