Alert archive / Indiana / Tornado Warnings in 2021

Tornado Warning 42, NWS Chicago, IL

December 10, 2021Jasper County, Porter County, Indiana

NWS Chicago, IL issued this tornado warning at Dec 10, 2021, 10:04 PM CST for Jasper County, Porter County, Indiana. It was in force for 26 min. 2 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: Dec 10, 2021, 10:04 PM CST (04:04 UTC)
Expired: Dec 10, 2021, 10:30 PM CST
In force: 26 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Jasper County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 89 km from the middle of the area, began a volume at 04:05 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
Dec 10, 10:17 PM CST	TSTM WND GST 72	Demotte, IN
Dec 10, 10:38 PM CST	TSTM WND DMG	Wheatfield, IN	COUPLE LARGE TREES DOWNED IN THE AREA, AS WELL AS SEVERAL DOWNED MEDIUM TO LARGE TREES SCATTERED ABOUT THE COUNTY.

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
Dec 10, 7:47 PM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 4.1 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: 119 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 662 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 341 m²/s²
0-3 km storm-relative helicity: 357 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

931 
WFUS53 KLOT 110404
TORLOT
INC073-127-110430-
/O.NEW.KLOT.TO.W.0042.211211T0404Z-211211T0430Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville
1004 PM CST Fri Dec 10 2021

The National Weather Service in Chicago has issued a

* Tornado Warning for...
  Southern Porter County in northwestern Indiana...
  Northern Jasper County in northwestern Indiana...

* Until 1030 PM CST.
    
* At 1003 PM CST, a severe thunderstorm capable of producing a
  tornado was located near Roselawn, or 7 miles south of DeMotte,
  moving northeast at 65 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...
  Wheatfield around 1015 PM CST.
  Kouts around 1020 PM CST.

Including the following interstate...
 Indiana I-65 between mile markers 222 and 231.
 
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 4103 8728 4121 8727 4124 8722 4125 8722
      4149 8693 4115 8693
TIME...MOT...LOC 0403Z 228DEG 57KT 4110 8723 

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

$$

Kluber

2 follow-up statements

393 
WWUS53 KLOT 110419
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
1019 PM CST Fri Dec 10 2021

INC073-127-110430-
/O.CON.KLOT.TO.W.0042.000000T0000Z-211211T0430Z/
Porter IN-Jasper IN-
1019 PM CST Fri Dec 10 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1030 PM CST FOR
SOUTHEASTERN PORTER AND NORTHEASTERN JASPER COUNTIES...
    
At 1018 PM CST, a severe thunderstorm capable of producing a tornado
was located near Wheatfield, moving northeast at 50 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
southeastern Porter and northeastern Jasper Counties, including the
following locations...Dunns Bridge.

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 4118 8701 4121 8705 4127 8706 4136 8693
      4120 8693
TIME...MOT...LOC 0418Z 224DEG 45KT 4124 8702 

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

$$

Kluber

177 
WWUS53 KLOT 110424
SVSLOT

Severe Weather Statement
National Weather Service Chicago/Romeoville
1024 PM CST Fri Dec 10 2021

INC073-127-110434-
/O.EXP.KLOT.TO.W.0042.000000T0000Z-211211T0430Z/
Porter IN-Jasper IN-
1024 PM CST Fri Dec 10 2021

...THE TORNADO WARNING FOR SOUTHEASTERN PORTER AND NORTHEASTERN
JASPER COUNTIES WILL EXPIRE AT 1030 PM CST...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

A Tornado Watch remains in effect until 200 AM CST for northwestern
Indiana.

LAT...LON 4118 8701 4121 8705 4127 8706 4136 8693
      4120 8693
TIME...MOT...LOC 0424Z 228DEG 57KT 4128 8696 

$$

Kluber

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 10, 9:46 PM CST	Severe Thunderstorm Warning	LOT	Lake, Newton	44 min
Dec 10, 9:55 PM CST	Special Weather Statement	LOT	Benton, Jasper, Newton	65 min
Dec 10, 10:00 PM CST	Tornado Warning	LOT	Lake	16 min
Dec 10, 10:11 PM CST	Severe Thunderstorm Warning	LOT	Porter	34 min
Dec 10, 10:22 PM CST	Severe Thunderstorm Warning	LOT	Benton, Jasper, Newton	38 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.