Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 85, NWS Nashville, TN

March 17, 2012Cheatham County, Davidson County, Robertson County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Mar 17, 2012, 2:03 PM CDT for Cheatham County, Davidson County, Robertson County, Tennessee. It was in force for 27 min. 5 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: Mar 17, 2012, 2:03 PM CDT (19:03 UTC)
Expired: Mar 17, 2012, 2:30 PM CDT
In force: 27 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Cheatham County, TN, Davidson County, TN, Robertson County, TN

The radar

The Nashville radar (KOHX), 23 km from the middle of the area, began a volume at 19:06 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
Mar 17, 2:11 PM CDT	HAIL 0.5	5 E Ashland City, TN	TRAINED SPOTTER REPORTED HAIL OF ONE HALF INCH 5 E OF ASHLAND CITY NEAR I24.
Mar 17, 2:15 PM CDT	TSTM WND DMG	8 Ene Ashland City, TN	LARGE TREE REPORTEDLY BLOWN DOWN BETWEEN PLESANT VIEW AND JOELTON
Mar 17, 2:15 PM CDT	HAIL 1.25	8 Ene Ashland City, TN	REPORTED BETWEEN PLEASANT VIEW AND JOELTON
Mar 17, 2:25 PM CDT	HAIL 0.88	10 Ene Ashland City, TN	REPORTED ON I-24 IN JOELTON
Mar 17, 2:30 PM CDT	HAIL 0.88	2 Nw Ashland City, TN

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, 7.1 hours before the alert went out and 28 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: 622 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 981 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 121 m²/s²
0-3 km storm-relative helicity: 129 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.

947 
WUUS54 KOHX 171903
SVROHX
TNC021-037-147-171930-
/O.NEW.KOHX.SV.W.0085.120317T1903Z-120317T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
203 PM CDT SAT MAR 17 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL ROBERTSON COUNTY IN MIDDLE TENNESSEE...
  EAST CENTRAL CHEATHAM COUNTY IN MIDDLE TENNESSEE...
  NORTHERN DAVIDSON COUNTY IN MIDDLE TENNESSEE...

* UNTIL 230 PM CDT

* AT 201 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH. THE STORM WAS NEAR ASHLAND
  CITY...MOVING NORTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RIDGETOP...
  JOELTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1 8 7 7 6 3 3 6 7 7 2. DO NOT
STAY OUTDOORS IF YOU ARE IN THE PATH OF SEVERE THUNDERSTORMS.

&&

LAT...LON 3638 8673 3634 8672 3632 8668 3621 8661
      3616 8700 3631 8711 3648 8679
TIME...MOT...LOC 1903Z 241DEG 15KT 3627 8698

$$

SHAMBURGER

1 follow-up statement

656 
WWUS54 KOHX 171916
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
216 PM CDT SAT MAR 17 2012

TNC021-037-147-171930-
/O.CON.KOHX.SV.W.0085.000000T0000Z-120317T1930Z/
ROBERTSON TN-CHEATHAM TN-DAVIDSON TN-
216 PM CDT SAT MAR 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
DAVIDSON...EAST CENTRAL CHEATHAM AND SOUTH CENTRAL ROBERTSON COUNTIES
UNTIL 230 PM CDT...

AT 211 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES
EAST OF ASHLAND CITY...MOVING NORTHEAST AT 15 MPH.

IN ADDITION...AT 211 PM CDT...HALF INCH SIZE HAIL WAS REPORTED NEAR 
ASHLAND CITY WITH THIS STORM.

THE SEVERE THUNDERSTORM WILL AFFECT RIDGETOP AND JOELTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN NASHVILLE.

&&

LAT...LON 3648 8679 3638 8673 3634 8672 3632 8668
      3621 8661 3617 8696 3634 8705
TIME...MOT...LOC 1915Z 241DEG 15KT 3629 8693

$$

SHAMBURGER

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 1:08 PM CDT	Special Weather Statement	OHX	Maury	67 min
Mar 17, 1:43 PM CDT	Special Weather Statement	OHX	Cheatham	32 min
Mar 17, 1:48 PM CDT	Special Weather Statement	OHX	Williamson	27 min
Mar 17, 1:52 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Williamson	38 min
Mar 17, 1:58 PM CDT	Special Weather Statement	OHX	Rutherford	47 min
Mar 17, 2:22 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson, Sumner, Wilson	38 min
Mar 17, 3:04 PM CDT	Special Weather Statement	OHX	Sumner, Trousdale	41 min
Mar 17, 3:34 PM CDT	Special Weather Statement	OHX	Cheatham	56 min
Mar 17, 3:35 PM CDT	Special Weather Statement	OHX	Sumner	25 min
Mar 17, 3:38 PM CDT	Special Weather Statement	OHX	Bedford	37 min
Mar 17, 3:52 PM CDT	Areal Flood Advisory	OHX	Williamson	113 min
Mar 17, 4:11 PM CDT	Special Weather Statement	OHX	Putnam	34 min
Mar 17, 4:18 PM CDT	Special Weather Statement	OHX	Coffee	27 min
Mar 17, 6:53 PM CDT	Special Weather Statement	OHX	Wilson	22 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2012 Every severe thunderstorm warning 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.