Alert archive / Illinois / Tornado Warnings in 2021
Tornado Warning 39, NWS Chicago, IL
NWS Chicago, IL issued this tornado warning at Oct 3, 2021, 3:28 PM CDT for Iroquois County, Illinois. It was in force for 17 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Oct 3, 2021, 3:28 PM CDT (20:28 UTC)
- Expired
- Oct 3, 2021, 3:45 PM CDT
- In force
- 17 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Tornado
- Observed
- Hail
- 0.0 in
County Iroquois County, IL
The radar
The Chicago radar (KLOT), 76 km from the middle of the area, began a volume at 20:31 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, 8.5 hours before the alert went out and 97 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
- 819 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 631 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.9
The text
As transmitted.
049
WFUS53 KLOT 032028
TORLOT
ILC075-032045-
/O.NEW.KLOT.TO.W.0039.211003T2028Z-211003T2045Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville
328 PM CDT Sun Oct 3 2021
The National Weather Service in Chicago has issued a
* Tornado Warning for...
Northwestern Iroquois County in east central Illinois...
* Until 345 PM CDT.
* At 328 PM CDT, a confirmed tornado was located near Ashkum, or near
Clifton, moving south at 5 mph.
HAZARD...Damaging tornado.
SOURCE...Weather spotters confirmed tornado.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This tornadic thunderstorm will remain over mainly rural areas of
northwestern Iroquois County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.
&&
LAT...LON 4094 8808 4094 8801 4089 8801 4089 8808
TIME...MOT...LOC 2028Z 359DEG 5KT 4092 8805
TORNADO...OBSERVED
MAX HAIL SIZE...0.00 IN
$$
Birk1 follow-up statement
396
WWUS53 KLOT 032043
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
343 PM CDT Sun Oct 3 2021
ILC075-032053-
/O.EXP.KLOT.TO.W.0039.000000T0000Z-211003T2045Z/
Iroquois IL-
343 PM CDT Sun Oct 3 2021
...THE TORNADO WARNING FOR NORTHWESTERN IROQUOIS COUNTY WILL EXPIRE
AT 345 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.
LAT...LON 4094 8808 4094 8801 4089 8801 4089 8808
TIME...MOT...LOC 2043Z 359DEG 5KT 4090 8805
$$
BirkThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 2, 7:47 PM CDT | Areal Flood Advisory | LOT | Livingston | 4 hr |
| Oct 3, 3:26 PM CDT | Areal Flood Advisory | LOT | Cook, Will | 5 hr |
Nearby
Tornado Warnings in Illinois, 2021Every tornado warning in 2021Tornadoes in 2021
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.