Alert archive / Indiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 74, NWS Indianapolis, IN

August 12, 2021Decatur County, Indiana

NWS Indianapolis, IN issued this severe thunderstorm warning at Aug 12, 2021, 8:15 PM EDT for Decatur County, Indiana. It was in force for 7 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, 8:15 PM EDT (00:15 UTC)
Expired: Aug 12, 2021, 8:22 PM EDT
In force: 7 min
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Decatur County, IN

The radar

The Indianapolis radar (KIND), 89 km from the middle of the area, began a volume at 00:18 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, 0.3 hours before the alert went out and 132 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: 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.

413 
WUUS53 KIND 130015
SVRIND
INC031-130045-
/O.NEW.KIND.SV.W.0074.210813T0015Z-210813T0045Z/

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

The National Weather Service in Indianapolis has issued a

* Severe Thunderstorm Warning for...
  Northeastern Decatur County in central Indiana...

* Until 845 PM EDT.

* At 815 PM EDT, a severe thunderstorm was located over Lake Santee,
  or 9 miles northwest of Batesville, moving northeast 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 remain over mainly rural areas of
  northeastern Decatur County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3932 8534 3945 8538 3945 8530 3932 8530
TIME...MOT...LOC 0015Z 243DEG 17KT 3942 8530 

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

$$

TDUD

1 follow-up statement

114 
WWUS53 KIND 130022
SVSIND

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

INC031-130032-
/O.CAN.KIND.SV.W.0074.000000T0000Z-210813T0045Z/
Decatur IN-
822 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DECATUR COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

LAT...LON 3932 8534 3945 8538 3945 8530 3932 8530
TIME...MOT...LOC 0020Z 243DEG 17KT 3944 8526 

$$

TDUD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 8:10 PM EDT	Severe Thunderstorm Warning	IND	Jackson	22 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.