Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 65, NWS Nashville, TN

March 15, 2012Williamson County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Mar 15, 2012, 1:49 PM CDT for Williamson County, Tennessee. It was in force for 41 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: Mar 15, 2012, 1:49 PM CDT (18:49 UTC)
Expired: Mar 15, 2012, 2:30 PM CDT
In force: 41 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

County Williamson County, TN

The radar

The Nashville radar (KOHX), 46 km from the middle of the area, began a volume at 18:50 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, 2:10 PM CDT	HAIL 1.5	11 Wsw Franklin, TN
Mar 15, 2:12 PM CDT	HAIL 1.75	7 Se Fairview, TN	REPORTED NEAR PINEWOOD ROAD AND HIGHWAY 840

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, 6.8 hours before the alert went out and 35 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.

798 
WUUS54 KOHX 151849
SVROHX
TNC187-151930-
/O.NEW.KOHX.SV.W.0065.120315T1849Z-120315T1930Z/

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

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WILLIAMSON COUNTY IN MIDDLE TENNESSEE...

* UNTIL 230 PM CDT

* AT 146 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THE
  STORM WAS NEAR FAIRVIEW...MOVING NORTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  FRANKLIN...

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 3604 8684 3604 8680 3602 8676 3592 8669
      3579 8704 3582 8712 3591 8718 3600 8704
      3599 8703 3605 8693
TIME...MOT...LOC 1849Z 241DEG 11KT 3590 8705

$$

SHAMBURGER

3 follow-up statements

387 
WWUS54 KOHX 151858
SVSOHX

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

TNC187-151930-
/O.CON.KOHX.SV.W.0065.000000T0000Z-120315T1930Z/
WILLIAMSON TN-
158 PM CDT THU MAR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WILLIAMSON
COUNTY UNTIL 230 PM CDT...

AT 155 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL.  THIS
STORM WAS LOCATED 7 MILES SOUTHEAST OF FAIRVIEW...OR 12 MILES WEST OF
FRANKLIN...MOVING NORTHEAST AT 10 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  FRANKLIN AROUND 230 PM CDT.

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 3604 8684 3604 8680 3602 8676 3592 8669
      3579 8704 3582 8712 3591 8718 3600 8704
      3599 8703 3605 8693
TIME...MOT...LOC 1858Z 243DEG 10KT 3590 8704

$$

SHAMBURGER

462 
WWUS54 KOHX 151907
SVSOHX

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

TNC187-151930-
/O.CON.KOHX.SV.W.0065.000000T0000Z-120315T1930Z/
WILLIAMSON TN-
207 PM CDT THU MAR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WILLIAMSON
COUNTY UNTIL 230 PM CDT...

AT 204 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
SEVERE THUNDERSTORM CAPABLE OF PRODUCING HEN EGG SIZE HAIL...AND 
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES 
SOUTHEAST OF FAIRVIEW...OR 11 MILES WEST OF FRANKLIN...MOVING 
NORTHEAST AT 10 MPH.

THE SEVERE THUNDERSTORM WILL AFFECT LEIPERS FORK.

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 3604 8684 3604 8680 3602 8676 3592 8669
      3579 8704 3582 8712 3591 8718 3600 8704
      3599 8703 3605 8693
TIME...MOT...LOC 1907Z 243DEG 10KT 3590 8703

$$

SHAMBURGER

394 
WWUS54 KOHX 151920
SVSOHX

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

TNC187-151930-
/O.CON.KOHX.SV.W.0065.000000T0000Z-120315T1930Z/
WILLIAMSON TN-
220 PM CDT THU MAR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WILLIAMSON
COUNTY UNTIL 230 PM CDT...

AT 218 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 8 MILES
SOUTHEAST OF FAIRVIEW...OR 10 MILES WEST OF FRANKLIN...MOVING
NORTHEAST AT 10 MPH.

IN ADDITION...AT 210 PM CST...PING PONG BALL SIZE HAIL WAS REPORTED 
NEAR LEIPERS FORK WITH THIS STORM.

THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF WILLIAMSON
COUNTY.

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 3604 8684 3604 8680 3602 8676 3592 8669
      3579 8704 3582 8712 3591 8718 3600 8704
      3599 8703 3605 8693
TIME...MOT...LOC 1920Z 247DEG 8KT 3590 8701

$$

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, 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, 2:42 PM CDT	Severe Thunderstorm Warning	OHX	Macon, Robertson, Sumner, Trousdale	63 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.