Alert archive / Tennessee / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 15, NWS Nashville, TN

January 11, 2020DeKalb County, Smith County, Wilson County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Jan 11, 2020, 10:43 AM CST for DeKalb County, Smith County, Wilson County, Tennessee. It was in force for 32 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: Jan 11, 2020, 10:43 AM CST (16:43 UTC)
Expired: Jan 11, 2020, 11:15 AM CST
In force: 32 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties DeKalb County, TN, Smith County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 56 km from the middle of the area, began a volume at 16:47 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
Jan 11, 10:45 AM CST	TSTM WND DMG	4 N Auburntown, TN	TREES DOWN ALONG 9000 BLOCK OF STATESVILLE ROAD

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 2 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jan 11, 6:57 AM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 4.7 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: 819 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 633 m²/s²
0-3 km storm-relative helicity: 864 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

273 
WUUS54 KOHX 111643
SVROHX
TNC041-159-189-111715-
/O.NEW.KOHX.SV.W.0015.200111T1643Z-200111T1715Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Nashville TN
1043 AM CST Sat Jan 11 2020

The National Weather Service in Nashville has issued a

* Severe Thunderstorm Warning for...
  Southeastern Smith County in Middle Tennessee...
  Northwestern De Kalb County in Middle Tennessee...
  Southeastern Wilson County in Middle Tennessee...

* Until 1115 AM CST.

* At 1043 AM CST, a severe thunderstorm was located 7 miles south of
  Watertown, or 12 miles north of Woodbury, moving east at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Alexandria, Dowelltown, Liberty and Center Hill Lake. 

This includes Interstate 40 between mile markers 263 and 266.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 100 PM CST for Middle
Tennessee.

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

&&

LAT...LON 3618 8581 3597 8582 3596 8605 3596 8608
      3597 8609 3596 8610 3596 8616 3606 8613
TIME...MOT...LOC 1643Z 255DEG 31KT 3599 8612 

HAIL...<.75IN
WIND...60MPH
 
$$

Whitehead

2 follow-up statements

713 
WWUS54 KOHX 111656
SVSOHX

Severe Weather Statement
National Weather Service Nashville TN
1056 AM CST Sat Jan 11 2020

TNC189-111705-
/O.CAN.KOHX.SV.W.0015.000000T0000Z-200111T1715Z/
Wilson TN-
1056 AM CST Sat Jan 11 2020

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

A Tornado Watch remains in effect until 100 PM CST for Middle
Tennessee.

LAT...LON 3618 8581 3597 8582 3596 8602 3597 8602
      3611 8600
TIME...MOT...LOC 1655Z 255DEG 31KT 3602 8599 

$$

TNC041-159-111715-
/O.CON.KOHX.SV.W.0015.000000T0000Z-200111T1715Z/
Smith TN-De Kalb TN-
1056 AM CST Sat Jan 11 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 AM CST
FOR SOUTHEASTERN SMITH AND NORTHWESTERN DE KALB COUNTIES...

At 1055 AM CST, a severe thunderstorm was located 10 miles southeast
of Watertown, or 10 miles northwest of Smithville, moving east at 35
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Dowelltown, Liberty and Center Hill Lake. 

This includes Interstate 40 between mile markers 263 and 266.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 100 PM CST for Middle
Tennessee.

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

&&

LAT...LON 3618 8581 3597 8582 3596 8602 3597 8602
      3611 8600
TIME...MOT...LOC 1655Z 255DEG 31KT 3602 8599 

HAIL...<.75IN
WIND...60MPH
 
$$

Whitehead

130 
WWUS54 KOHX 111707
SVSOHX

Severe Weather Statement
National Weather Service Nashville TN
1107 AM CST Sat Jan 11 2020

TNC041-159-111717-
/O.EXP.KOHX.SV.W.0015.000000T0000Z-200111T1715Z/
Smith TN-De Kalb TN-
1107 AM CST Sat Jan 11 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SMITH AND
NORTHWESTERN DE KALB COUNTIES WILL EXPIRE AT 1115 AM CST...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 100 PM CST for Middle
Tennessee.

LAT...LON 3618 8581 3597 8582 3596 8602 3597 8602
      3611 8600
TIME...MOT...LOC 1707Z 255DEG 31KT 3604 8588 

$$

Whitehead

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Nashville, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jan 11, 6:26 AM CST, 4 hours 17 minutes earlier.

