Alert archive / Tennessee / Tornado Warnings in 2017

Tornado Warning 38, NWS Nashville, TN

August 31, 2017Davidson County, Tennessee

NWS Nashville, TN issued this tornado warning at Aug 31, 2017, 5:57 PM CDT for Davidson County, Tennessee. It was in force for 33 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: Aug 31, 2017, 5:57 PM CDT (22:57 UTC)
Expired: Aug 31, 2017, 6:30 PM CDT
In force: 33 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Davidson County, TN

The radar

The Nashville radar (KOHX), 19 km from the middle of the area, began a volume at 22:57 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
Aug 31, 5:58 PM CDT	TSTM WND DMG	4 Nne Nashville, TN	TREE AND POWER LINE DOWN ON MAPLE PLACE

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

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 11.0 hours before the alert went out and 20 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: 198 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 462 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

869 
WFUS54 KOHX 312257
TOROHX
TNC037-312330-
/O.NEW.KOHX.TO.W.0038.170831T2257Z-170831T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Nashville TN
557 PM CDT THU AUG 31 2017

The National Weather Service in Nashville has issued a

* Tornado Warning for...
  Northwestern Davidson County in Middle Tennessee...

* Until 630 PM CDT
    
* At 556 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Nashville, moving northwest at 15 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  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...
  Joelton around 625 PM CDT. 

Other locations impacted by this tornadic thunderstorm include Beaman
Park and Whites Creek.

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 3621 8669 3617 8676 3626 8696 3636 8679
TIME...MOT...LOC 2256Z 132DEG 15KT 3622 8678 

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

$$

Whitehead

1 follow-up statement

812 
WWUS54 KOHX 312320
SVSOHX

Severe Weather Statement
National Weather Service Nashville TN
620 PM CDT THU AUG 31 2017

TNC037-312330-
/O.CON.KOHX.TO.W.0038.000000T0000Z-170831T2330Z/
Davidson TN-
620 PM CDT THU AUG 31 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM CDT FOR NORTH
CENTRAL DAVIDSON COUNTY...
    
At 619 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Madison, or 7 miles north of Nashville, moving north
at 15 mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

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. 

Locations impacted include...
Joelton and Whites Creek. 

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 3624 8671 3620 8680 3631 8688 3636 8679
TIME...MOT...LOC 2319Z 175DEG 11KT 3629 8677 

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

$$

Whitehead

The office that day

Everything else NWS Nashville, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 31, 4:24 PM CDT	Tornado Warning	OHX	Lawrence, Wayne	21 min
Aug 31, 4:26 PM CDT	Tornado Warning	OHX	Perry	19 min
Aug 31, 4:43 PM CDT	Tornado Warning	OHX	Lawrence, Lewis, Maury	32 min
Aug 31, 5:13 PM CDT	Tornado Warning	OHX	Lewis, Maury	32 min
Aug 31, 5:44 PM CDT	Tornado Warning	OHX	Hickman, Lewis, Maury	31 min
Aug 31, 6:17 PM CDT	Areal Flood Advisory	OHX	Davidson	118 min
Aug 31, 6:37 PM CDT	Flash Flood Warning	OHX	Davidson, Robertson	7 hr
Aug 31, 6:44 PM CDT	Tornado Warning	OHX	Davidson, Robertson	16 min

Nearby

Tornado Warnings in Tennessee, 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.