Alert archive / Tennessee / Tornado Warnings in 2011

Tornado Warning 104, NWS Nashville, TN

October 18, 2011Grundy County, Warren County, Tennessee

NWS Nashville, TN issued this tornado warning at Oct 18, 2011, 3:43 PM CDT for Grundy County, Warren County, Tennessee. It was in force for 32 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: Oct 18, 2011, 3:43 PM CDT (20:43 UTC)
Expired: Oct 18, 2011, 4:15 PM CDT
In force: 32 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Grundy County, TN, Warren County, TN

The radar

The Northeast Alabama radar (KHTX), 73 km from the middle of the area, began a volume at 20:46 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
Oct 18, 3:48 PM CDT	TSTM WND DMG	Viola, TN	POWER LINE BLOWN DOWN IN ROADWAY AND HAIL OF UNKNOWN SIZE REPORTED

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, 8.7 hours before the alert went out and 96 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: 142 J/kg
Mixed-layer CIN: -151 J/kg
Mixed-layer LCL: 1391 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 109 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.

700 
WFUS54 KOHX 182043
TOROHX
TNC061-177-182115-
/O.NEW.KOHX.TO.W.0104.111018T2043Z-111018T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
343 PM CDT TUE OCT 18 2011

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN GRUNDY COUNTY IN MIDDLE TENNESSEE...
  SOUTHERN WARREN COUNTY IN MIDDLE TENNESSEE...

* UNTIL 415 PM CDT

* AT 340 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 11 MILES EAST OF MANCHESTER...AND MOVING
  NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  VIOLA.

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 3546 8589 3554 8588 3554 8591 3573 8574
      3557 8558
TIME...MOT...LOC 2043Z 224DEG 27KT 3550 8587

$$
FORECASTER:
19

1 follow-up statement

301 
WWUS54 KOHX 182109
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
409 PM CDT TUE OCT 18 2011

TNC061-182117-
/O.CAN.KOHX.TO.W.0104.000000T0000Z-111018T2115Z/
GRUNDY TN-
409 PM CDT TUE OCT 18 2011

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

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

LAT...LON 3554 8591 3573 8574 3561 8563
TIME...MOT...LOC 2107Z 210DEG 22KT 3563 8575

$$

TNC177-182115-
/O.CON.KOHX.TO.W.0104.000000T0000Z-111018T2115Z/
WARREN TN-
409 PM CDT TUE OCT 18 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL WARREN COUNTY
UNTIL 415 PM CDT...

AT 406 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR MCMINNVILLE...MOVING NORTHEAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  MCMINNVILLE.

THE NATIONAL WEATHER SERVICE HAS NOT RECEIVED ANY REPORTS OF A 
TORNADO SO FAR FROM THIS STORM.

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 3554 8591 3573 8574 3561 8563
TIME...MOT...LOC 2107Z 210DEG 22KT 3563 8575

$$
STEIGERWALDT

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 18, 2:32 PM CDT	Special Weather Statement	OHX	Bedford, Cannon, Clay, Coffee, Cumberland, DeKalb and 19 more	58 min
Oct 18, 2:47 PM CDT	Severe Thunderstorm Warning	OHX	Bedford	48 min
Oct 18, 2:56 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Rutherford	64 min
Oct 18, 3:01 PM CDT	Severe Thunderstorm Warning	OHX	Macon	14 min
Oct 18, 3:04 PM CDT	Severe Thunderstorm Warning	OHX	Coffee	41 min
Oct 18, 3:21 PM CDT	Special Weather Statement	OHX	Bedford, Cannon, Clay, Coffee, Cumberland, DeKalb and 18 more	54 min
Oct 18, 3:27 PM CDT	Severe Thunderstorm Warning	OHX	Rutherford, Smith, Wilson	43 min
Oct 18, 3:33 PM CDT	Severe Thunderstorm Warning	OHX	Coffee, Warren	57 min
Oct 18, 3:40 PM CDT	Severe Thunderstorm Warning	OHX	Macon	20 min
Oct 18, 3:48 PM CDT	Severe Thunderstorm Warning	OHX	Macon, Sumner, Trousdale	27 min
Oct 18, 4:01 PM CDT	Severe Thunderstorm Warning	OHX	Macon, Smith, Trousdale, Wilson	37 min
Oct 18, 4:26 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland, Putnam, Van Buren, Warren, White	49 min
Oct 18, 4:36 PM CDT	Special Weather Statement	OHX	Giles, Marshall	24 min
Oct 18, 5:00 PM CDT	Special Weather Statement	OHX	Bedford	45 min
Oct 18, 5:34 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Rutherford	26 min
Oct 18, 6:02 PM CDT	Special Weather Statement	OHX	Cannon	28 min
Oct 18, 6:23 PM CDT	Special Weather Statement	OHX	Cannon, Coffee, DeKalb, Grundy, Van Buren, Warren and 1 more	52 min

Nearby

Tornado Warnings in Tennessee, 2011 Every tornado warning in 2011 Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.