Alert archive / Illinois / Tornado Warnings in 2021
Tornado Warning 36, NWS Chicago, IL
NWS Chicago, IL issued this tornado warning at Aug 9, 2021, 9:30 PM CDT for Kankakee County, Will County, Illinois. It was in force for 45 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
- Aug 9, 2021, 9:30 PM CDT (02:30 UTC)
- Expired
- Aug 9, 2021, 10:15 PM CDT
- In force
- 45 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Kankakee County, IL, Will County, IL
The radar
The Chicago radar (KLOT), 35 km from the middle of the area, began a volume at 02:30 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 |
|---|---|---|---|
| Aug 9, 2:43 PM CDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 2.5 hours before the alert went out and 134 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
- 4598 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 775 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 179 m²/s²
- 0-3 km storm-relative helicity
- 284 m²/s²
- Significant tornado parameter
- 3.9
- Supercell composite
- 24.2
The text
As transmitted.
138
WFUS53 KLOT 100230
TORLOT
ILC091-197-100315-
/O.NEW.KLOT.TO.W.0036.210810T0230Z-210810T0315Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville
930 PM CDT Mon Aug 9 2021
The National Weather Service in Chicago has issued a
* Tornado Warning for...
Southwestern Will County in northeastern Illinois...
North central Kankakee County in northeastern Illinois...
* Until 1015 PM CDT.
* At 930 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Wilmington, moving east at 20 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
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
southwestern Will and north central Kankakee Counties, including
the following locations... Symerton and Wilton Center.
Including the following interstate...
I-55 between mile markers 237 and 240.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 4123 8822 4134 8823 4142 8789 4122 8790
TIME...MOT...LOC 0230Z 261DEG 17KT 4128 8817
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Carlaw3 follow-up statements
911
WWUS53 KLOT 100248
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
948 PM CDT Mon Aug 9 2021
ILC091-100257-
/O.CAN.KLOT.TO.W.0036.000000T0000Z-210810T0315Z/
Kankakee IL-
948 PM CDT Mon Aug 9 2021
...THE TORNADO WARNING FOR NORTH CENTRAL KANKAKEE COUNTY IS
CANCELLED...
The tornadic thunderstorm which prompted the warning is tracking
north of the area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1000 PM CDT for northeastern
Illinois.
LAT...LON 4130 8790 4129 8810 4137 8809 4142 8789
TIME...MOT...LOC 0247Z 250DEG 21KT 4133 8805
$$
ILC197-100315-
/O.CON.KLOT.TO.W.0036.000000T0000Z-210810T0315Z/
Will IL-
948 PM CDT Mon Aug 9 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT FOR
SOUTHWESTERN WILL COUNTY...
At 947 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Lakewood Shores, or near Wilmington, moving east at
25 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
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.
Locations impacted include...
Manhattan, Wilton Center and Symerton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 4130 8790 4129 8810 4137 8809 4142 8789
TIME...MOT...LOC 0247Z 250DEG 21KT 4133 8805
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Carlaw954
WWUS53 KLOT 100300
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
1000 PM CDT Mon Aug 9 2021
ILC197-100315-
/O.CON.KLOT.TO.W.0036.000000T0000Z-210810T0315Z/
Will IL-
1000 PM CDT Mon Aug 9 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT FOR SOUTH
CENTRAL WILL COUNTY...
At 959 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Wilton Center, or 7 miles west of Peotone, moving
east at 20 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Manhattan and Wilton Center.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
&&
LAT...LON 4132 8790 4131 8800 4138 8802 4142 8789
TIME...MOT...LOC 0259Z 257DEG 19KT 4136 8795
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Carlaw449
WWUS53 KLOT 100314
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
1014 PM CDT Mon Aug 9 2021
ILC197-100324-
/O.EXP.KLOT.TO.W.0036.000000T0000Z-210810T0315Z/
Will IL-
1014 PM CDT Mon Aug 9 2021
...THE TORNADO WARNING FOR SOUTH CENTRAL WILL COUNTY WILL EXPIRE AT
1015 PM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until midnight CDT for northeastern
Illinois.
LAT...LON 4132 8790 4131 8800 4138 8802 4142 8789
TIME...MOT...LOC 0314Z 261DEG 17KT 4137 8786
$$
CarlawThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 7:18 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 42 min |
| Aug 9, 8:21 PM CDT | Special Marine Warning | LOT | 114 min | |
| Aug 9, 9:19 PM CDT | Special Weather Statement | LOT | Grundy | 26 min |
| Aug 9, 10:06 PM CDT | Tornado Warning | LOT | Will | 54 min |
| Aug 9, 10:12 PM CDT | Special Marine Warning | LOT | 2 hr | |
| Aug 10, 3:07 PM CDT | Heat Advisory | LOT | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 28 hr |
| Aug 10, 5:21 PM CDT | Special Weather Statement | LOT | Lee, Ogle, Winnebago | 54 min |
| Aug 10, 5:39 PM CDT | Severe Thunderstorm Warning | LOT | Lee, Ogle, Winnebago | 81 min |
| Aug 10, 6:10 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, LaSalle, Lee | 65 min |
| Aug 10, 6:16 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, McHenry | 74 min |
| Aug 10, 6:34 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kane, Lake, McHenry | 86 min |
| Aug 10, 6:38 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kane, Kendall | 82 min |
| Aug 10, 6:55 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Will | 95 min |
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.