Alert archive / Illinois / Tornado Warnings in 2000
Tornado Warning 21, NWS Chicago, IL
NWS Chicago, IL issued this tornado warning at Sep 11, 2000, 8:25 PM CDT for Ogle County, Illinois. It was in force for 10 min. 3 reports 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
- Sep 11, 2000, 8:25 PM CDT (01:25 UTC)
- Expired
- Sep 11, 2000, 8:35 PM CDT
- In force
- 10 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
County Ogle County, IL
The radar
The Chicago radar (KLOT), 113 km from the middle of the area, began a volume at 01:27 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 |
|---|---|---|---|
| Sep 11, 8:40 PM CDT | Hail 0.75 | Rochelle, IL | |
| Sep 11, 8:45 PM CDT | Thunderstorm Wind 58 E | Oregon, IL | |
| Sep 11, 8:45 PM CDT | Thunderstorm Wind 60 E | Byron, 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 |
|---|---|---|---|
| Sep 11, 7:00 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 1.4 hours before the alert went out and 108 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
- 1371 J/kg
- Mixed-layer CIN
- -112 J/kg
- Mixed-layer LCL
- 2176 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 156 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 WFUS53 KLOT 120126 TORCHI ILC141-120135- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHICAGO IL 825 PM CDT MON SEP 11 2000 THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A * TORNADO WARNING FOR... OGLE COUNTY IN NORTH CENTRAL ILLINOIS * UNTIL 835 PM CDT * AT 825 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH STRONG ROTATION 2 MILES NORTHEAST OF LEAF RIVER...OR ABOUT 7U MILES NORTHEAST OF MOUNT MORRIS...MOVING EAST AT 50 MPH. THIS STORM COULD PRODUCE A TORNADO AT ANY TIME. $$ WILSON NNNN
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 8:07 PM CDT | Severe Thunderstorm Warning | LOT | Ogle, Winnebago | 38 min |
| Sep 11, 8:07 PM CDT | Severe Thunderstorm Warning | LOT | Lee | 38 min |
| Sep 11, 8:57 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Lee, Ogle | 48 min |
| Sep 11, 8:57 PM CDT | Severe Thunderstorm Warning | LOT | Kane, McHenry | 48 min |
| Sep 11, 9:28 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Lake | 47 min |
| Sep 11, 9:58 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall, LaSalle, Will | 62 min |
| Sep 11, 10:50 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Kankakee, Livingston | 55 min |
| Sep 11, 11:44 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Kankakee, Livingston | 61 min |
Nearby
Tornado Warnings in Illinois, 2000Every tornado warning in 2000Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.