Alert archive / Illinois / Tornado Warnings in 2023
Tornado Warning 21, NWS Chicago, IL
NWS Chicago, IL issued this tornado warning at Jul 12, 2023, 5:37 PM CDT for 4 counties in Illinois. It was in force for 23 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
- Jul 12, 2023, 5:37 PM CDT (22:37 UTC)
- Expired
- Jul 12, 2023, 6:00 PM CDT
- In force
- 23 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.0 in
Counties DuPage County, IL, Kane County, IL, Kendall County, IL, Will County, IL
The radar
The Chicago radar (KLOT), 20 km from the middle of the area, began a volume at 22:40 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 |
|---|---|---|---|
| Jul 12, 3:53 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.6 hours before the alert went out and 173 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2084 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 80 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
855
WFUS53 KLOT 122237
TORLOT
ILC043-089-093-197-122300-
/O.NEW.KLOT.TO.W.0021.230712T2237Z-230712T2300Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville
537 PM CDT Wed Jul 12 2023
The National Weather Service in Chicago has issued a
* Tornado Warning for...
Northeastern Kendall County in northeastern Illinois...
Northwestern Will County in northeastern Illinois...
Southeastern Kane County in northeastern Illinois...
Southwestern DuPage County in northeastern Illinois...
* Until 600 PM CDT.
* At 537 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Oswego, 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.
* This dangerous storm will be near...
Aurora around 540 PM CDT.
Naperville around 550 PM CDT.
Plainfield around 555 PM CDT.
Other locations in the path of this tornadic thunderstorm include
Bolingbrook and Romeoville.
Including the following interstate...
I-55 near mile marker 262.
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 4164 8839 4173 8839 4179 8817 4164 8813
TIME...MOT...LOC 2237Z 258DEG 24KT 4169 8833
TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN
$$
Izzi2 follow-up statements
141
WWUS53 KLOT 122248
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
548 PM CDT Wed Jul 12 2023
ILC089-093-197-122257-
/O.CAN.KLOT.TO.W.0021.000000T0000Z-230712T2300Z/
Kendall IL-Will IL-Kane IL-
548 PM CDT Wed Jul 12 2023
...THE TORNADO WARNING FOR NORTHEASTERN KENDALL...NORTHWESTERN WILL
AND SOUTHEASTERN KANE COUNTIES IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1000 PM CDT for northeastern
Illinois.
LAT...LON 4179 8817 4173 8815 4173 8816 4172 8817
4172 8826 4176 8826
TIME...MOT...LOC 2247Z 248DEG 25KT 4173 8822
$$
ILC043-122300-
/O.CON.KLOT.TO.W.0021.000000T0000Z-230712T2300Z/
DuPage IL-
548 PM CDT Wed Jul 12 2023
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR
SOUTHWESTERN DUPAGE COUNTY...
At 547 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Naperville, moving east-northeast at 30 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...
Aurora and Naperville.
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 4179 8817 4173 8815 4173 8816 4172 8817
4172 8826 4176 8826
TIME...MOT...LOC 2247Z 248DEG 25KT 4173 8822
TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN
$$
Ogorek015
WWUS53 KLOT 122254
SVSLOT
Severe Weather Statement
National Weather Service Chicago/Romeoville
554 PM CDT Wed Jul 12 2023
ILC043-122303-
/O.EXP.KLOT.TO.W.0021.000000T0000Z-230712T2300Z/
DuPage IL-
554 PM CDT Wed Jul 12 2023
...THE TORNADO WARNING FOR SOUTHWESTERN DUPAGE COUNTY WILL EXPIRE AT
600 PM CDT...
The storm which prompted the warning has weakened below severe
limits and has exited the warned area. Therefore, the warning will
be allowed to expire.
A Tornado Watch remains in effect until 1000 PM CDT for northeastern
Illinois.
LAT...LON 4179 8817 4173 8815 4173 8816 4172 8817
4172 8826 4176 8826
TIME...MOT...LOC 2253Z 258DEG 24KT 4174 8817
$$
OgorekThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 3:49 AM CDT | Flood Watch | LOT | Cook, DuPage, Will | 15 hr |
| Jul 12, 4:24 AM CDT | Areal Flood Advisory | LOT | Cook, DeKalb, Kendall, Will | 3 hr |
| Jul 12, 10:42 AM CDT | River Flood Warning | LOT | Cook | 20 hr |
| Jul 12, 11:42 AM CDT | Special Weather Statement | LOT | Putnam | 63 min |
| Jul 12, 12:05 PM CDT | Special Weather Statement | LOT | LaSalle | 40 min |
| Jul 12, 1:20 PM CDT | Flash Flood Warning | LOT | Cook, DuPage, Will | 3 hr |
| Jul 12, 6:10 PM CDT | Tornado Warning | LOT | Cook | 20 min |
| Jul 12, 6:13 PM CDT | Tornado Warning | LOT | McHenry | 32 min |
| Jul 12, 6:18 PM CDT | Tornado Warning | LOT | Kane | 27 min |
| Jul 12, 6:20 PM CDT | Tornado Warning | LOT | Cook | 23 min |
| Jul 12, 6:22 PM CDT | Special Marine Warning | LOT | 113 min | |
| Jul 12, 6:31 PM CDT | Tornado Warning | LOT | Cook, DuPage | 29 min |
| Jul 12, 6:35 PM CDT | Tornado Warning | LOT | Lake | 25 min |
| Jul 12, 6:51 PM CDT | Tornado Warning | LOT | Cook, DuPage | 24 min |
Nearby
Tornado Warnings in Illinois, 2023Every tornado warning in 2023Tornadoes in 2023
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.