Alert archive / Indiana / Tornado Warnings in 2021

Tornado Warning 6, NWS Chicago, IL

June 21, 20214 counties in Indiana; Will County, Illinois

NWS Chicago, IL issued this tornado warning at Jun 21, 2021, 12:00 AM CDT for 4 counties in Indiana; Will County, Illinois. It was in force for 34 min. 7 reports 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 21, 2021, 12:00 AM CDT (05:00 UTC)
Expired: Jun 21, 2021, 12:34 AM CDT
In force: 34 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Will County, IL, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 68 km from the middle of the area, began a volume at 05:03 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 21, 12:04 AM CDT	TSTM WND DMG	Cedar Lake, IN	TWO TREES DOWNED ONTO HOUSES IN CEDAR LAKE. TIME ESTIMATED BY RADAR.
Jun 21, 12:05 AM CDT	TSTM WND DMG	1 N Hobart, IN	PUBLIC REPORT OF TREE DAMAGE IN HOBART. TIME ESTIMATED BY RADAR.
Jun 21, 12:07 AM CDT	TSTM WND DMG	2 Sse Lake Station, IN	TREE DAMAGE IN CAMELOT ESTATES IN PORTAGE. TIME ESTIMATED BY RADAR.
Jun 21, 12:08 AM CDT	TSTM WND DMG	1 Sw Portage, IN	NUMEROUS POWER LINES DOWNED IN PORTAGE. TIME ESTIMATED BY RADAR.
Jun 21, 12:10 AM CDT	TSTM WND DMG	South Haven, IN	DOWNED TREE CAUSED STRUCTURE DAMAGE ON EAGLE CREEK ROAD IN SOUTH HAVEN. TIME ESTIMATED BY RADAR.
Jun 21, 12:11 AM CDT	TSTM WND DMG	1 N South Haven, IN	CONSIDERABLE TREE DAMAGE DIRECTED IN AN EASTERLY DIRECTION ALONG LUTE ROAD, EAST TOWARDS THE ROBBINHURST GOLF CLUB. A SMALL OUTBUILDING WAS DAMAGED ON THE GOLF COURSE.
Jun 21, 12:11 AM CDT	TORNADO	1 Nne South Haven, IN	AN NWS SURVEY, ALONG WITH INFORMATION RELAYED BY THE PORTER COUNTY EMERGENCY MANAGEMENT AGENCY, INDICATE A SWATH OF STRAIGHT-LINE WIND DAMAGE EXTENDING FROM HOBART TO THE ROBBINHURST GOLF CLUB JUST NORTH OF SOUTH HAVEN. A SMALL OUTBUILDING WAS HEAVILY DAMAGED

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 20, 9:40 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 5.0 hours before the alert went out and 170 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: 1632 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1351 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 421 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 13.7

Open this sounding in Storm Lab

The text

As transmitted.

165 
WFUS53 KLOT 210500
TORLOT
ILC197-INC073-089-111-127-210545-
/O.NEW.KLOT.TO.W.0006.210621T0500Z-210621T0545Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville
1200 AM CDT Mon Jun 21 2021

The National Weather Service in Chicago has issued a

* Tornado Warning for...
  East central Will County in northeastern Illinois...
  Northeastern Newton County in northwestern Indiana...
  Southwestern Porter County in northwestern Indiana...
  Lake County in northwestern Indiana...
  Northwestern Jasper County in northwestern Indiana...

* Until 1245 AM CDT.
    
* At 1200 AM CDT, a line of severe thunderstorms capable of 
  producing brief tornadoes was located near St. John, or near Cedar 
  Lake, to Beecher, moving east 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.

* This dangerous storm will be near...
  Cedar Lake around 1205 AM CDT.
  Crown Point, Lowell and Lake Dalecarlia around 1210 AM CDT.
  Winfield around 1215 AM CDT.
  Lakes of the Four Seasons around 1220 AM CDT.

Other locations in the path of this tornadic thunderstorm include
Hebron.

This includes...  Indiana University Northwest, Illiana Motor
Speedway, and Lake County Fairgrounds.
 
Including the following interstates...
 Indiana I-80 between mile markers 8 and 14.
 Indiana I-90 between mile markers 23 and 30.
 Indiana I-65 between mile markers 227 and 260.

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 4128 8708 4109 8727 4124 8753 4130 8753
      4130 8763 4144 8753 4157 8739 4159 8706
TIME...MOT...LOC 0500Z 282DEG 38KT 4140 8750 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

FRIEDLEIN

3 follow-up statements

230 
WWUS53 KLOT 210512
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
1212 AM CDT Mon Jun 21 2021

ILC197-210520-
/O.CAN.KLOT.TO.W.0006.000000T0000Z-210621T0545Z/
Will IL-
1212 AM CDT Mon Jun 21 2021

...THE TORNADO WARNING FOR EAST CENTRAL WILL COUNTY IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the Tornado Warning has been cancelled. However, 
severe winds are still likely for a period within the Severe 
Thunderstorm Warning.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
northeastern Illinois...and northwestern Indiana.

