Alert archive / Tennessee / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 9, NWS Nashville, TN

February 28, 20214 counties in Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Feb 28, 2021, 7:15 PM CST for 4 counties in Tennessee. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Feb 28, 2021, 7:15 PM CST (01:15 UTC)
Expired: Feb 28, 2021, 7:45 PM CST
In force: 30 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Macon County, TN, Robertson County, TN, Sumner County, TN, Trousdale County, TN

The radar

The Nashville radar (KOHX), 39 km from the middle of the area, began a volume at 01:17 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Feb 28, 2:22 PM CST	Tornado Watch	SPC	8 hr
Feb 28, 7:11 PM CST	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 1.3 hours before the alert went out and 51 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: 419 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 979 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 278 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.5

Open this sounding in Storm Lab

The text

As transmitted.

636 
WUUS54 KOHX 010115
SVROHX
TNC111-147-165-169-010145-
/O.NEW.KOHX.SV.W.0009.210301T0115Z-210301T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Nashville TN
715 PM CST Sun Feb 28 2021

The National Weather Service in Nashville has issued a

* Severe Thunderstorm Warning for...
  Sumner County in Middle Tennessee...
  Macon County in Middle Tennessee...
  Northern Trousdale County in Middle Tennessee...
  Southeastern Robertson County in Middle Tennessee...

* Until 745 PM CST.

* At 715 PM CST, severe thunderstorms were located along a line
  extending from near Westmoreland to near Gallatin to Millersville,
  moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Gallatin, Springfield, Lafayette, Hartsville, White House,
  Millersville, Greenbrier, Westmoreland, Ridgetop, Cross Plains,
  Portland, Orlinda, Mitchellville, Bethpage, Oak Grove, Bledsoe
  Creek State Park and Cottontown.

This includes Interstate 65 between mile markers 103 and 120.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CST for Middle
Tennessee.

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3662 8585 3649 8588 3636 8618 3641 8686
      3647 8692 3665 8651
TIME...MOT...LOC 0115Z 263DEG 40KT 3662 8624 3644 8645 3637 8672 

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

13

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 6:01 PM CST	Severe Thunderstorm Warning	OHX	Dickson, Houston, Montgomery	29 min
Feb 28, 6:23 PM CST	Special Weather Statement	OHX	Cheatham	37 min
Feb 28, 6:25 PM CST	Special Weather Statement	OHX	Houston, Humphreys	35 min
Feb 28, 6:30 PM CST	Severe Thunderstorm Warning	OHX	Cheatham, Montgomery, Robertson	30 min
Feb 28, 6:40 PM CST	Severe Thunderstorm Warning	OHX	Dickson, Houston, Humphreys, Montgomery	35 min
Feb 28, 6:42 PM CST	Flash Flood Warning	OHX	Cheatham, Davidson, Dickson, Houston, Humphreys, Montgomery and 2 more	5 hr
Feb 28, 6:47 PM CST	Tornado Warning	OHX	Dickson, Humphreys	13 min
Feb 28, 6:48 PM CST	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson, Sumner	42 min
Feb 28, 7:06 PM CST	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Montgomery, Robertson	24 min
Feb 28, 7:24 PM CST	Flash Flood Warning	OHX	Dickson, Hickman, Humphreys, Perry	3 hr
Feb 28, 7:26 PM CST	Flash Flood Warning	OHX	Cheatham, Davidson, Macon, Smith, Sumner, Trousdale and 2 more	4 hr
Feb 28, 7:32 PM CST	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson, Sumner, Williamson, Wilson	43 min
Feb 28, 7:39 PM CST	Severe Thunderstorm Warning	OHX	Clay, Jackson, Macon	36 min
Feb 28, 8:05 PM CST	Severe Thunderstorm Warning	OHX	Smith, Sumner, Trousdale, Wilson	25 min
Feb 28, 8:16 PM CST	Flash Flood Warning	OHX	Clay, Jackson, Overton, Pickett	3 hr
Feb 28, 8:22 PM CST	Special Weather Statement	OHX	Rutherford, Wilson	23 min
Feb 28, 8:23 PM CST	Flash Flood Warning	OHX	Davidson, Maury, Rutherford, Smith, Williamson, Wilson	3 hr
Feb 28, 8:39 PM CST	Special Weather Statement	OHX	Fentress, Overton, Pickett, Putnam	36 min
Feb 28, 8:44 PM CST	River Flood Advisory	OHX	Cheatham, Montgomery	3 days
Feb 28, 9:35 PM CST	River Flood Advisory	OHX	Davidson, Sumner, Wilson	22 days
Feb 28, 9:38 PM CST	River Flood Advisory	OHX	Houston, Montgomery, Stewart	8 hr
Feb 28, 9:54 PM CST	Special Weather Statement	OHX	Bedford, Coffee	66 min
Feb 28, 11:05 PM CST	River Flood Advisory	OHX	Cheatham	3 hr
Feb 28, 11:09 PM CST	Areal Flood Advisory	OHX	Houston, Humphreys, Montgomery, Robertson, Stewart	3 hr
Feb 28, 11:55 PM CST	Areal Flood Advisory	OHX	Cheatham, Davidson, Dickson, Houston, Humphreys, Montgomery and 2 more	3 hr
Mar 1, 12:17 AM CST	River Flood Advisory	OHX	Hickman	26 hr
Mar 1, 12:17 AM CST	River Flood Advisory	OHX	Humphreys	4 days
Mar 1, 12:17 AM CST	River Flood Advisory	OHX	Perry	44 hr
Mar 1, 12:17 AM CST	River Flood Advisory	OHX	Montgomery, Robertson	4 hr
Mar 1, 12:43 AM CST	River Flood Advisory	OHX	Davidson	115 min
Mar 1, 2:13 AM CST	River Flood Advisory	OHX	Cheatham	7 hr
Mar 1, 2:15 AM CST	River Flood Advisory	OHX	Sumner, Trousdale, Wilson	42 hr
Mar 1, 2:15 AM CST	River Flood Advisory	OHX	Davidson	18 hr
Mar 1, 2:40 AM CST	River Flood Advisory	OHX	Hickman	12 hr
Mar 1, 3:44 AM CST	River Flood Advisory	OHX	Bedford	6 hr
Mar 1, 4:14 AM CST	River Flood Warning	OHX	Montgomery, Robertson	38 hr
Mar 1, 5:27 AM CST	River Flood Warning	OHX	Stewart	32 hr
Mar 1, 9:44 AM CST	River Flood Advisory	OHX	Giles	26 hr
Mar 1, 10:06 AM CST	River Flood Advisory	OHX	Lawrence	20 hr
Mar 1, 10:28 AM CST	River Flood Warning	OHX	Montgomery	32 hr
Mar 1, 3:08 PM CST	River Flood Advisory	OHX	Cheatham, Davidson, Williamson	21 hr

Nearby

Severe Thunderstorm Warnings in Tennessee, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.