Alert archive / Tennessee / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 21, NWS Nashville, TN

February 20, 20144 counties in Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Feb 20, 2014, 10:15 PM CST for 4 counties in Tennessee. It was in force for 45 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: Feb 20, 2014, 10:15 PM CST (04:15 UTC)
Expired: Feb 20, 2014, 11:00 PM CST
In force: 45 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Cumberland County, TN, DeKalb County, TN, Putnam County, TN, White County, TN

The radar

The Nashville radar (KOHX), 128 km from the middle of the area, began a volume at 04:17 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.

What was reported inside it

Time	Report	Where	Remark
Feb 20, 10:55 PM CST	TSTM WND DMG	1 E Sparta, TN	TREE DOWN ON CROSSVILLE HIGHWAY

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
Feb 20, 6:49 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 4.3 hours before the alert went out and 128 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: 231 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 1039 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 346 m²/s²
0-3 km storm-relative helicity: 386 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

689 
WUUS54 KOHX 210415
SVROHX
TNC035-041-141-185-210500-
/O.NEW.KOHX.SV.W.0021.140221T0415Z-140221T0500Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
1015 PM CST THU FEB 20 2014

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHEASTERN PUTNAM COUNTY IN MIDDLE TENNESSEE...
  WHITE COUNTY IN MIDDLE TENNESSEE...
  CUMBERLAND COUNTY IN MIDDLE TENNESSEE...
  SOUTHEASTERN DE KALB COUNTY IN MIDDLE TENNESSEE...

* UNTIL 1100 PM CST

* AT 1012 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH. THESE SEVERE STORMS EXTENDED FROM 8 MILES NORTH
  OF SPARTA TO 11 MILES SOUTHEAST OF SMITHVILLE...AND WERE MOVING
  EAST AT 55 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SPARTA...CROSSVILLE...FAIRFIELD GLADE...DOYLE...VIRGIN FALLS STATE
  NATURAL AREA...PLEASANT HILL...INDIAN ROCK LAKE...SLATE SPRINGS...
  LAKE TANSI...CUMBERLAND MOUNTAIN STATE PARK AND CRAB ORCHARD...

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM FRIDAY MORNING FOR
CENTRAL TENNESSEE.

&&

LAT...LON 3583 8477 3575 8499 3577 8526 3581 8528
      3582 8527 3580 8536 3582 8548 3581 8550
      3582 8551 3580 8553 3580 8560 3585 8576
      3605 8552 3605 8477 3599 8470 3591 8468
TIME...MOT...LOC 0414Z 265DEG 47KT 3605 8540 3584 8565

$$

FORECASTER:07

1 follow-up statement

345 
WWUS54 KOHX 210446
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
1046 PM CST THU FEB 20 2014

TNC041-210456-
/O.CAN.KOHX.SV.W.0021.000000T0000Z-140221T0500Z/
DE KALB TN-
1046 PM CST THU FEB 20 2014

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DE KALB COUNTY IS
CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CST FRIDAY MORNING FOR
CENTRAL TENNESSEE.

LAT...LON 3583 8477 3575 8498 3577 8526 3581 8528
      3582 8527 3580 8535 3582 8545 3582 8551
      3580 8553 3581 8564 3605 8541 3605 8477
      3599 8471 3592 8468
TIME...MOT...LOC 0446Z 265DEG 47KT 3608 8488 3587 8514

$$

TNC035-141-185-210500-
/O.CON.KOHX.SV.W.0021.000000T0000Z-140221T0500Z/
PUTNAM TN-WHITE TN-CUMBERLAND TN-
1046 PM CST THU FEB 20 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CST
FOR CUMBERLAND...WHITE AND EXTREME SOUTHEASTERN PUTNAM COUNTIES...

AT 1045 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM SLATE SPRINGS TO INDIAN ROCK LAKE...OR ALONG A LINE
EXTENDING FROM 12 MILES NORTHEAST OF CROSSVILLE TO 8 MILES SOUTHWEST
OF CROSSVILLE...MOVING EAST AT 55 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LAKE
TANSI...FAIRFIELD GLADE...CUMBERLAND MOUNTAIN STATE PARK AND CRAB
ORCHARD

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 IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CST FRIDAY MORNING FOR
CENTRAL TENNESSEE.