Area forecast discussion, Jan 11, 6:26 AM CST, 4 hours 17 minutes before

Area Forecast Discussion
National Weather Service Nashville TN
626 AM CST Sat Jan 11 2020

.UPDATE...
FOR MORNING DISCUSSION.

&&

.DISCUSSION...

Updated suite of forecast products to remove early this morning
wording from zone forecast product. Tweaked hourly temperature,
dewpoint, and wind speed/direction grids. Remainder of forecast
continues to be in good shape.

&&

.AVIATION...
12Z TAF DISCUSSION.

A strong line of thunderstorms will be moving through middle TN
today. Tried to time the onset as best I could. Expect it to be
around CKV around 12-13Z BNA/MQY around 17-18Z and CSV around
20-21Z. Even before and after the line very strong gusty winds to
25-35kts are expected today. This will mean more LLWS potential.
Expect CIGs to be MVFR today and IFR/LIFR especially in the
heavier rain.

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
Wind Advisory until 6 PM CST this evening for Bedford-Cannon-
Cheatham-Clay-Coffee-Cumberland-Davidson-De Kalb-Dickson-
Fentress-Giles-Grundy-Hickman-Houston-Humphreys-Jackson-Lawrence-
Lewis-Macon-Marshall-Maury-Montgomery-Overton-Perry-Pickett-
Putnam-Robertson-Rutherford-Smith-Stewart-Sumner-Trousdale-Van
Buren-Warren-Wayne-White-Williamson-Wilson.

&&

DISCUSSION......JB Wright
AVIATION........12

Hazardous weather outlook, Jan 11, 5:23 AM CST, 5 hours 20 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
523 AM CST Sat Jan 11 2020

TNZ005>011-023>034-056>066-075-077>080-093>095-121100-
Stewart-Montgomery-Robertson-Sumner-Macon-Clay-Pickett-Houston-
Humphreys-Dickson-Cheatham-Davidson-Wilson-Trousdale-Smith-
Jackson-Putnam-Overton-Fentress-Perry-Hickman-Lewis-Williamson-
Maury-Marshall-Rutherford-Cannon-De Kalb-White-Cumberland-Bedford-
Coffee-Warren-Grundy-Van Buren-Wayne-Lawrence-Giles-
523 AM CST Sat Jan 11 2020

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...Today and Tonight

A wind advisory will continue to be in effect for all of Middle
Tennessee through the afternoon hours today. Gust to around
45 mph will be possible.

Some strong to a few severe thunderstorms will be possible
this morning through the afternoon hours. Main concerns will be
strong to damaging winds and possibly isolated tornadoes mainly
south of I-40.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed today.

Spotter Thunderstorm Reporting Criteria
Tornado
Funnel Cloud
Flooding
Hail >= 1/2 inch
Winds > 50 MPH (Measured)
Structural Damage
Trees or Power Lines Down

JB Wright

In the hours before

Local storm report, Jan 11, 9:43 AM CST, 1 hour before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
943 AM CST SAT JAN 11 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0930 AM     TSTM WND DMG     EAST NASHVILLE          36.17N  86.76W
01/11/2020                   DAVIDSON           TN   PUBLIC

            TREE DOWN ON JONES AVE

&&

EVENT NUMBER OHX2000008

21

Special weather statement, Jan 11, 9:55 AM CST, 48 minutes before

Special Weather Statement
National Weather Service Nashville TN
955 AM CST Sat Jan 11 2020

TNZ008-009-029-111630-
Trousdale TN-Sumner TN-Macon TN-
955 AM CST Sat Jan 11 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN SUMNER...
NORTHWESTERN MACON AND NORTHWESTERN TROUSDALE COUNTIES UNTIL 1030 AM
CST...

At 954 AM CST, Doppler radar was tracking a strong thunderstorm 8
miles southwest of Westmoreland, or 9 miles northeast of Gallatin,
moving northeast at 45 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Gallatin, Lafayette, Westmoreland, Oak Grove and Bethpage.

A Tornado Watch remains in effect until 100 PM CST for Middle
Tennessee.

