Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 69, NWS Nashville, TN

March 15, 20124 counties in Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Mar 15, 2012, 2:42 PM CDT for 4 counties in Tennessee. It was in force for 63 min. 4 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 15, 2012, 2:42 PM CDT (19:42 UTC)
Expired: Mar 15, 2012, 3:45 PM CDT
In force: 63 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Macon County, TN, Robertson County, TN, Sumner County, TN, Trousdale County, TN

The radar

The Nashville radar (KOHX), 26 km from the middle of the area, began a volume at 19:41 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 15, 2:45 PM CDT	HAIL 1	White House, TN
Mar 15, 2:45 PM CDT	HAIL 1.75	4 Sw Westmoreland, TN	HAIL UP TO GOLF BALL SIZE COVERED THE GROUND UP TO 1 INCH DEEP IN BETHPAGE
Mar 15, 3:15 PM CDT	HAIL 0.88	Westmoreland, TN
Mar 15, 3:24 PM CDT	HAIL 0.88	Gallatin, TN	REPORTED BY GALLATIN FD AT OLD HWY 109 AT OLD DOUGLAS LANE

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
Mar 15, 2:06 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 7.7 hours before the alert went out and 38 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: 1726 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 820 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 108 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.

698 
WUUS54 KOHX 151942
SVROHX
TNC111-147-165-169-152045-
/O.NEW.KOHX.SV.W.0069.120315T1942Z-120315T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
242 PM CDT THU MAR 15 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN ROBERTSON COUNTY IN MIDDLE TENNESSEE...
  SUMNER COUNTY IN MIDDLE TENNESSEE...
  NORTHWESTERN TROUSDALE COUNTY IN MIDDLE TENNESSEE...
  WESTERN MACON COUNTY IN MIDDLE TENNESSEE...

* UNTIL 345 PM CDT

* AT 237 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE SEVERE STORMS
  EXTENDED FROM GREENBRIER TO WESTMORELAND...AND WERE MOVING EAST AT
  15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WHITE HOUSE...
  WESTMORELAND...

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM THURSDAY
EVENING FOR CENTRAL TENNESSEE.

&&

LAT...LON 3663 8597 3644 8616 3637 8628 3636 8672
      3641 8675 3636 8679 3636 8684 3638 8685
      3637 8687 3639 8690 3637 8697 3640 8702
      3665 8684 3666 8659 3664 8656 3666 8635
TIME...MOT...LOC 1943Z 254DEG 11KT 3642 8684 3650 8626

$$

SHAMBURGER

1 follow-up statement

371 
WWUS54 KOHX 152015
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
315 PM CDT THU MAR 15 2012

TNC111-147-165-169-152045-
/O.CON.KOHX.SV.W.0069.000000T0000Z-120315T2045Z/
ROBERTSON TN-SUMNER TN-TROUSDALE TN-MACON TN-
315 PM CDT THU MAR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN
MACON...NORTHWESTERN TROUSDALE...SUMNER AND EASTERN ROBERTSON
COUNTIES UNTIL 345 PM CDT...

AT 314 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM WHITE HOUSE TO 8 MILES NORTHWEST
OF WESTMORELAND...MOVING EAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  GALLATIN...WHITE HOUSE AND WESTMORELAND.

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 3663 8597 3644 8616 3637 8628 3636 8672
      3641 8675 3637 8679 3636 8679 3636 8684
      3638 8685 3637 8687 3639 8690 3665 8673
      3666 8660 3664 8656 3666 8635
TIME...MOT...LOC 2015Z 254DEG 11KT 3647 8672 3664 8636

$$

SHAMBURGER

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 14, 7:35 PM CDT	Special Weather Statement	OHX	Clay, Macon, Trousdale	55 min
Mar 15, 1:21 AM CDT	Special Weather Statement	OHX	Cumberland, White	54 min
Mar 15, 1:52 AM CDT	Severe Thunderstorm Warning	OHX	Cumberland, Fentress, Overton, Putnam	38 min
Mar 15, 12:16 PM CDT	Special Weather Statement	OHX	Williamson	59 min
Mar 15, 12:39 PM CDT	Special Weather Statement	OHX	Montgomery, Stewart	66 min
Mar 15, 12:47 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Stewart	35 min
Mar 15, 12:59 PM CDT	Severe Thunderstorm Warning	OHX	Benton, Houston, Humphreys, Stewart	61 min
Mar 15, 1:20 PM CDT	Special Weather Statement	OHX	Williamson	55 min
Mar 15, 1:31 PM CDT	Severe Thunderstorm Warning	OHX	Benton, Houston, Montgomery, Stewart	44 min
Mar 15, 1:49 PM CDT	Severe Thunderstorm Warning	OHX	Williamson	41 min
Mar 15, 2:13 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Montgomery, Stewart	47 min
Mar 15, 2:19 PM CDT	Flash Flood Warning	OHX	Williamson	3 hr
Mar 15, 2:27 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Maury, Williamson	48 min
Mar 15, 2:32 PM CDT	Severe Thunderstorm Warning	OHX	Stewart	43 min
Mar 15, 3:03 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Robertson, Rutherford, Sumner, Trousdale, Wilson	26 min
Mar 15, 3:07 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Stewart	53 min
Mar 15, 3:27 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Humphreys	33 min
Mar 15, 3:57 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Hickman, Williamson	33 min
Mar 15, 4:08 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Humphreys	37 min
Mar 15, 4:19 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Williamson	26 min
Mar 15, 4:23 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Robertson	37 min
Mar 15, 4:37 PM CDT	Severe Thunderstorm Warning	OHX	Overton, Putnam	23 min
Mar 15, 4:39 PM CDT	Severe Thunderstorm Warning	OHX	Marshall, Maury, Rutherford, Williamson	36 min
Mar 15, 5:05 PM CDT	Severe Thunderstorm Warning	OHX	Fentress, Overton, Pickett	40 min
Mar 15, 5:07 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Giles, Marshall, Maury, Rutherford, Williamson	38 min
Mar 15, 5:24 PM CDT	Flash Flood Warning	OHX	Williamson	3 hr
Mar 15, 5:31 PM CDT	Severe Thunderstorm Warning	OHX	Cannon, Davidson, Rutherford, Wilson	44 min
Mar 15, 5:45 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Giles, Marshall, Rutherford	45 min
Mar 15, 6:03 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence	35 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.