Alert archive / Indiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 85, NWS Indianapolis, IN

October 11, 2021Boone County, Clinton County, Indiana

NWS Indianapolis, IN issued this severe thunderstorm warning at Oct 11, 2021, 9:10 PM EDT for Boone County, Clinton County, Indiana. It was in force for 35 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: Oct 11, 2021, 9:10 PM EDT (01:10 UTC)
Expired: Oct 11, 2021, 9:45 PM EDT
In force: 35 min
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Boone County, IN, Clinton County, IN

The radar

The Indianapolis radar (KIND), 63 km from the middle of the area, began a volume at 01:09 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
Oct 11, 9:24 PM EDT	TSTM WND DMG	Frankfort, IN	1 TREE DOWNED WITH SEVERAL LARGE TREE LIMBS ALSO DOWNED WITHIN THE CITY LIMITS. DELAYED REPORT AND TIME ESTIMATED FROM RADAR.

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 00:00Z, 1.2 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: 10 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 743 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -150 m²/s²
0-3 km storm-relative helicity: -158 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

626 
WUUS53 KIND 120110
SVRIND
INC011-023-120145-
/O.NEW.KIND.SV.W.0085.211012T0110Z-211012T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Indianapolis IN
910 PM EDT Mon Oct 11 2021

The National Weather Service in Indianapolis has issued a

* Severe Thunderstorm Warning for...
  Western Clinton County in central Indiana...
  Northwestern Boone County in central Indiana...

* Until 945 PM EDT.

* At 910 PM EDT, a line of showers was located 10 miles southwest of 
  Frankfort, moving north at 35 mph. A weak tornado is possible 
  along this short line.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Frankfort around 925 PM EDT.
  Mulberry around 930 PM EDT.

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

This includes Interstate 65 between mile markers 146 and 158.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4014 8647 4007 8666 4043 8666 4043 8641
TIME...MOT...LOC 0110Z 198DEG 29KT 4016 8662 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

AW

1 follow-up statement

101 
WWUS53 KIND 120120
SVSIND

Severe Weather Statement
National Weather Service Indianapolis IN
920 PM EDT Mon Oct 11 2021

INC011-120130-
/O.CAN.KIND.SV.W.0085.000000T0000Z-211012T0145Z/
Boone IN-
920 PM EDT Mon Oct 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BOONE COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4018 8646 4019 8658 4043 8661 4043 8641
TIME...MOT...LOC 0120Z 198DEG 29KT 4024 8659 

$$

INC023-120145-
/O.CON.KIND.SV.W.0085.000000T0000Z-211012T0145Z/
Clinton IN-
920 PM EDT Mon Oct 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT
FOR CENTRAL CLINTON COUNTY...

At 920 PM EDT, a severe thunderstorm was located near Frankfort,
moving north at 35 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

This severe storm will be near...
  Frankfort around 925 PM EDT.

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

This includes Interstate 65 between mile markers 151 and 152.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4018 8646 4019 8658 4043 8661 4043 8641
TIME...MOT...LOC 0120Z 198DEG 29KT 4024 8659 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

AW

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 11, 9:18 PM EDT	Tornado Warning	IND	Clinton	27 min
Oct 11, 9:30 PM EDT	Severe Thunderstorm Warning	IND	Carroll	30 min
Oct 11, 9:37 PM EDT	Tornado Warning	IND	Carroll, Clinton, Howard	26 min
Oct 11, 10:34 PM EDT	Special Weather Statement	IND	Bartholomew	26 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.