LAT...LON 4128 8708 4109 8727 4124 8753 4134 8752
      4158 8727 4159 8706
TIME...MOT...LOC 0510Z 276DEG 39KT 4157 8720 4126 8749 

$$

INC073-089-111-127-210545-
/O.CON.KLOT.TO.W.0006.000000T0000Z-210621T0545Z/
Newton IN-Porter IN-Lake IN-Jasper IN-
1212 AM CDT Mon Jun 21 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT FOR
NORTHEASTERN NEWTON...SOUTHWESTERN PORTER...LAKE AND NORTHWESTERN
JASPER COUNTIES...
    
At 1210 AM CDT, a line severe thunderstorms capable of producing 
multiple tornadoes were located along a line extending from Portage 
to near Lowell, moving east at 45 mph. The strongest areas of 
rotation include near Portage and near Lowell.

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.

These dangerous storms will be near...
  Portage, Hobart, Chesterton, Lake Station and South Haven around 
  1215 AM CDT.
  Valparaiso around 1220 AM CDT.

Other locations in the path of these tornadic storms include
Roselawn, DeMotte and Hebron.

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 4128 8708 4109 8727 4124 8753 4134 8752
      4158 8727 4159 8706
TIME...MOT...LOC 0510Z 276DEG 39KT 4157 8720 4126 8749 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

FRIEDLEIN

699 
WWUS53 KLOT 210520
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
1220 AM CDT Mon Jun 21 2021

INC073-089-111-127-210545-
/O.CON.KLOT.TO.W.0006.000000T0000Z-210621T0545Z/
Newton IN-Porter IN-Lake IN-Jasper IN-
1220 AM CDT Mon Jun 21 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT FOR
NORTHEASTERN NEWTON...SOUTHWESTERN PORTER...SOUTHEASTERN LAKE AND
NORTHWESTERN JASPER COUNTIES...
    
At 1219 AM CDT, severe thunderstorms capable of producing tornadoes
were located along a line extending from near Chesterton to near 
Shelby, moving east at 45 mph. The strongest areas of rotation were 
east of Portage and west of Hebron.

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.

These dangerous storms will be near...
  Chesterton around 1225 AM CDT.

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!

This line of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4128 8708 4109 8727 4121 8748 4159 8714
      4159 8706
TIME...MOT...LOC 0519Z 281DEG 40KT 4155 8705 4123 8734 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

FRIEDLEIN

030 
WWUS53 KLOT 210534
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
1234 AM CDT Mon Jun 21 2021

INC073-089-111-127-210542-
/O.CAN.KLOT.TO.W.0006.000000T0000Z-210621T0545Z/
Newton IN-Porter IN-Lake IN-Jasper IN-
1234 AM CDT Mon Jun 21 2021

...THE TORNADO WARNING FOR NORTHEASTERN NEWTON...SOUTHWESTERN
PORTER...SOUTHEASTERN LAKE AND NORTHWESTERN JASPER COUNTIES IS
CANCELLED...
    
The storms which prompted the warning have weakened in rotation. 
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
northwestern Indiana.

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

Remember, a Severe Thunderstorm Warning still remains in effect for
Porter, Lake, Newton, and Jasper Counties until 1 AM CDT.

LAT...LON 4128 8708 4109 8727 4121 8748 4159 8714
      4159 8706
TIME...MOT...LOC 0532Z 282DEG 38KT 4152 8687 4120 8716 

$$

FRIEDLEIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 11:08 PM CDT	Areal Flood Advisory	LOT	Lake	4 hr
Jun 20, 11:41 PM CDT	Severe Thunderstorm Warning	LOT	Jasper, Lake, Newton, Porter	79 min
Jun 21, 12:06 AM CDT	Severe Thunderstorm Warning	LOT	Jasper, Porter	54 min
Jun 21, 12:15 AM CDT	Tornado Warning	LOT	Porter	20 min
Jun 20, 8:39 PM CDT	Severe Thunderstorm Warning	LOT	Winnebago	21 min
Jun 20, 9:02 PM CDT	Severe Thunderstorm Warning	LOT	Ogle	58 min
Jun 20, 10:12 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb	33 min
Jun 20, 10:22 PM CDT	Severe Thunderstorm Warning	LOT	Kane	53 min
Jun 20, 10:40 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	50 min
Jun 20, 10:43 PM CDT	Tornado Warning	LOT	DuPage, Kane	32 min
Jun 20, 10:46 PM CDT	Tornado Warning	LOT	Cook, DuPage	20 min
Jun 20, 10:48 PM CDT	Special Marine Warning	LOT		117 min
Jun 20, 10:50 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Grundy, Kane, Kendall, LaSalle	55 min
Jun 20, 10:56 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Will	79 min
Jun 20, 11:05 PM CDT	Tornado Warning	LOT	Cook, DuPage, Will	40 min
Jun 20, 11:15 PM CDT	Tornado Warning	LOT	Cook, DuPage	30 min
Jun 20, 11:30 PM CDT	Severe Thunderstorm Warning	LOT	Cook	30 min
Jun 21, 3:22 PM CDT	Small Craft Advisory	LOT		7 hr

Nearby

Tornado Warnings in Indiana, 2021 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.