Alert archive / Illinois / Tornado Warnings in 2021

Tornado Warning 13, NWS Chicago, IL

June 26, 2021Cook County, Illinois

NWS Chicago, IL issued this tornado warning at Jun 26, 2021, 11:49 AM CDT for Cook 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, 11:49 AM CDT (16:49 UTC)
Expired
Jun 26, 2021, 12:15 PM CDT
In force
26 min
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

County Cook County, IL

The radar

The Chicago radar (KLOT), 49 km from the middle of the area, began a volume at 16:50 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, 4.8 hours before the alert went out and 211 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2021-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 683 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2021-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 263 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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.

483 
WFUS53 KLOT 261649
TORLOT
ILC031-261715-
/O.NEW.KLOT.TO.W.0013.210626T1649Z-210626T1715Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville
1149 AM CDT Sat Jun 26 2021

The National Weather Service in Chicago has issued a

* Tornado Warning for...
  East central Cook County in northeastern Illinois...

* Until 1215 PM CDT.
    
* At 1149 AM CDT, a severe thunderstorm capable of producing a
  tornado was located over East Garfield Park, or over West Town,
  moving northeast at 40 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...
  Lincoln Park, Navy Pier and Near North Side around 1155 AM CDT.
  Lake View, Uptown and Edgewater around 1200 PM CDT.

This includes...  Lincoln Park Zoo, Hawthorne Park, Soldier Field,
University of Illinois Chicago, Wrigley Field, The Loop, Museum
Campus, and Northerly Island.
 
Including the following interstates...
 I-55 between mile markers 285 and 294.
 I-94 between mile markers 44 and 55.
 I-290 between mile markers 19 and 29.
 I-294 between mile markers 44 and 55.

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 or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4197 8764 4196 8763 4196 8764 4191 8762
      4190 8762 4189 8761 4188 8762 4187 8762
      4187 8761 4184 8761 4178 8777 4189 8788
      4200 8766
TIME...MOT...LOC 1649Z 233DEG 34KT 4187 8770 

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

OEMC zones...TORNADO WARNING.  
1...2...3...4...5...6...7...and 8.
 
$$

RC
2 follow-up statements
691 
WWUS53 KLOT 261703
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
1203 PM CDT Sat Jun 26 2021

ILC031-261715-
/O.CON.KLOT.TO.W.0013.000000T0000Z-210626T1715Z/
Cook IL-
1203 PM CDT Sat Jun 26 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1215 PM CDT FOR EAST
CENTRAL COOK COUNTY...
    
At 1203 PM CDT, a severe thunderstorm capable of producing a tornado
was located over South Lawndale, moving northeast at 45 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...
  Chicago Loop, Navy Pier, Northerly Island, Near North Side, 
  Chicago, Lincoln Park, Lake View, Uptown and Edgewater.

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 or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4197 8764 4196 8763 4196 8764 4191 8762
      4190 8762 4189 8761 4188 8762 4187 8762
      4187 8761 4184 8761 4178 8777 4189 8788
      4200 8766
TIME...MOT...LOC 1703Z 229DEG 41KT 4185 8773 

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

OEMC zones...TORNADO WARNING.  
1...2...3...4...5...6...7...and 8.
 
$$

RC
571 
WWUS53 KLOT 261715
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
1215 PM CDT Sat Jun 26 2021

ILC031-261725-
/O.EXP.KLOT.TO.W.0013.000000T0000Z-210626T1715Z/
Cook IL-
1215 PM CDT Sat Jun 26 2021

...THE TORNADO WARNING FOR EAST CENTRAL COOK COUNTY HAS EXPIRED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has 
been allowed to expire.  However gusty winds and torrential rain are 
still occurring with the thunderstorms moving over the area.

A Tornado Watch remains in effect until 700 PM CDT for northeastern
Illinois.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Chicago.

LAT...LON 4197 8764 4196 8763 4196 8764 4191 8762
      4190 8762 4189 8761 4188 8762 4187 8762
      4187 8761 4184 8761 4178 8777 4189 8788
      4200 8766
TIME...MOT...LOC 1715Z 233DEG 34KT 4190 8764 

$$

RC

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 25, 8:01 PM CDTTornado WarningLOTIroquois31 min
Jun 25, 8:11 PM CDTTornado WarningLOTIroquois22 min
Jun 25, 8:37 PM CDTAreal Flood AdvisoryLOTFord, Iroquois, Kankakee, Livingston5 hr
Jun 25, 9:11 PM CDTSpecial Weather StatementLOTFord64 min
Jun 25, 10:39 PM CDTSpecial Weather StatementLOTFord66 min
Jun 26, 11:27 AM CDTTornado WarningLOTLivingston18 min
Jun 26, 11:34 AM CDTTornado WarningLOTWill26 min
Jun 26, 11:44 AM CDTTornado WarningLOTGrundy, LaSalle, Livingston36 min
Jun 26, 11:55 AM CDTSpecial Marine WarningLOT2 hr
Jun 26, 12:18 PM CDTFlash Flood WarningLOTCook, DuPage, Will6 hr
Jun 26, 12:33 PM CDTSpecial Marine WarningLOT117 min
Jun 26, 12:34 PM CDTSevere Thunderstorm WarningLOTCook, Will41 min
Jun 26, 12:59 PM CDTSevere Thunderstorm WarningLOTCook11 min
Jun 26, 1:26 PM CDTSevere Thunderstorm WarningLOTCook, Will34 min
Jun 26, 2:08 PM CDTTornado Warning Tornado observedLOTCook, Will25 min
Jun 26, 2:24 PM CDTSpecial Marine WarningLOT2 hr
Jun 26, 2:43 PM CDTAreal Flood AdvisoryLOTCook, Ford, Grundy, Iroquois, Kankakee, LaSalle and 2 more6 hr
Jun 26, 3:31 PM CDTSpecial Marine WarningLOT119 min
Jun 26, 3:34 PM CDTTornado WarningLOTLivingston41 min
Jun 26, 3:50 PM CDTFlash Flood WarningLOTCook, Grundy, Kankakee, Will6 hr
Jun 26, 3:56 PM CDTTornado WarningLOTKankakee, Will34 min
Jun 26, 3:57 PM CDTFlash Flood WarningLOTFord, Grundy, Iroquois, Kankakee, Livingston6 hr
Jun 26, 3:57 PM CDTTornado WarningLOTGrundy, Kankakee, Livingston33 min
Jun 26, 4:13 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Livingston47 min
Jun 26, 4:23 PM CDTTornado WarningLOTFord, Livingston36 min
Jun 26, 4:26 PM CDTRiver Flood WarningLOTCook28 hr
Jun 26, 4:26 PM CDTTornado WarningLOTCook, Will34 min
Jun 26, 4:30 PM CDTSpecial Marine WarningLOT2 hr
Jun 26, 4:41 PM CDTTornado WarningLOTKankakee34 min
Jun 26, 4:49 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Kankakee, Will56 min
Jun 26, 5:21 PM CDTSevere Thunderstorm WarningLOTWill54 min
Jun 26, 5:44 PM CDTSevere Thunderstorm WarningLOTIroquois76 min
Jun 26, 5:54 PM CDTAreal Flood AdvisoryLOTFord, Iroquois, Livingston3 hr
Jun 26, 6:23 PM CDTAreal Flood AdvisoryLOTCook, DuPage, Will7 hr
Jun 26, 6:55 PM CDTRiver Flood WarningLOTLivingston3 days

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.