Alert archive / Indiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 73, NWS Indianapolis, IN

August 12, 2021Jackson County, Indiana

NWS Indianapolis, IN issued this severe thunderstorm warning at Aug 12, 2021, 8:10 PM EDT for Jackson County, Indiana. It was in force for 22 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 12, 2021, 8:10 PM EDT (00:10 UTC)
Expired
Aug 12, 2021, 8:32 PM EDT
In force
22 min
Issued by
NWS Indianapolis, IN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Jackson County, IN

The radar

The Indianapolis radar (KIND), 95 km from the middle of the area, began a volume at 00:10 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.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 0.2 hours before the alert went out and 202 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-pSkew-T log-p diagram, Cncnati-Daytn, OH at 00:00Z on 2021-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2022 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 00:00Z on 2021-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 98 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
2022 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1499 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
98 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.7

Open this sounding in Storm Lab

The text

As transmitted.

231 
WUUS53 KIND 130010
SVRIND
INC071-130100-
/O.NEW.KIND.SV.W.0073.210813T0010Z-210813T0100Z/

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

The National Weather Service in Indianapolis has issued a

* Severe Thunderstorm Warning for...
  Central Jackson County in south central Indiana...

* Until 900 PM EDT.

* At 810 PM EDT, a severe thunderstorm was located over Brownstown,
  or 7 miles southwest of Seymour, moving east at 20 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.

* This severe thunderstorm will be near...
  Cortland around 825 PM EDT.

Other locations in the path of this severe thunderstorm include
Seymour.

This includes Interstate 65 between mile markers 42 and 54.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3878 8617 3892 8619 3905 8580 3885 8580
TIME...MOT...LOC 0010Z 255DEG 15KT 3889 8602 

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

$$

TDUD
2 follow-up statements
231 
WWUS53 KIND 130021
SVSIND

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

INC071-130100-
/O.CON.KIND.SV.W.0073.000000T0000Z-210813T0100Z/
Jackson IN-
821 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR EASTERN JACKSON COUNTY...

At 821 PM EDT, a severe thunderstorm was located near Seymour, moving
east 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...
  Seymour.

This includes Interstate 65 between mile markers 42 and 54.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3879 8611 3895 8610 3905 8580 3885 8580
TIME...MOT...LOC 0021Z 255DEG 15KT 3890 8596 

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

$$

TDUD
117 
WWUS53 KIND 130032
SVSIND

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

INC071-130042-
/O.CAN.KIND.SV.W.0073.000000T0000Z-210813T0100Z/
Jackson IN-
832 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN JACKSON 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.

LAT...LON 3879 8611 3895 8610 3905 8580 3885 8580
TIME...MOT...LOC 0030Z 255DEG 15KT 3891 8590 

$$

TDUD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 8:15 PM EDTSevere Thunderstorm WarningINDDecatur7 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.