Alert archive / Illinois / Tornado Warnings in 2021

Tornado Warning 11, NWS Chicago, IL

June 26, 2021Will County, Illinois

NWS Chicago, IL issued this tornado warning at Jun 26, 2021, 11:34 AM CDT for Will County, Illinois. It was in force for 26 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: Jun 26, 2021, 11:34 AM CDT (16:34 UTC)
Expired: Jun 26, 2021, 12:00 PM CDT
In force: 26 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Will County, IL

The radar

The Chicago radar (KLOT), 37 km from the middle of the area, began a volume at 16:34 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, 4.6 hours before the alert went out and 131 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 683 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 684 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 263 m²/s²
0-3 km storm-relative helicity: 229 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted.

441 
WFUS53 KLOT 261634
TORLOT
ILC197-261700-
/O.NEW.KLOT.TO.W.0011.210626T1634Z-210626T1700Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville
1134 AM CDT Sat Jun 26 2021

The National Weather Service in Chicago has issued a

* Tornado Warning for...
  Southwestern Will County in northeastern Illinois...

* Until noon CDT.
    
* At 1133 AM CDT, a severe thunderstorm capable of producing a
  tornado was located over Lakewood Shores, or over Wilmington,
  moving northeast at 35 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 County, including the following locations...
  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 4126 8824 4126 8825 4141 8806 4128 8802
      4120 8818
TIME...MOT...LOC 1633Z 228DEG 31KT 4126 8817 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Birk

1 follow-up statement

189 
WWUS53 KLOT 261652
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
1152 AM CDT Sat Jun 26 2021

ILC197-261702-
/O.EXP.KLOT.TO.W.0011.000000T0000Z-210626T1700Z/
Will IL-
1152 AM CDT Sat Jun 26 2021

...THE TORNADO WARNING FOR SOUTHWESTERN WILL COUNTY WILL EXPIRE AT
NOON CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 4126 8824 4126 8825 4141 8806 4128 8802
      4120 8818
TIME...MOT...LOC 1652Z 228DEG 31KT 4136 8802 

$$

Birk

The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 25, 8:01 PM CDT	Tornado Warning	LOT	Iroquois	31 min
Jun 25, 8:11 PM CDT	Tornado Warning	LOT	Iroquois	22 min
Jun 25, 8:37 PM CDT	Areal Flood Advisory	LOT	Ford, Iroquois, Kankakee, Livingston	5 hr
Jun 25, 9:11 PM CDT	Special Weather Statement	LOT	Ford	64 min
Jun 25, 10:39 PM CDT	Special Weather Statement	LOT	Ford	66 min
Jun 26, 11:27 AM CDT	Tornado Warning	LOT	Livingston	18 min
Jun 26, 11:44 AM CDT	Tornado Warning	LOT	Grundy, LaSalle, Livingston	36 min
Jun 26, 11:49 AM CDT	Tornado Warning	LOT	Cook	26 min
Jun 26, 11:55 AM CDT	Special Marine Warning	LOT		2 hr
Jun 26, 12:18 PM CDT	Flash Flood Warning	LOT	Cook, DuPage, Will	6 hr
Jun 26, 12:33 PM CDT	Special Marine Warning	LOT		117 min
Jun 26, 12:34 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	41 min
Jun 26, 12:59 PM CDT	Severe Thunderstorm Warning	LOT	Cook	11 min
Jun 26, 1:26 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	34 min
Jun 26, 2:08 PM CDT	Tornado Warning Tornado observed	LOT	Cook, Will	25 min
Jun 26, 2:24 PM CDT	Special Marine Warning	LOT		2 hr
Jun 26, 2:43 PM CDT	Areal Flood Advisory	LOT	Cook, Ford, Grundy, Iroquois, Kankakee, LaSalle and 2 more	6 hr
Jun 26, 3:31 PM CDT	Special Marine Warning	LOT		119 min
Jun 26, 3:34 PM CDT	Tornado Warning	LOT	Livingston	41 min
Jun 26, 3:50 PM CDT	Flash Flood Warning	LOT	Cook, Grundy, Kankakee, Will	6 hr
Jun 26, 3:56 PM CDT	Tornado Warning	LOT	Kankakee, Will	34 min
Jun 26, 3:57 PM CDT	Flash Flood Warning	LOT	Ford, Grundy, Iroquois, Kankakee, Livingston	6 hr
Jun 26, 3:57 PM CDT	Tornado Warning	LOT	Grundy, Kankakee, Livingston	33 min
Jun 26, 4:13 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Livingston	47 min
Jun 26, 4:23 PM CDT	Tornado Warning	LOT	Ford, Livingston	36 min
Jun 26, 4:26 PM CDT	River Flood Warning	LOT	Cook	28 hr
Jun 26, 4:26 PM CDT	Tornado Warning	LOT	Cook, Will	34 min
Jun 26, 4:30 PM CDT	Special Marine Warning	LOT		2 hr
Jun 26, 4:41 PM CDT	Tornado Warning	LOT	Kankakee	34 min
Jun 26, 4:49 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Kankakee, Will	56 min
Jun 26, 5:21 PM CDT	Severe Thunderstorm Warning	LOT	Will	54 min
Jun 26, 5:44 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	76 min
Jun 26, 5:54 PM CDT	Areal Flood Advisory	LOT	Ford, Iroquois, Livingston	3 hr
Jun 26, 6:23 PM CDT	Areal Flood Advisory	LOT	Cook, DuPage, Will	7 hr
Jun 26, 6:55 PM CDT	River Flood Warning	LOT	Livingston	3 days

Nearby

Tornado Warnings in Illinois, 2021 Every tornado warning in 2021 Tornadoes 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.