Alert archive / Indiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 72, NWS Indianapolis, IN

August 12, 20216 counties in Indiana

NWS Indianapolis, IN issued this severe thunderstorm warning at Aug 12, 2021, 6:30 PM EDT for 6 counties in Indiana. It was in force for 45 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: Aug 12, 2021, 6:30 PM EDT (22:30 UTC)
Expired: Aug 12, 2021, 7:15 PM EDT
In force: 45 min
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clay County, IN, Daviess County, IN, Greene County, IN, Knox County, IN, Owen County, IN, Sullivan County, IN

The radar

The Evansville,IN radar (KVWX), 68 km from the middle of the area, began a volume at 22:33 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
Aug 12, 7:01 PM EDT	TSTM WND DMG	Vincennes, IN	TREE LIMBS 4 TO 6 INCHES IN DIAMETER DOWNED NEAR VINCENNES.

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, 10.5 hours before the alert went out and 176 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: 1191 J/kg
Mixed-layer CIN: -177 J/kg
Mixed-layer LCL: 1149 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted.

126 
WUUS53 KIND 122230
SVRIND
INC021-027-055-083-119-153-122315-
/O.NEW.KIND.SV.W.0072.210812T2230Z-210812T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Indianapolis IN
630 PM EDT Thu Aug 12 2021

The National Weather Service in Indianapolis has issued a

* Severe Thunderstorm Warning for...
  Sullivan County in southwestern Indiana...
  Knox County in southwestern Indiana...
  Southwestern Clay County in west central Indiana...
  Southern Owen County in west central Indiana...
  Greene County in southwestern Indiana...
  Northwestern Daviess County in southwestern Indiana...

* Until 715 PM EDT.

* At 629 PM EDT, severe thunderstorms were located along a line
  extending from 12 miles southeast of Terre Haute to 6 miles
  northeast of Lancaster, moving southeast at 25 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...
  Coalmont, Jasonville, Coal City, Vicksburg, Linton, Worthington 
  and Switz City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3925 8758 3926 8760 3927 8672 3853 8726
      3851 8730 3854 8735 3851 8737 3854 8739
      3853 8747 3852 8747 3858 8764 3864 8762
      3874 8750 3886 8755 3896 8751 3899 8758
      3899 8756 3906 8757 3911 8765
TIME...MOT...LOC 2229Z 337DEG 21KT 3934 8720 3862 8780 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

TDUD

3 follow-up statements

004 
WWUS53 KIND 122248
SVSIND

Severe Weather Statement
National Weather Service Indianapolis IN
648 PM EDT Thu Aug 12 2021

INC021-027-055-083-119-153-122315-
/O.CON.KIND.SV.W.0072.000000T0000Z-210812T2315Z/
Sullivan IN-Knox IN-Clay IN-Owen IN-Greene IN-Daviess IN-
648 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR SULLIVAN...KNOX...SOUTHWESTERN CLAY...SOUTHERN OWEN...GREENE AND
NORTHWESTERN DAVIESS COUNTIES...

At 648 PM EDT, severe thunderstorms were located along a line
extending from 12 miles west of Spencer to 6 miles north of Patoka,
moving southeast at 40 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...
Vincennes, Washington, Linton, Sullivan, Bloomfield, Bicknell,
Jasonville, Worthington, Shelburn, Farmersburg, Dugger, Hymera,
Lyons, Carlisle, Elnora, Oaktown, Monroe City, Wheatland, Bruceville
and Plainville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3927 8672 3853 8726 3851 8730 3854 8735
      3851 8737 3854 8739 3853 8747 3852 8747
      3858 8764 3864 8762 3874 8750 3886 8755
      3896 8751 3910 8746 3926 8742
TIME...MOT...LOC 2248Z 311DEG 33KT 3922 8700 3850 8760 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

TDUD

060 
WWUS53 KIND 122300
SVSIND

Severe Weather Statement
National Weather Service Indianapolis IN
700 PM EDT Thu Aug 12 2021

INC021-119-122310-
/O.CAN.KIND.SV.W.0072.000000T0000Z-210812T2315Z/
Clay IN-Owen IN-
700 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CLAY AND SOUTHERN
OWEN COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area.  Therefore, the warning has been cancelled.