LAT...LON 3662 8592 3653 8593 3637 8643 3660 8644
      3665 8635
TIME...MOT...LOC 1554Z 235DEG 38KT 3650 8637

Whitehead

Special weather statement, Jan 11, 10:08 AM CST, 35 minutes before

Special Weather Statement
National Weather Service Nashville TN
1008 AM CST Sat Jan 11 2020

TNZ008-009-028>030-111645-
Wilson TN-Trousdale TN-Sumner TN-Macon TN-Smith TN-
1008 AM CST Sat Jan 11 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN SMITH...SOUTHEASTERN
SUMNER...NORTH CENTRAL WILSON...SOUTHWESTERN MACON AND TROUSDALE
COUNTIES UNTIL 1045 AM CST...

At 1008 AM CST, Doppler radar was tracking a strong thunderstorm near
Gallatin, moving northeast at 55 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Gallatin, Lafayette, Hartsville, Bledsoe Creek State Park, Dickerson
Chapel Recreation Area and Dixon Springs.

A Tornado Watch remains in effect until 100 PM CST for Middle
Tennessee.

LAT...LON 3626 8642 3641 8643 3654 8601 3630 8605
TIME...MOT...LOC 1608Z 232DEG 46KT 3633 8636

Whitehead

Special weather statement, Jan 11, 10:15 AM CST, 28 minutes before

Special Weather Statement
National Weather Service Nashville TN
1015 AM CST Sat Jan 11 2020

TNZ028-062-111645-
Rutherford TN-Wilson TN-
1015 AM CST Sat Jan 11 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN RUTHERFORD AND
SOUTHEASTERN WILSON COUNTIES UNTIL 1045 AM CST...

At 1015 AM CST, Doppler radar was tracking a strong thunderstorm near
Walterhill, or 11 miles south of Lebanon, moving east at 35 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Lebanon, Watertown, Walterhill, Auburntown and Cedars Of Lebanon
State Park.

A Tornado Watch remains in effect until 100 PM CST for Middle
Tennessee.

LAT...LON 3620 8609 3619 8610 3614 8608 3612 8607
      3607 8606 3607 8605 3596 8605 3596 8608
      3597 8609 3596 8610 3596 8615 3595 8615
      3596 8642 3616 8640 3620 8613
TIME...MOT...LOC 1615Z 260DEG 32KT 3605 8637

Whitehead

Local storm report, Jan 11, 10:35 AM CST, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
1035 AM CST SAT JAN 11 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1020 AM     NON-TSTM WND DMG MCMINNVILLE             35.69N  85.78W
01/11/2020                   WARREN             TN   TRAINED SPOTTER

            BUILDING LOST SOME OF ITS ROOFING

&&

EVENT NUMBER OHX2000009

SCHAPER

Special weather statement, Jan 11, 10:38 AM CST, 5 minutes before

Special Weather Statement
National Weather Service Nashville TN
1038 AM CST Sat Jan 11 2020

TNZ009-010-028>032-111715-
Putnam TN-Wilson TN-Trousdale TN-Clay TN-Jackson TN-Macon TN-
Smith TN-
1038 AM CST Sat Jan 11 2020

...SIGNIFICANT WEATHER ADVISORY FOR SMITH...WESTERN JACKSON...EAST
CENTRAL WILSON...WEST CENTRAL CLAY...SOUTHEASTERN MACON...EAST
CENTRAL TROUSDALE AND WEST CENTRAL PUTNAM COUNTIES UNTIL 1115 AM
CST...

At 1038 AM CST, Doppler radar was tracking strong thunderstorms along
a line extending from near Hartsville to near Watertown. Movement was
east at 40 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Carthage, Gainesboro, Watertown, Gordonsville, Hickman, South
Carthage, Whitleyville, Dixon Springs, Granville and Pleasant Shade.

A Tornado Watch remains in effect until 100 PM CST for Middle
Tennessee.

LAT...LON 3611 8567 3610 8579 3613 8581 3612 8583
      3613 8584 3610 8586 3610 8588 3611 8590
      3612 8591 3610 8591 3611 8593 3610 8595
      3611 8596 3609 8599 3609 8606 3608 8613
      3641 8609 3655 8566
TIME...MOT...LOC 1638Z 255DEG 34KT 3635 8608 3613 8610

