Alert archive / Indiana / Tornado Warnings in 2017

Tornado Warning 13, NWS Indianapolis, IN

May 20, 2017Boone County, Clinton County, Indiana

NWS Indianapolis, IN issued this tornado warning at May 20, 2017, 7:39 PM EDT for Boone County, Clinton County, Indiana. It was in force for 21 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: May 20, 2017, 7:39 PM EDT (23:39 UTC)
Expired: May 20, 2017, 8:00 PM EDT
In force: 21 min
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Boone County, IN, Clinton County, IN

The radar

The Indianapolis radar (KIND), 58 km from the middle of the area, began a volume at 23:41 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
May 20, 7:47 PM EDT	TORNADO	3 N Thorntown, IN	POSSIBLE TORNADO.

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 12:00Z, 11.7 hours before the alert went out and 169 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 734 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 347 m²/s²
0-3 km storm-relative helicity: 347 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

902 
WFUS53 KIND 202339
TORIND
INC011-023-210000-
/O.NEW.KIND.TO.W.0013.170520T2339Z-170521T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Indianapolis IN
739 PM EDT SAT MAY 20 2017

The National Weather Service in Indianapolis has issued a

* Tornado Warning for...
  Southwestern Clinton County in central Indiana...
  Northwestern Boone County in central Indiana...

* Until 800 PM EDT

* At 739 PM EDT, a severe thunderstorm capable of producing a tornado
  was located 12 miles northwest of Lebanon, or 12 miles northeast of
  Crawfordsville, moving northeast at 20 mph.

  HAZARD...Tornado. 

  SOURCE...Weather spotters reported funnel cloud. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Thorntown and Colfax around 750 PM EDT. 

This includes Interstate 65 between mile markers 149 and 155.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4019 8647 4009 8668 4011 8670 4017 8670
      4024 8665
TIME...MOT...LOC 2339Z 234DEG 16KT 4012 8669 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

PUMA

1 follow-up statement

255 
WWUS53 KIND 202349
SVSIND

Severe Weather Statement
National Weather Service Indianapolis IN
749 PM EDT SAT MAY 20 2017

INC011-023-210000-
/O.CON.KIND.TO.W.0013.000000T0000Z-170521T0000Z/
Clinton IN-Boone IN-
749 PM EDT SAT MAY 20 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM EDT FOR
SOUTHWESTERN CLINTON AND NORTHWESTERN BOONE COUNTIES...
        
At 749 PM EDT, a severe thunderstorm capable of producing a tornado
was located 10 miles southwest of Frankfort, moving northeast at 20
mph.

HAZARD...Tornado and quarter size hail. 

SOURCE...Weather spotters reported a funnel cloud. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This tornadic thunderstorm will remain over mainly rural areas of
southwestern Clinton and northwestern Boone Counties.

This includes Interstate 65 between mile markers 149 and 154.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4019 8647 4011 8665 4013 8668 4016 8668
      4023 8662
TIME...MOT...LOC 2349Z 234DEG 16KT 4017 8664 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

PUMA

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 7:30 PM EDT	Severe Thunderstorm Warning	IND	Boone, Clinton, Montgomery	45 min
May 20, 7:55 PM EDT	Tornado Warning	IND	Clinton	35 min

Nearby

Tornado Warnings in Indiana, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.