LAT...LON 3854 8735 3851 8737 3854 8740 3852 8748
      3858 8764 3859 8761 3861 8763 3864 8762
      3869 8753 3874 8750 3877 8751 3878 8749
      3885 8753 3886 8755 3890 8738 3913 8716
      3917 8704 3917 8680 3853 8726 3851 8730
TIME...MOT...LOC 2300Z 330DEG 23KT 3916 8694 3844 8754 

$$

INC027-055-083-153-122315-
/O.CON.KIND.SV.W.0072.000000T0000Z-210812T2315Z/
Sullivan IN-Knox IN-Greene IN-Daviess IN-
700 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR SOUTHEASTERN SULLIVAN...KNOX...WESTERN GREENE AND NORTHWESTERN
DAVIESS COUNTIES...

At 700 PM EDT, severe thunderstorms were located along a line
extending from 9 miles north of Bloomfield to near Patoka, moving
southeast at 25 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...
Vincennes, Washington, Linton, Bloomfield, Bicknell, Worthington,
Lyons, Elnora, Oaktown, Monroe City, Wheatland, Bruceville,
Plainville, Sandborn, Edwardsport, Switz City, Newberry,
Freelandville, Vincennes University and Pleasantville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3854 8735 3851 8737 3854 8740 3852 8748
      3858 8764 3859 8761 3861 8763 3864 8762
      3869 8753 3874 8750 3877 8751 3878 8749
      3885 8753 3886 8755 3890 8738 3913 8716
      3917 8704 3917 8680 3853 8726 3851 8730
TIME...MOT...LOC 2300Z 330DEG 23KT 3916 8694 3844 8754 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

TDUD

768 
WWUS53 KIND 122310
SVSIND

Severe Weather Statement
National Weather Service Indianapolis IN
710 PM EDT Thu Aug 12 2021

INC027-055-083-153-122320-
/O.EXP.KIND.SV.W.0072.000000T0000Z-210812T2315Z/
Sullivan IN-Knox IN-Greene IN-Daviess IN-
710 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SULLIVAN...
KNOX...WESTERN GREENE AND NORTHWESTERN DAVIESS COUNTIES WILL EXPIRE
AT 715 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

LAT...LON 3854 8735 3851 8737 3854 8740 3852 8748
      3858 8764 3859 8761 3861 8763 3864 8762
      3869 8753 3874 8750 3877 8751 3878 8749
      3885 8753 3886 8755 3890 8738 3913 8716
      3917 8704 3917 8680 3853 8726 3851 8730
TIME...MOT...LOC 2310Z 337DEG 21KT 3913 8692 3841 8752 

$$

TDUD

The office that day

Everything else NWS Indianapolis, IN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 12, 3:29 AM EDT	Heat Advisory	IND	Bartholomew, Boone, Brown, Carroll, Clay, Clinton and 33 more	16 hr
Aug 12, 7:12 AM EDT	Special Weather Statement	IND	Warren	48 min
Aug 12, 7:35 AM EDT	Severe Thunderstorm Warning	IND	Carroll, Clinton, Tippecanoe, Warren	40 min
Aug 12, 4:00 PM EDT	Severe Thunderstorm Warning	IND	Fountain, Vermillion, Warren	30 min
Aug 12, 4:31 PM EDT	Special Weather Statement	IND	Vermillion	29 min
Aug 12, 5:05 PM EDT	Special Weather Statement	IND	Vigo	25 min
Aug 12, 5:15 PM EDT	Severe Thunderstorm Warning	IND	Clay, Parke	15 min
Aug 12, 6:06 PM EDT	Severe Thunderstorm Warning	IND	Clay, Greene, Sullivan	24 min

Nearby

Severe Thunderstorm Warnings in Indiana, 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.