Alert archive / Tennessee / Tornado Warnings in 2012

Tornado Warning 61, NWS Nashville, TN

September 17, 2012DeKalb County, Warren County, White County, Tennessee

NWS Nashville, TN issued this tornado warning at Sep 17, 2012, 4:26 PM CDT for DeKalb County, Warren County, White County, Tennessee. It was in force for 34 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: Sep 17, 2012, 4:26 PM CDT (21:26 UTC)
Expired: Sep 17, 2012, 5:00 PM CDT
In force: 34 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties DeKalb County, TN, Warren County, TN, White County, TN

The radar

The Nashville radar (KOHX), 85 km from the middle of the area, began a volume at 21:30 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
Sep 17, 4:30 PM CDT	TSTM WND DMG	5 Wnw Mcminnville, TN	SEVERAL TREES AND POWER LINES DOWN AT BETHANY ROAD AND NASHVILLE HIGHWAY WEST OF MCMINNVILLE.

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 12:00Z, 9.4 hours before the alert went out and 82 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: 491 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 510 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

147 
WFUS54 KOHX 172126
TOROHX
TNC041-177-185-172200-
/O.NEW.KOHX.TO.W.0061.120917T2126Z-120917T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
426 PM CDT MON SEP 17 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN DE KALB COUNTY IN MIDDLE TENNESSEE...
  NORTHWESTERN WARREN COUNTY IN MIDDLE TENNESSEE...
  SOUTHWESTERN WHITE COUNTY IN MIDDLE TENNESSEE...

* UNTIL 500 PM CDT

* AT 420 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 6 MILES NORTHWEST OF MCMINNVILLE...AND MOVING
  NORTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EXTREME WESTERN WHITE...NORTHERN WARREN AND
  SOUTHEASTERN DE KALB COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3595 8573 3586 8557 3566 8584 3574 8595
TIME...MOT...LOC 2125Z 224DEG 19KT 3576 8583

$$

13

1 follow-up statement

237 
WWUS54 KOHX 172153
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
453 PM CDT MON SEP 17 2012

TNC041-177-185-172203-
/O.EXP.KOHX.TO.W.0061.000000T0000Z-120917T2200Z/
WARREN TN-WHITE TN-DE KALB TN-
453 PM CDT MON SEP 17 2012

...THE TORNADO WARNING FOR SOUTHEASTERN DE KALB...SOUTHWESTERN WHITE
AND NORTHWESTERN WARREN COUNTIES WILL EXPIRE AT 500 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
 HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 3595 8573 3586 8557 3566 8584 3574 8595
TIME...MOT...LOC 2153Z 224DEG 19KT 3587 8570

$$

13

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 2:48 AM CDT	Flood Watch	OHX	Bedford, Cannon, Clay, Coffee, Cumberland, Davidson and 23 more	27 hr
Sep 17, 11:41 AM CDT	Areal Flood Advisory	OHX	Giles, Hickman, Lawrence, Lewis, Marshall, Maury and 1 more	6 hr
Sep 17, 1:46 PM CDT	Tornado Warning	OHX	Bedford	29 min
Sep 17, 2:11 PM CDT	Flash Flood Warning	OHX	Giles, Marshall	3 hr
Sep 17, 2:55 PM CDT	Areal Flood Advisory	OHX	Bedford, Rutherford, Williamson	6 hr
Sep 17, 3:55 PM CDT	Tornado Warning	OHX	Bedford	35 min
Sep 17, 3:56 PM CDT	Tornado Warning	OHX	Cannon, Coffee, Warren	34 min
Sep 17, 3:57 PM CDT	Tornado Warning	OHX	Van Buren, Warren, White	33 min
Sep 17, 4:06 PM CDT	Tornado Warning	OHX	Coffee	54 min
Sep 17, 4:28 PM CDT	Tornado Warning	OHX	Van Buren, Warren, White	32 min
Sep 17, 4:43 PM CDT	Tornado Warning	OHX	Cannon, Warren	47 min
Sep 17, 6:15 PM CDT	Areal Flood Advisory	OHX	Cannon, Coffee, DeKalb, Jackson, Overton, Putnam and 2 more	4 hr

Nearby

Tornado Warnings in Tennessee, 2012 Every tornado warning in 2012 Tornadoes in 2012

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.