Alert archive / Tennessee / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 21, NWS Nashville, TN

January 11, 20205 counties in Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Jan 11, 2020, 6:09 PM CST for 5 counties in Tennessee. It was in force for 36 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, 6:09 PM CST (00:09 UTC)
Expired: Jan 11, 2020, 6:45 PM CST
In force: 36 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Macon County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 56 km from the middle of the area, began a volume at 00:11 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, 6:27 PM CST	TSTM WND DMG	4 Wnw Lafayette, TN	AT LEAST 15 TREES BLOWN DOWN ON FOX RUN LANE

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 00:00Z, 0.2 hours before the alert went out and 63 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: 42 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 771 m above ground
0-6 km bulk shear: 101 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

201 
WUUS54 KOHX 120009
SVROHX
TNC111-159-165-169-189-120045-
/O.NEW.KOHX.SV.W.0021.200112T0009Z-200112T0045Z/

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

The National Weather Service in Nashville has issued a

* Severe Thunderstorm Warning for...
  Northern Smith County in Middle Tennessee...
  Southeastern Sumner County in Middle Tennessee...
  Northeastern Wilson County in Middle Tennessee...
  Southern Macon County in Middle Tennessee...
  Trousdale County in Middle Tennessee...

* Until 645 PM CST.

* At 609 PM CST, severe thunderstorms were located along a line
  extending from 6 miles southwest of Westmoreland to near Lebanon,
  moving east at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Gallatin, Lebanon, Lafayette, Carthage, Hartsville, Red Boiling
  Springs, South Carthage, Bethpage, Dixon Springs, Pleasant Shade,
  Bledsoe Creek State Park and Dickerson Chapel Recreation Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3637 8583 3634 8583 3634 8584 3629 8585
      3628 8584 3623 8584 3620 8642 3651 8643
      3655 8601 3656 8581
TIME...MOT...LOC 0009Z 255DEG 44KT 3651 8635 3625 8635 

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

27

1 follow-up statement

947 
WWUS54 KOHX 120034
SVSOHX

Severe Weather Statement
National Weather Service Nashville TN
634 PM CST Sat Jan 11 2020

TNC165-120044-
/O.CAN.KOHX.SV.W.0021.000000T0000Z-200112T0045Z/
Sumner TN-
634 PM CST Sat Jan 11 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SUMNER COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 3656 8581 3637 8583 3634 8583 3634 8584
      3629 8585 3628 8584 3623 8584 3621 8630
      3649 8623 3650 8622 3653 8622
TIME...MOT...LOC 0034Z 255DEG 44KT 3659 8598 3633 8598 

$$

TNC111-159-169-189-120045-
/O.CON.KOHX.SV.W.0021.000000T0000Z-200112T0045Z/
Smith TN-Wilson TN-Macon TN-Trousdale TN-
634 PM CST Sat Jan 11 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CST
FOR NORTHERN SMITH...NORTHEASTERN WILSON...SOUTHERN MACON AND
TROUSDALE COUNTIES...

At 634 PM CST, severe thunderstorms were located along a line
extending from near Lafayette to near Carthage, moving east at 50
mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Lafayette, Carthage, Hartsville, Red Boiling Springs, South Carthage,
Dixon Springs, Pleasant Shade and Dickerson Chapel Recreation Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3656 8581 3637 8583 3634 8583 3634 8584
      3629 8585 3628 8584 3623 8584 3621 8630
      3649 8623 3650 8622 3653 8622
TIME...MOT...LOC 0034Z 255DEG 44KT 3659 8598 3633 8598 

HAIL...<.75IN
WIND...70MPH
 
$$

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 11, 6:12 PM CST	Special Weather Statement	OHX	Wilson	48 min
Jan 11, 6:20 PM CST	Severe Thunderstorm Warning	OHX	Cannon, DeKalb, Rutherford, Smith, Wilson	40 min
Jan 11, 6:26 PM CST	Severe Thunderstorm Warning	OHX	Macon	34 min
Jan 11, 6:42 PM CST	Severe Thunderstorm Warning	OHX	Clay, Jackson, Macon, Smith, Trousdale	48 min
Jan 11, 6:55 PM CST	Severe Thunderstorm Warning	OHX	DeKalb, Jackson, Overton, Putnam, Smith	35 min
Jan 11, 7:29 PM CST	Special Weather Statement	OHX	Clay, Overton, Putnam	46 min
Jan 11, 7:50 PM CST	Special Weather Statement	OHX	Cumberland, Fentress, Pickett	40 min
Jan 11, 7:53 PM CST	River Flood Advisory	OHX	Perry	51 hr
Jan 12, 1:35 AM CST	River Flood Warning	OHX	Lawrence	5 hr
Jan 12, 4:35 AM CST	River Flood Advisory	OHX	Hickman	46 hr
Jan 12, 6:17 AM CST	River Flood Advisory	OHX	Lawrence	4 hr
Jan 12, 2:32 PM CST	River Flood Advisory	OHX	Davidson	8 days
Jan 12, 2:38 PM CST	River Flood Advisory	OHX	Sumner, Trousdale, Wilson	31 hr
Jan 12, 3:31 PM CST	River Flood Advisory	OHX	Humphreys	45 hr

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.