Alert archive / Tennessee / Tornado Warnings in 2009

Tornado Warning 2, NWS Nashville, TN

February 11, 20094 counties in Tennessee

NWS Nashville, TN issued this tornado warning at Feb 11, 2009, 12:46 PM CST for 4 counties in Tennessee. It was in force for 29 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 11, 2009, 12:46 PM CST (18:46 UTC)
Expired: Feb 11, 2009, 1:15 PM CST
In force: 29 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Cannon County, TN, Coffee County, TN, DeKalb County, TN, Warren County, TN

The radar

The Nashville radar (KOHX), 69 km from the middle of the area, began a volume at 18:46 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 11, 12:55 PM CST	TSTM WND DMG	10 S Woodbury, TN	CARPORT DESTROYED.

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 11, 10:38 AM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 6.8 hours before the alert went out and 65 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: 722 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 510 m²/s²
0-3 km storm-relative helicity: 444 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KOHX 111846
TOROHX
TNC015-031-041-177-111915-
/O.NEW.KOHX.TO.W.0002.090211T1846Z-090211T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
1246 PM CST WED FEB 11 2009

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* TORNADO WARNING FOR...
  CANNON COUNTY IN MIDDLE TENNESSEE...
  THIS INCLUDES THE CITY OF WOODBURY...
  NORTHWESTERN COFFEE COUNTY IN MIDDLE TENNESSEE...
  DEKALB COUNTY IN MIDDLE TENNESSEE...
  THIS INCLUDES THE CITY OF SMITHVILLE...
  NORTHWESTERN WARREN COUNTY IN MIDDLE TENNESSEE...

* UNTIL 115 PM CST

* AT 1242 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 14 MILES        
  SOUTHWEST OF WOODBURY...MOVING NORTHEAST AT 60 MPH.

* THE TORNADO WILL BE NEAR...
  WOODBURY BY 1255 PM CST...
  SMITHVILLE BY 110 PM CST...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

LAT...LON 3608 8570 3600 8563 3598 8565 3587 8564
      3560 8623 3569 8624 3572 8621 3575 8620
      3576 8618 3580 8618 3585 8617 3609 8573
TIME...MOT...LOC 1845Z 238DEG 53KT 3572 8621

$$

ROSE

1 follow-up statement

000 
WWUS54 KOHX 111904
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
104 PM CST WED FEB 11 2009

TNC031-111914-
/O.CAN.KOHX.TO.W.0002.000000T0000Z-090211T1915Z/
COFFEE TN-
104 PM CST WED FEB 11 2009

...THE TORNADO WARNING FOR NORTHWESTERN COFFEE COUNTY IS CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 PM CST WEDNESDAY
AFTERNOON FOR CENTRAL TENNESSEE.

LAT...LON 3608 8570 3600 8563 3597 8565 3592 8564
      3589 8565 3589 8564 3587 8564 3574 8604
      3588 8606 3609 8573
TIME...MOT...LOC 1904Z 238DEG 53KT 3586 8591

$$

TNC015-041-177-111915-
/O.CON.KOHX.TO.W.0002.000000T0000Z-090211T1915Z/
WARREN TN-CANNON TN-DEKALB TN-
104 PM CST WED FEB 11 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 115 PM CST FOR
SOUTHEASTERN DEKALB...EAST CENTRAL CANNON AND NORTHWESTERN WARREN
COUNTIES...

AT 100 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED 12 MILES SOUTHWEST OF
SMITHVILLE...OR NEAR WOODBURY...MOVING NORTHEAST AT 60 MPH.

THE TORNADO WILL BE NEAR...
  SMITHVILLE BY 110 PM CST...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS.

LAT...LON 3608 8570 3600 8563 3597 8565 3592 8564
      3589 8565 3589 8564 3587 8564 3574 8604
      3588 8606 3609 8573
TIME...MOT...LOC 1904Z 238DEG 53KT 3586 8591

$$
STEIGERWALDT

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 11, 10:46 AM CST	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Lawrence, Lewis, Montgomery	29 min
Feb 11, 11:05 AM CST	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson, Williamson	55 min
Feb 11, 11:10 AM CST	Severe Thunderstorm Warning	OHX	Giles, Marshall, Maury	50 min
Feb 11, 11:34 AM CST	Severe Thunderstorm Warning	OHX	Davidson, Robertson, Sumner, Wilson	56 min
Feb 11, 11:39 AM CST	Severe Thunderstorm Warning	OHX	Bedford, Rutherford, Williamson	66 min
Feb 11, 12:01 PM CST	Tornado Warning	OHX	Marshall	14 min
Feb 11, 12:08 PM CST	Severe Thunderstorm Warning	OHX	Macon, Smith, Trousdale, Wilson	37 min
Feb 11, 12:24 PM CST	Severe Thunderstorm Warning	OHX	Cannon, Coffee, DeKalb	36 min
Feb 11, 12:50 PM CST	Severe Thunderstorm Warning	OHX	Clay, Jackson, Macon, Overton, Putnam, Smith	40 min
Feb 11, 12:58 PM CST	Severe Thunderstorm Warning	OHX	Cannon, Coffee, DeKalb, Grundy, Warren, White	32 min
Feb 11, 1:17 PM CST	Severe Thunderstorm Warning	OHX	Grundy, Van Buren, Warren, White	43 min
Feb 11, 1:24 PM CST	Severe Thunderstorm Warning	OHX	Clay, Overton, Pickett, Putnam	36 min
Feb 11, 1:41 PM CST	Severe Thunderstorm Warning	OHX	Cumberland, Fentress, Overton, Pickett, Putnam, Van Buren and 1 more	49 min
Feb 11, 1:59 PM CST	Tornado Warning	OHX	Cumberland, Fentress	31 min

Nearby

Tornado Warnings in Tennessee, 2009 Every tornado warning in 2009 Tornadoes in 2009

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.