Alert archive / Indiana / Tornado Warnings in 2021

Tornado Warning 7, NWS Chicago, IL

June 21, 2021Porter County, Indiana

NWS Chicago, IL issued this tornado warning at Jun 21, 2021, 12:15 AM CDT for Porter County, Indiana. It was in force for 20 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 21, 2021, 12:15 AM CDT (05:15 UTC)
Expired: Jun 21, 2021, 12:35 AM CDT
In force: 20 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Porter County, IN

The radar

The Chicago radar (KLOT), 88 km from the middle of the area, began a volume at 05:16 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, 12:17 AM CDT	TSTM WND DMG	4 Ese Chesterton, IN	SPORADIC TREE DAMAGE NEAR AND NORTH OF THE INDIANA TOLL ROAD AND EAST OF STATE ROAD 49 SOUTHEAST OF CHESTERTON.

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, 5.3 hours before the alert went out and 204 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.

121 
WFUS53 KLOT 210515
TORLOT
INC127-210545-
/O.NEW.KLOT.TO.W.0007.210621T0515Z-210621T0545Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville
1215 AM CDT Mon Jun 21 2021

The National Weather Service in Chicago has issued a

* Tornado Warning for...
  Northeastern Porter County in northwestern Indiana...

* Until 1245 AM CDT.
    
* At 1214 AM CDT, a severe thunderstorm capable of producing a
  tornado was located over Chesterton, moving east at 60 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
  northeastern Porter County.

Including the following interstates...
 Indiana I-90 between mile markers 27 and 37.
 Indiana I-94 between mile markers 26 and 30, and near mile marker
32.

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.

This cluster 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 4149 8707 4159 8714 4167 8693 4148 8693
TIME...MOT...LOC 0514Z 255DEG 54KT 4158 8708 

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

$$

FRIEDLEIN

2 follow-up statements

676 
WWUS53 KLOT 210525
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
1225 AM CDT Mon Jun 21 2021

INC127-210545-
/O.CON.KLOT.TO.W.0007.000000T0000Z-210621T0545Z/
Porter IN-
1225 AM CDT Mon Jun 21 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT FOR
NORTHEASTERN PORTER COUNTY...
    
At 1224 AM CDT, a severe thunderstorm capable of producing a tornado
was located 5 miles northwest of Westville, moving east at 55 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...
Valparaiso and Chesterton. 

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.

This cluster 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 4149 8707 4159 8706 4167 8693 4148 8693
TIME...MOT...LOC 0524Z 255DEG 48KT 4160 8693 

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

$$

FRIEDLEIN

687 
WWUS53 KLOT 210535
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
1235 AM CDT Mon Jun 21 2021

INC127-210544-
/O.CAN.KLOT.TO.W.0007.000000T0000Z-210621T0545Z/
Porter IN-
1235 AM CDT Mon Jun 21 2021

...THE TORNADO WARNING FOR NORTHEASTERN PORTER COUNTY IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the Tornado Warning has been cancelled.

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

Remember, a Severe Thunderstorm Warning still remains in effect for
Porter County until 1 AM CDT.

LAT...LON 4149 8707 4159 8706 4167 8693 4148 8693
TIME...MOT...LOC 0533Z 255DEG 54KT 4164 8672 

$$

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, 12:00 AM CDT	Tornado Warning	LOT	Jasper, Lake, Newton, Porter	34 min
Jun 21, 12:06 AM CDT	Severe Thunderstorm Warning	LOT	Jasper, Porter	54 min

Nearby

Tornado Warnings in Indiana, 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.