Alert archive / Tennessee / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Nashville, TN

February 28, 20114 counties in Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Feb 28, 2011, 7:00 AM 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, 2011, 7:00 AM CST (13:00 UTC)
Expired: Feb 28, 2011, 7:30 AM CST
In force: 30 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Cheatham County, TN, Dickson County, TN, Montgomery County, TN, Robertson County, TN

The radar

The Nashville radar (KOHX), 40 km from the middle of the area, began a volume at 13:02 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, 1:33 AM CST	Tornado Watch	SPC	7 hr
Feb 28, 5:59 AM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 1.0 hours before the alert went out and 45 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: 948 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 795 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 369 m²/s²
0-3 km storm-relative helicity: 404 m²/s²
Significant tornado parameter: 2.6
Supercell composite: 9.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

109 
WUUS54 KOHX 281300
SVROHX
TNC021-043-125-147-281330-
/O.NEW.KOHX.SV.W.0021.110228T1300Z-110228T1330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
700 AM CST MON FEB 28 2011

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN DICKSON COUNTY IN MIDDLE TENNESSEE...
  NORTHERN CHEATHAM COUNTY IN MIDDLE TENNESSEE...
  SOUTHEASTERN MONTGOMERY COUNTY IN MIDDLE TENNESSEE...
  SOUTHWESTERN ROBERTSON COUNTY IN MIDDLE TENNESSEE...

* UNTIL 730 AM CST

* AT 658 AM CST NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH. THE STORM WAS NEAR ASHLAND
  CITY...MOVING NORTHEAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SPRINGFIELD...
  GREENBRIER...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY INSIDE A
STRONG BUILDING...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

&&

LAT...LON 3659 8687 3639 8677 3636 8685 3639 8690
      3638 8691 3635 8690 3624 8724 3641 8732
TIME...MOT...LOC 1300Z 246DEG 51KT 3634 8722

$$

ROSE

2 follow-up statements

382 
WWUS54 KOHX 281313
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
713 AM CST MON FEB 28 2011

TNC021-043-125-147-281330-
/O.CON.KOHX.SV.W.0021.000000T0000Z-110228T1330Z/
DICKSON TN-CHEATHAM TN-MONTGOMERY TN-ROBERTSON TN-
713 AM CST MON FEB 28 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
ROBERTSON...SOUTHEASTERN MONTGOMERY...NORTHERN CHEATHAM AND
NORTHEASTERN DICKSON COUNTIES UNTIL 730 AM CST...

AT 711 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 8 MILES
NORTH OF ASHLAND CITY...MOVING NORTHEAST AT 60 MPH.

LOCATIONS IMPACTED INCLUDE...
  SPRINGFIELD AND GREENBRIER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS.

&&

LAT...LON 3659 8687 3639 8677 3636 8685 3639 8690
      3638 8691 3635 8690 3624 8724 3641 8732
TIME...MOT...LOC 1313Z 246DEG 51KT 3641 8701

$$

ROSE

866 
WWUS54 KOHX 281330
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
730 AM CST MON FEB 28 2011

TNC021-043-125-147-281341-
/O.EXP.KOHX.SV.W.0021.000000T0000Z-110228T1330Z/
DICKSON TN-CHEATHAM TN-MONTGOMERY TN-ROBERTSON TN-
730 AM CST MON FEB 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN ROBERTSON...
SOUTHEASTERN MONTGOMERY...NORTHERN CHEATHAM AND NORTHEASTERN DICKSON
COUNTIES HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.

LAT...LON 3659 8687 3639 8677 3636 8685 3639 8690
      3638 8691 3635 8690 3624 8724 3641 8732
TIME...MOT...LOC 1313Z 246DEG 51KT 3641 8701

$$

ROSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 5:16 AM CST	Wind Advisory	OHX	Bedford, Cannon, Clay, Coffee, Cumberland, Davidson and 21 more	13 hr
Feb 28, 5:55 AM CST	Flash Flood Warning	OHX	Benton, Houston, Humphreys, Montgomery, Robertson, Stewart	3 hr
Feb 28, 6:10 AM CST	Severe Thunderstorm Warning	OHX	Benton, Dickson, Houston, Humphreys	35 min
Feb 28, 6:35 AM CST	Severe Thunderstorm Warning	OHX	Cheatham, Dickson, Houston, Montgomery	25 min
Feb 28, 6:52 AM CST	Flash Flood Warning	OHX	Benton, Cheatham, Davidson, Dickson, Houston, Humphreys and 4 more	5 hr
Feb 28, 6:58 AM CST	Tornado Warning	OHX	Hickman, Lewis, Perry	32 min
Feb 28, 7:33 AM CST	Flash Flood Warning	OHX	Benton, Cheatham, Dickson, Hickman, Humphreys, Lewis and 3 more	6 hr
Feb 28, 7:57 AM CST	Flash Flood Warning	OHX	Cheatham, Davidson, Sumner, Williamson	6 hr
Feb 28, 8:12 AM CST	Flash Flood Watch	OHX	Bedford, Cannon, Clay, Coffee, Cumberland, DeKalb and 20 more	7 hr
Feb 28, 8:12 AM CST	Flash Flood Warning	OHX	Davidson, Macon, Rutherford, Smith, Sumner, Trousdale and 1 more	6 hr
Feb 28, 8:20 AM CST	Severe Thunderstorm Warning	OHX	Giles, Lawrence, Marshall, Maury	55 min
Feb 28, 8:36 AM CST	Flash Flood Warning	OHX	Clay, Fentress, Jackson, Macon, Overton, Pickett and 2 more	6 hr
Feb 28, 8:43 AM CST	Flash Flood Warning	OHX	Benton, Houston, Humphreys, Montgomery, Robertson, Stewart	3 hr
Feb 28, 9:01 AM CST	Flash Flood Warning	OHX	Giles, Hickman, Lawrence, Lewis, Marshall, Maury and 3 more	6 hr
Feb 28, 9:23 AM CST	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Rutherford, Warren	25 min
Feb 28, 9:30 AM CST	Tornado Warning	OHX	Bedford, Coffee	15 min
Feb 28, 10:19 AM CST	Severe Thunderstorm Warning	OHX	Cumberland, Van Buren, White	26 min
Feb 28, 11:12 AM CST	Areal Flood Advisory	OHX	Bedford, Cannon, Coffee, Cumberland, DeKalb, Grundy and 5 more	6 hr
Feb 28, 11:31 AM CST	Severe Thunderstorm Warning	OHX	Cannon, Rutherford, Williamson, Wilson	44 min
Feb 28, 11:47 AM CST	Tornado Warning	OHX	Cannon, DeKalb, Rutherford	28 min
Feb 28, 11:50 AM CST	Areal Flood Advisory	OHX	Benton, Cheatham, Davidson, Dickson, Houston, Humphreys and 5 more	3 hr
Feb 28, 11:56 AM CST	Severe Thunderstorm Warning	OHX	Bedford, Marshall	34 min
Feb 28, 12:18 PM CST	Tornado Warning	OHX	Coffee, Grundy, Van Buren, Warren	27 min
Feb 28, 12:49 PM CST	Severe Thunderstorm Warning	OHX	Grundy	14 min
Feb 28, 1:58 PM CST	River Flood Warning	OHX	Davidson	59 min
Feb 28, 2:08 PM CST	River Flood Advisory	OHX	Davidson	10 hr
Feb 28, 2:08 PM CST	River Flood Advisory	OHX	Davidson	10 hr
Feb 28, 2:08 PM CST	River Flood Advisory	OHX	Davidson	117 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2011 Every severe thunderstorm warning in 2011

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.