Alert archive / Indiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 58, NWS Indianapolis, IN

July 29, 2021Decatur County, Shelby County, Indiana

NWS Indianapolis, IN issued this severe thunderstorm warning at Jul 29, 2021, 8:11 PM EDT for Decatur County, Shelby County, Indiana. It was in force for 34 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: Jul 29, 2021, 8:11 PM EDT (00:11 UTC)
Expired: Jul 29, 2021, 8:45 PM EDT
In force: 34 min
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Decatur County, IN, Shelby County, IN

The radar

The Indianapolis radar (KIND), 68 km from the middle of the area, began a volume at 00:13 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
Jul 29, 8:14 PM EDT	TORNADO	2 S Waldron, IN	NWS STORM SURVEY CONFIRMED AN EF1 TORNADO WITH MAX WIND SPEED OF 90 MPH AND A PATH LENGTH OF 0.71 MILES. THE MAX WIDTH WAS 50 YARDS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 0.2 hours before the alert went out and 154 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: 2113 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 691 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 9.2

Open this sounding in Storm Lab

The text

As transmitted.

923 
WUUS53 KIND 300011
SVRIND
INC031-145-300045-
/O.NEW.KIND.SV.W.0058.210730T0011Z-210730T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Indianapolis IN
811 PM EDT Thu Jul 29 2021

The National Weather Service in Indianapolis has issued a

* Severe Thunderstorm Warning for...
  Southeastern Shelby County in central Indiana...
  Northwestern Decatur County in central Indiana...

* Until 845 PM EDT.

* At 811 PM EDT, a severe thunderstorm was located 8 miles southeast
  of Shelbyville, moving southeast at 15 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  St. Paul around 820 PM EDT.

Other locations in the path of this severe thunderstorm include
Milford, Adams, Greensburg and Sandusky.

This includes Interstate 74 between mile markers 119 and 135.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3926 8558 3945 8577 3953 8566 3947 8563
      3945 8563 3945 8550 3939 8540
TIME...MOT...LOC 0011Z 310DEG 14KT 3944 8567 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

cp

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 8:14 PM EDT	Tornado Warning	IND	Decatur, Rush, Shelby	31 min
Jul 29, 8:45 PM EDT	Severe Thunderstorm Warning	IND	Decatur, Shelby	45 min
Jul 29, 9:06 PM EDT	Special Weather Statement	IND	Knox	39 min
Jul 29, 9:30 PM EDT	Severe Thunderstorm Warning	IND	Bartholomew, Decatur, Shelby	45 min
Jul 29, 9:37 PM EDT	Areal Flood Advisory	IND	Bartholomew, Decatur, Shelby	5 hr
Jul 29, 10:14 PM EDT	Severe Thunderstorm Warning	IND	Bartholomew, Decatur, Shelby	21 min
Jul 29, 10:24 PM EDT	Flash Flood Warning	IND	Bartholomew, Decatur, Shelby	3 hr
Jul 30, 1:13 AM EDT	Areal Flood Warning	IND	Bartholomew, Decatur, Shelby	6 hr
Jul 30, 3:42 AM EDT	River Flood Warning	IND	Bartholomew	8 hr

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.