Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 8, NWS Chicago, IL

June 12, 2021Kane County, Kendall County, Will County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 12, 2021, 3:26 PM CDT for Kane County, Kendall County, Will County, Illinois. It was in force for 47 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 12, 2021, 3:26 PM CDT (20:26 UTC)
Expired: Jun 12, 2021, 4:13 PM CDT
In force: 47 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Kane County, IL, Kendall County, IL, Will County, IL

The radar

The Chicago radar (KLOT), 3 km from the middle of the area, began a volume at 20:29 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.

What was reported inside it

Time	Report	Where	Remark
Jun 12, 3:41 PM CDT	HAIL 0.5	3 Se Sugar Grove, IL

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.4 hours before the alert went out and 168 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: 897 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 1584 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 29 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

102 
WUUS53 KLOT 122026
SVRLOT
ILC089-093-197-122145-
/O.NEW.KLOT.SV.W.0008.210612T2026Z-210612T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Chicago/Romeoville
326 PM CDT Sat Jun 12 2021

The National Weather Service in Chicago has issued a

* Severe Thunderstorm Warning for...
  Kendall County in northeastern Illinois...
  Northwestern Will County in northeastern Illinois...
  Southwestern Kane County in northeastern Illinois...

* Until 445 PM CDT.

* At 326 PM CDT, a severe thunderstorm was located over Sugar Grove,
  or 7 miles southwest of Batavia, moving southeast at 15 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Joliet, Bolingbrook, Orland Park, Tinley Park, Romeoville,
  Plainfield, Woodridge, Oswego, Lockport, New Lenox, Homer Glen,
  Mokena, Frankfort, Yorkville, Channahon, Minooka, Plano, Sandwich,
  Crest Hill and Montgomery.

Including the following interstates...
 I-55 between mile markers 249 and 267.
 I-80 between mile markers 124 and 149.
 I-88 between mile markers 109 and 113.
 I-355 between mile markers 1 and 7, and near mile marker 11.	

This includes...  University of St. Francis, Chicagoland Speedway...
Route 66 Raceway, Joliet Junior College, Joliet Slammers Baseball,
Lewis University, and Waubonsee Community College.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4147 8779 4146 8859 4181 8860 4184 8840
      4165 8838 4169 8803 4164 8803 4164 8791
      4156 8791 4156 8779
TIME...MOT...LOC 2026Z 325DEG 12KT 4181 8844 

HAIL...1.00IN
WIND...60MPH
 
$$

Borchardt

3 follow-up statements

728 
WWUS53 KLOT 122039
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
339 PM CDT Sat Jun 12 2021

ILC089-093-197-122145-
/O.CON.KLOT.SV.W.0008.000000T0000Z-210612T2145Z/
Kendall IL-Will IL-Kane IL-
339 PM CDT Sat Jun 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR KENDALL...NORTHWESTERN WILL AND SOUTHWESTERN KANE COUNTIES...

At 338 PM CDT, a severe thunderstorm was located over Montgomery, or 
near Oswego, moving southeast at 15 mph. Additional severe 
thunderstorms were moving into Will county, as well. 

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Joliet, Bolingbrook, Orland Park, Tinley Park, Romeoville,
Plainfield, Woodridge, Oswego, Lockport, New Lenox, Homer Glen,
Mokena, Frankfort, Yorkville, Channahon, Minooka, Plano, Sandwich,
Crest Hill and Montgomery.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4147 8779 4146 8859 4181 8860 4184 8840
      4165 8838 4169 8803 4164 8803 4164 8791
      4156 8791 4156 8779
TIME...MOT...LOC 2038Z 329DEG 14KT 4174 8838 

HAIL...1.00IN
WIND...60MPH
 
$$

Borchardt

025 
WWUS53 KLOT 122052
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
352 PM CDT Sat Jun 12 2021

ILC089-093-122102-
/O.CAN.KLOT.SV.W.0008.000000T0000Z-210612T2145Z/
Kendall IL-Kane IL-
352 PM CDT Sat Jun 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR KENDALL AND SOUTHWESTERN KANE
COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4147 8779 4146 8825 4166 8826 4169 8803
      4164 8803 4164 8791 4156 8791 4156 8779
TIME...MOT...LOC 2052Z 319DEG 22KT 4156 8814 

$$

ILC197-122145-
/O.CON.KLOT.SV.W.0008.000000T0000Z-210612T2145Z/
Will IL-
352 PM CDT Sat Jun 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR NORTHWESTERN WILL COUNTY...

At 352 PM CDT, a severe thunderstorm was located over Crest Hill, or
over Joliet, moving southeast at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Joliet, Bolingbrook, Orland Park, Tinley Park, Romeoville,
Plainfield, Woodridge, Lockport, New Lenox, Homer Glen, Mokena,
Frankfort, Channahon, Crest Hill, Shorewood, Frankfort Square,
Ingalls Park, Preston Heights, Fairmont and Rockdale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4147 8779 4146 8825 4166 8826 4169 8803
      4164 8803 4164 8791 4156 8791 4156 8779
TIME...MOT...LOC 2052Z 319DEG 22KT 4156 8814 

HAIL...<.75IN
WIND...60MPH
 
$$

Borchardt

159 
WWUS53 KLOT 122113
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
413 PM CDT Sat Jun 12 2021

ILC197-122123-
/O.CAN.KLOT.SV.W.0008.000000T0000Z-210612T2145Z/
Will IL-
413 PM CDT Sat Jun 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WILL COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds and
heavy rain are still possible with this thunderstorm.

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

LAT...LON 4147 8779 4146 8825 4166 8826 4169 8803
      4164 8803 4164 8791 4156 8791 4156 8779
TIME...MOT...LOC 2112Z 325DEG 12KT 4150 8808 

$$

Borchardt

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 1:23 PM CDT	Special Weather Statement	LOT	Cook, DeKalb, DuPage, Grundy, Kane, Kankakee and 5 more	112 min
Jun 12, 1:52 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	68 min
Jun 12, 2:26 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	41 min
Jun 12, 2:37 PM CDT	Areal Flood Advisory	LOT	Cook, DuPage	3 hr
Jun 12, 2:55 PM CDT	Severe Thunderstorm Warning	LOT	DuPage, Kane, Kendall, Will	65 min
Jun 12, 4:13 PM CDT	Special Weather Statement	LOT	Kankakee	62 min
Jun 12, 5:04 PM CDT	Special Weather Statement	LOT	Ford, Iroquois	71 min
Jun 12, 5:11 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Livingston	64 min
Jun 12, 5:30 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois	45 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2021 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.