Alert archive / Indiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 20, NWS Indianapolis, IN

June 18, 20214 counties in Indiana

NWS Indianapolis, IN issued this severe thunderstorm warning at Jun 18, 2021, 7:45 PM EDT for 4 counties in Indiana. It was in force for 45 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: Jun 18, 2021, 7:45 PM EDT (23:45 UTC)
Expired: Jun 18, 2021, 8:30 PM EDT
In force: 45 min
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Brown County, IN, Monroe County, IN, Morgan County, IN, Owen County, IN

The radar

The Indianapolis radar (KIND), 41 km from the middle of the area, began a volume at 23:45 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
Jun 18, 8:13 PM EDT	TSTM WND DMG	1 Wnw Paragon, IN	LARGE TREE DOWN AND FELL ON DECK. REPORTS OF OTHER TREES DOWN NEARBY. TIME ESTIMATED FROM RADAR.
Jun 18, 8:40 PM EDT	HAIL 1	Lake Lemon, IN

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
Jun 18, 6:23 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.8 hours before the alert went out and 190 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: 1125 J/kg
Mixed-layer CIN: -257 J/kg
Mixed-layer LCL: 1976 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 251 m²/s²
0-3 km storm-relative helicity: 269 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

337 
WUUS53 KIND 182345
SVRIND
INC013-105-109-119-190030-
/O.NEW.KIND.SV.W.0020.210618T2345Z-210619T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Indianapolis IN
745 PM EDT Fri Jun 18 2021

The National Weather Service in Indianapolis has issued a

* Severe Thunderstorm Warning for...
  Northern Monroe County in south central Indiana...
  Southern Morgan County in central Indiana...
  Northwestern Brown County in south central Indiana...
  Northeastern Owen County in west central Indiana...

* Until 830 PM EDT.

* At 745 PM EDT, a severe thunderstorm was located 11 miles west of
  Martinsville, or 21 miles north of Bloomington, moving southeast at
  30 mph.

  HAZARD...Golf ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Paragon around 755 PM EDT.
  Martinsville around 805 PM EDT.

Other locations in the path of this severe thunderstorm include
Mahalasville, Lake Lemon and Morgantown.

This includes Interstate 70 near mile marker 50.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3938 8678 3947 8672 3947 8669 3951 8669
      3955 8666 3957 8665 3944 8625 3937 8625
      3912 8643
TIME...MOT...LOC 2345Z 300DEG 26KT 3947 8663 

HAIL...1.75IN
WIND...60MPH
 
$$

TDUD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 9:38 AM EDT	Special Weather Statement	IND	Henry	37 min
Jun 18, 2:10 PM EDT	Special Weather Statement	IND	Carroll	35 min
Jun 18, 2:48 PM EDT	Flash Flood Watch	IND	Bartholomew, Boone, Brown, Clay, Decatur, Delaware and 21 more	19 hr
Jun 18, 3:27 PM EDT	Severe Thunderstorm Warning	IND	Delaware, Henry, Randolph	33 min
Jun 18, 4:26 PM EDT	Severe Thunderstorm Warning	IND	Delaware, Randolph	34 min
Jun 18, 5:04 PM EDT	Severe Thunderstorm Warning	IND	Randolph	26 min
Jun 18, 6:42 PM EDT	Severe Thunderstorm Warning	IND	Hamilton, Hancock, Marion	33 min
Jun 18, 6:53 PM EDT	Severe Thunderstorm Warning	IND	Randolph	37 min
Jun 18, 6:55 PM EDT	Severe Thunderstorm Warning	IND	Clay, Morgan, Owen, Putnam	50 min
Jun 18, 7:15 PM EDT	Severe Thunderstorm Warning	IND	Hancock, Henry, Madison, Marion, Rush	60 min
Jun 18, 7:31 PM EDT	Severe Thunderstorm Warning	IND	Hancock, Marion, Rush, Shelby	44 min
Jun 18, 7:56 PM EDT	Tornado Warning	IND	Shelby	13 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.