Alert archive / Tennessee / Tornado Warnings in 2017

Tornado Warning 45, NWS Nashville, TN

November 18, 2017Macon County, Smith County, Trousdale County, Tennessee

NWS Nashville, TN issued this tornado warning at Nov 18, 2017, 5:07 PM CST for Macon County, Smith County, Trousdale County, Tennessee. It was in force for 11 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: Nov 18, 2017, 5:07 PM CST (23:07 UTC)
Expired: Nov 18, 2017, 5:18 PM CST
In force: 11 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Macon County, TN, Smith County, TN, Trousdale County, TN

The radar

The Nashville radar (KOHX), 45 km from the middle of the area, began a volume at 23:07 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
Nov 18, 5:07 PM CST	TSTM WND DMG	2 Nw Hartsville, TN	TREES AND POWER LINES DOWN WITH ROOF DAMAGE TO A HOME ON SLEEPY HOLLOW LANE. POSSIBLE TORNADO.
Nov 18, 5:09 PM CST	TSTM WND DMG	2 Nnw Hartsville, TN	TSPOTTER REPORT OF ROOF SHINGLES AND SIDING BLOWN OFF A HOME AND A TREE DOWN AT 245 BRIDLE PATH LANE. POSSIBLE TORNADO.

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
Nov 18, 12:35 PM CST	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 11.1 hours before the alert went out and 55 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: 858 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 559 m²/s²
0-3 km storm-relative helicity: 544 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

547 
WFUS54 KOHX 182307
TOROHX
TNC111-159-169-182330-
/O.NEW.KOHX.TO.W.0045.171118T2307Z-171118T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Nashville TN
507 PM CST SAT NOV 18 2017

The National Weather Service in Nashville has issued a

* Tornado Warning for...
  North central Smith County in Middle Tennessee...
  Southern Macon County in Middle Tennessee...
  Trousdale County in Middle Tennessee...

* Until 530 PM CST
    
* At 506 PM CST, a severe thunderstorm capable of producing a tornado
  was located near Hartsville, moving east at 45 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...
  Lafayette around 525 PM CST. 

Other locations impacted by this tornadic thunderstorm include
Pleasant Shade.

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 3637 8626 3644 8626 3657 8587 3636 8587
TIME...MOT...LOC 2306Z 256DEG 40KT 3642 8621 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Shamburger

2 follow-up statements

582 
WWUS54 KOHX 182312
SVSOHX

Severe Weather Statement
National Weather Service Nashville TN
512 PM CST SAT NOV 18 2017

TNC111-159-169-182330-
/O.CON.KOHX.TO.W.0045.000000T0000Z-171118T2330Z/
Smith TN-Macon TN-Trousdale TN-
512 PM CST SAT NOV 18 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CST FOR NORTH
CENTRAL SMITH...SOUTHERN MACON AND CENTRAL TROUSDALE COUNTIES...
        
At 511 PM CST, a confirmed tornado was located just north of 
Hartsville, moving east at 50 mph.

HAZARD...Damaging tornado. 

SOURCE...Radar confirmed tornado. 

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...
Lafayette, Hartsville and Pleasant Shade. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 3657 8587 3636 8587 3637 8622 3646 8621
TIME...MOT...LOC 2311Z 258DEG 46KT 3643 8613 

TORNADO...OBSERVED
HAIL...<.75IN

$$

Shamburger

264 
WWUS54 KOHX 182318
SVSOHX

Severe Weather Statement
National Weather Service Nashville TN
518 PM CST SAT NOV 18 2017

TNC111-159-169-182327-
/O.CAN.KOHX.TO.W.0045.000000T0000Z-171118T2330Z/
Smith TN-Macon TN-Trousdale TN-
518 PM CST SAT NOV 18 2017

...THE TORNADO WARNING FOR NORTH CENTRAL SMITH...SOUTHERN MACON AND
CENTRAL TROUSDALE COUNTIES IS CANCELLED...
    
The tornado threat has diminished and the Tornado Warning has been 
cancelled. However, damaging winds remain likely and a Severe 
Thunderstorm Warning remains in effect for the area.

A severe thunderstorm watch remains in effect until 700 PM CST for
Middle Tennessee.

LAT...LON 3657 8587 3636 8587 3637 8622 3646 8621
TIME...MOT...LOC 2317Z 256DEG 40KT 3645 8604 

$$

Shamburger

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 18, 2:57 PM CST	Special Weather Statement	OHX	Houston, Humphreys, Stewart	33 min
Nov 18, 3:07 PM CST	Severe Thunderstorm Warning	OHX	Houston, Montgomery, Stewart	23 min
Nov 18, 3:14 PM CST	Severe Thunderstorm Warning	OHX	Houston, Humphreys	31 min
Nov 18, 3:24 PM CST	Tornado Warning	OHX	Houston, Humphreys	36 min
Nov 18, 3:30 PM CST	Severe Thunderstorm Warning	OHX	Dickson, Houston, Humphreys, Montgomery, Stewart	30 min
Nov 18, 3:37 PM CST	Special Weather Statement	OHX	Perry	38 min
Nov 18, 3:47 PM CST	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Humphreys, Lewis, Perry	28 min
Nov 18, 4:00 PM CST	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Hickman, Montgomery, Robertson and 1 more	30 min
Nov 18, 4:11 PM CST	Special Weather Statement	OHX	Giles, Hickman, Lawrence, Lewis, Maury, Wayne	49 min
Nov 18, 4:25 PM CST	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson, Rutherford, Sumner, Williamson and 1 more	50 min
Nov 18, 4:53 PM CST	Tornado Warning	OHX	Davidson, Rutherford, Wilson	21 min
Nov 18, 5:09 PM CST	Severe Thunderstorm Warning	OHX	Cannon, Clay, DeKalb, Jackson, Macon, Rutherford and 3 more	36 min
Nov 18, 5:30 PM CST	Tornado Warning	OHX	Cannon, Rutherford	15 min
Nov 18, 5:41 PM CST	Tornado Warning	OHX	Cannon, DeKalb	10 min
Nov 18, 5:44 PM CST	Severe Thunderstorm Warning	OHX	Clay, DeKalb, Jackson, Overton, Pickett, Putnam and 2 more	46 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.