&&

LAT...LON 3583 8477 3575 8498 3577 8526 3581 8528
      3582 8527 3580 8535 3582 8545 3582 8551
      3580 8553 3581 8564 3605 8541 3605 8477
      3599 8471 3592 8468
TIME...MOT...LOC 0446Z 265DEG 47KT 3608 8488 3587 8514

$$

07

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 20, 6:34 PM CST	Severe Thunderstorm Warning	OHX	Hickman, Humphreys, Lewis, Perry	56 min
Feb 20, 6:34 PM CST	Severe Thunderstorm Warning	OHX	Cheatham, Dickson, Montgomery, Robertson	26 min
Feb 20, 6:41 PM CST	Severe Thunderstorm Warning	OHX	Lawrence, Wayne	49 min
Feb 20, 6:58 PM CST	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Robertson	32 min
Feb 20, 7:14 PM CST	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Humphreys	16 min
Feb 20, 7:15 PM CST	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Lewis, Marshall, Maury, Williamson	45 min
Feb 20, 7:15 PM CST	Tornado Warning	OHX	Robertson, Sumner	30 min
Feb 20, 7:25 PM CST	Severe Thunderstorm Warning	OHX	Robertson, Sumner	35 min
Feb 20, 7:28 PM CST	Severe Thunderstorm Warning	OHX	Giles, Lawrence, Lewis, Maury, Wayne	47 min
Feb 20, 7:31 PM CST	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Robertson, Sumner	44 min
Feb 20, 7:56 PM CST	Tornado Warning	OHX	Davidson, Maury, Rutherford, Williamson	34 min
Feb 20, 8:07 PM CST	Severe Thunderstorm Warning	OHX	Davidson, Macon, Robertson, Rutherford, Sumner, Trousdale and 1 more	38 min
Feb 20, 8:09 PM CST	Tornado Warning	OHX	Davidson, Sumner, Wilson	36 min
Feb 20, 8:18 PM CST	Special Weather Statement	OHX	Giles, Lawrence, Marshall, Rutherford	42 min
Feb 20, 8:23 PM CST	Severe Thunderstorm Warning	OHX	Rutherford, Wilson	37 min
Feb 20, 8:35 PM CST	Severe Thunderstorm Warning	OHX	Bedford, Marshall, Maury, Rutherford, Williamson	25 min
Feb 20, 8:37 PM CST	Severe Thunderstorm Warning	OHX	Clay, DeKalb, Jackson, Macon, Smith, Sumner and 2 more	38 min
Feb 20, 8:52 PM CST	Special Weather Statement	OHX	Giles, Marshall	38 min
Feb 20, 9:07 PM CST	Severe Thunderstorm Warning	OHX	Giles, Marshall	38 min
Feb 20, 9:08 PM CST	Severe Thunderstorm Warning	OHX	Clay, DeKalb, Jackson, Overton, Pickett, Putnam and 2 more	37 min
Feb 20, 9:24 PM CST	Tornado Warning	OHX	Clay, Jackson, Overton	36 min
Feb 20, 9:40 PM CST	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Rutherford, Warren	35 min
Feb 20, 9:41 PM CST	Severe Thunderstorm Warning	OHX	DeKalb, Putnam, White	34 min
Feb 20, 9:45 PM CST	Severe Thunderstorm Warning	OHX	DeKalb, Fentress, Overton, Pickett, Putnam, White	45 min
Feb 20, 9:47 PM CST	Tornado Warning	OHX	Clay, Overton, Pickett	13 min
Feb 20, 10:03 PM CST	Tornado Warning	OHX	Bedford, Coffee	27 min
Feb 20, 10:14 PM CST	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Grundy, Van Buren, Warren	61 min
Feb 20, 10:26 PM CST	Severe Thunderstorm Warning	OHX	Cumberland, Fentress, Overton, Pickett, Putnam	34 min
Feb 20, 10:29 PM CST	Tornado Warning	OHX	Coffee, Grundy	31 min
Feb 20, 11:19 PM CST	Special Weather Statement	OHX	Cumberland	56 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2014 Every severe thunderstorm warning in 2014

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.