Alert archive / Tennessee / Tornado Warnings in 2011

Tornado Warning 42, NWS Nashville, TN

April 11, 2011Davidson County, Williamson County, Tennessee

NWS Nashville, TN issued this tornado warning at Apr 11, 2011, 5:10 PM CDT for Davidson County, Williamson County, Tennessee. It was in force for 35 min. 2 reports 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: Apr 11, 2011, 5:10 PM CDT (22:10 UTC)
Expired: Apr 11, 2011, 5:45 PM CDT
In force: 35 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Davidson County, TN, Williamson County, TN

The radar

The Nashville radar (KOHX), 31 km from the middle of the area, began a volume at 22:13 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
Apr 11, 5:15 PM CDT	TSTM WND DMG	2 N Franklin, TN	A TREE WAS REPORTED DOWN ON HILLSBOROUGH ROAD NEAR BLACK HORSE PKWY.
Apr 11, 5:20 PM CDT	HAIL 0.88	4 S Nashville, TN	NICKEL HAIL AT THOUSAND OAKS

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, 10.2 hours before the alert went out and 19 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: 539 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 942 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 234 m²/s²
0-3 km storm-relative helicity: 233 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

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

356 
WFUS54 KOHX 112210
TOROHX
TNC037-187-112245-
/O.NEW.KOHX.TO.W.0042.110411T2210Z-110411T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
510 PM CDT MON APR 11 2011

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN DAVIDSON COUNTY IN MIDDLE TENNESSEE...
  EASTERN WILLIAMSON COUNTY IN MIDDLE TENNESSEE...

* UNTIL 545 PM CDT

* AT 505 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 6 MILES SOUTHWEST OF FOREST HILLS...OR 7 MILES
  NORTHWEST OF FRANKLIN...AND MOVING NORTHEAST AT 45 MPH.

* THIS DANGEROUS STORM WILL BE NEAR...
  FOREST HILLS...BELLE MEADE AND BRENTWOOD AROUND 515 PM CDT.
  OAK HILL AROUND 520 PM CDT.
  LP FIELD AND NASHVILLE AROUND 525 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS DANGEROUS STORM INCLUDE BERRY HILL.

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 3625 8662 3597 8661 3596 8662 3593 8661
      3591 8662 3590 8661 3585 8660 3580 8700
      3605 8705 3611 8703
TIME...MOT...LOC 2209Z 234DEG 35KT 3603 8689

$$

07

2 follow-up statements

762 
WWUS54 KOHX 112223
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
523 PM CDT MON APR 11 2011

TNC037-187-112245-
/O.CON.KOHX.TO.W.0042.000000T0000Z-110411T2245Z/
WILLIAMSON TN-DAVIDSON TN-
523 PM CDT MON APR 11 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL DAVIDSON AND
NORTHEASTERN WILLIAMSON COUNTIES UNTIL 545 PM CDT...

AT 522 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR BRENTWOOD...OR 9 MILES NORTHEAST OF
FRANKLIN...MOVING EAST AT 45 MPH.

THIS DANGEROUS STORM WILL AFFECT CENTRAL DAVIDSON AND NORTHEASTERN 
WILLIAMSON 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 3625 8662 3597 8661 3596 8662 3593 8661
      3591 8662 3590 8661 3585 8660 3586 8679
      3599 8687 3611 8686 3617 8683
TIME...MOT...LOC 2223Z 261DEG 40KT 3602 8671

$$

13

676 
WWUS54 KOHX 112238
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
538 PM CDT MON APR 11 2011

TNC037-187-112247-
/O.EXP.KOHX.TO.W.0042.000000T0000Z-110411T2245Z/
WILLIAMSON TN-DAVIDSON TN-
538 PM CDT MON APR 11 2011

...THE TORNADO WARNING FOR CENTRAL DAVIDSON AND NORTHEASTERN
WILLIAMSON COUNTIES WILL EXPIRE AT 545 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED. HOWEVER GUSTY 
WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT.

LAT...LON 3625 8662 3597 8661 3596 8662 3593 8661
      3591 8662 3590 8661 3585 8660 3586 8679
      3599 8687 3611 8686 3617 8683
TIME...MOT...LOC 2237Z 261DEG 40KT 3604 8652

$$

13

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 4:07 AM CDT	Wind Advisory	OHX	Bedford, Benton, Cannon, Cheatham, Clay, Coffee and 33 more	11 hr
Apr 11, 4:02 PM CDT	Severe Thunderstorm Warning	OHX	Benton, Hickman, Humphreys, Lewis, Perry, Wayne	43 min
Apr 11, 4:23 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Dickson, Hickman, Lawrence, Lewis, Maury and 1 more	37 min
Apr 11, 4:58 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Maury, Williamson	32 min
Apr 11, 4:59 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence, Wayne	28 min
Apr 11, 5:32 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Sumner, Trousdale, Williamson, Wilson	43 min
Apr 11, 5:51 PM CDT	Areal Flood Advisory	OHX	Cheatham, Davidson, Rutherford, Sumner, Williamson, Wilson	3 hr
Apr 11, 6:00 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Marshall	23 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.