Whitehead

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 11, 6:54 AM CST	Severe Thunderstorm Warning	OHX	Dickson, Houston, Humphreys, Montgomery, Stewart	51 min
Jan 11, 7:09 AM CST	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Humphreys, Lewis, Perry, Wayne	36 min
Jan 11, 7:29 AM CST	Tornado Warning	OHX	Humphreys	15 min
Jan 11, 7:37 AM CST	Severe Thunderstorm Warning	OHX	Lawrence, Wayne	38 min
Jan 11, 7:40 AM CST	Severe Thunderstorm Warning	OHX	Cheatham, Dickson, Houston, Humphreys, Montgomery, Robertson and 1 more	50 min
Jan 11, 7:42 AM CST	Severe Thunderstorm Warning	OHX	Cheatham, Dickson, Hickman, Humphreys, Lewis, Perry and 2 more	48 min
Jan 11, 8:06 AM CST	Severe Thunderstorm Warning	OHX	Hickman, Lawrence, Lewis, Maury, Perry, Wayne	39 min
Jan 11, 8:25 AM CST	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Robertson, Sumner, Williamson	22 min
Jan 11, 8:42 AM CST	Severe Thunderstorm Warning	OHX	Giles, Lawrence, Lewis, Maury	33 min
Jan 11, 8:53 AM CST	Severe Thunderstorm Warning	OHX	Davidson, Hickman, Maury, Williamson	37 min
Jan 11, 9:07 AM CST	Flash Flood Warning	OHX	Lawrence	3 hr
Jan 11, 9:11 AM CST	Severe Thunderstorm Warning	OHX	Giles, Lawrence, Marshall, Maury, Williamson	34 min
Jan 11, 9:22 AM CST	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Williamson, Wilson	38 min
Jan 11, 9:29 AM CST	Severe Thunderstorm Warning	OHX	Davidson, Sumner, Wilson	31 min
Jan 11, 9:43 AM CST	Severe Thunderstorm Warning	OHX	Giles, Marshall, Maury, Rutherford, Williamson	32 min
Jan 11, 9:55 AM CST	Special Weather Statement	OHX	Macon	35 min
Jan 11, 10:08 AM CST	Special Weather Statement	OHX	Trousdale	37 min
Jan 11, 10:15 AM CST	Special Weather Statement	OHX	Wilson	30 min
Jan 11, 10:20 AM CST	Severe Thunderstorm Warning	OHX	Smith, Wilson	25 min
Jan 11, 10:38 AM CST	Special Weather Statement	OHX	Jackson, Smith	37 min
Jan 11, 10:47 AM CST	Severe Thunderstorm Warning	OHX	Clay, Jackson, Macon, Smith	28 min
Jan 11, 11:11 AM CST	Severe Thunderstorm Warning	OHX	Clay, Jackson, Overton	34 min
Jan 11, 11:35 AM CST	Special Weather Statement	OHX	Pickett	25 min
Jan 11, 12:02 PM CST	Areal Flood Advisory	OHX	Bedford, Giles, Lawrence, Lewis, Marshall, Maury and 1 more	5 hr
Jan 11, 1:05 PM CST	Special Weather Statement	OHX	DeKalb	25 min
Jan 11, 1:11 PM CST	Special Weather Statement	OHX	DeKalb	34 min
Jan 11, 2:02 PM CST	Severe Thunderstorm Warning	OHX	Grundy, Van Buren, Warren	28 min
Jan 11, 2:10 PM CST	Special Weather Statement	OHX	Fentress, Pickett	50 min
Jan 11, 3:16 PM CST	Special Weather Statement	OHX	Cumberland	29 min
Jan 11, 3:32 PM CST	Severe Thunderstorm Warning	OHX	Cumberland	18 min
Jan 11, 4:09 PM CST	River Flood Advisory	OHX	Lawrence	9 hr
Jan 11, 4:21 PM CST	River Flood Advisory	OHX	Davidson	4 hr
Jan 11, 4:32 PM CST	River Flood Advisory	OHX	Giles	35 hr
Jan 11, 4:37 PM CST	River Flood Advisory	OHX	Hickman	12 hr
Jan 11, 4:40 PM CST	River Flood Advisory	OHX	Cheatham	7 hr
Jan 11, 4:43 PM CST	River Flood Advisory	OHX	Montgomery, Robertson	27 hr
Jan 11, 5:19 PM CST	Special Weather Statement	OHX	Cheatham, Robertson, Sumner	41 min
Jan 11, 5:36 PM CST	Special Weather Statement	OHX	Williamson, Wilson	39 min
Jan 11, 5:43 PM CST	Severe Thunderstorm Warning	OHX	Macon, Robertson, Sumner	47 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2020 Every severe thunderstorm warning in 2020

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.