Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 262, NWS Nashville, TN

July 8, 20124 counties in Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Jul 8, 2012, 6:43 PM CDT for 4 counties in Tennessee. It was in force for 36 min. 3 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: Jul 8, 2012, 6:43 PM CDT (23:43 UTC)
Expired: Jul 8, 2012, 7:19 PM CDT
In force: 36 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Clay County, TN, Jackson County, TN, Macon County, TN, Overton County, TN

The radar

The Nashville radar (KOHX), 97 km from the middle of the area, began a volume at 23:45 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
Jul 8, 7:00 PM CDT	TSTM WND DMG	10 W Celina, TN	TREES WERE DOWNED ON MCCORMICK RIDGE ROAD AND BAPTIST RIDGE ROAD IN THE UNION HILL COMMUNITY.
Jul 8, 7:00 PM CDT	TSTM WND DMG	5 W Celina, TN	TREES DOWNED ACROSS WESTERN PORTIONS OF THE COUNTY.
Jul 8, 7:08 PM CDT	TSTM WND DMG	Celina, TN	A FEW TREES WERE DOWNED ON ROADWAYS ACROSS THE COUNTY.

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, 11.7 hours before the alert went out and 105 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: 2027 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 985 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

177 
WUUS54 KOHX 082343
SVROHX
TNC027-087-111-133-090030-
/O.NEW.KOHX.SV.W.0262.120708T2343Z-120709T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
643 PM CDT SUN JUL 8 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN OVERTON COUNTY IN MIDDLE TENNESSEE...
  CLAY COUNTY IN MIDDLE TENNESSEE...
  NORTHERN JACKSON COUNTY IN MIDDLE TENNESSEE...
  NORTHEASTERN MACON COUNTY IN MIDDLE TENNESSEE...

* UNTIL 730 PM CDT

* AT 640 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH. THESE SEVERE STORMS EXTENDED FROM RED BOILING
  SPRINGS TO CELINA...AND WERE MOVING NORTHEAST AT 5 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CELINA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS LINE OF
SEVERE THUNDERSTORMS. MOVE INDOORS IMMEDIATELY! REMEMBER...IF YOU CAN
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

&&

LAT...LON 3640 8540 3649 8589 3663 8581 3662 8544
      3663 8529
TIME...MOT...LOC 2343Z 211DEG 6KT 3655 8578 3650 8549

$$

FORECASTER:13

2 follow-up statements

690 
WWUS54 KOHX 090001
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
701 PM CDT SUN JUL 8 2012

TNC027-087-111-133-090030-
/O.CON.KOHX.SV.W.0262.000000T0000Z-120709T0030Z/
OVERTON TN-CLAY TN-JACKSON TN-MACON TN-
701 PM CDT SUN JUL 8 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
MACON...NORTHERN JACKSON...CLAY AND NORTHWESTERN OVERTON COUNTIES
UNTIL 730 PM CDT...

AT 700 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM 6 MILES NORTHEAST OF RED BOILING SPRINGS TO CELINA...MOVING
NORTHEAST AT 5 MPH.

LOCATIONS IMPACTED INCLUDE...
  CELINA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURE'S LEADING KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 3640 8540 3649 8589 3663 8581 3662 8544
      3663 8529
TIME...MOT...LOC 0001Z 208DEG 6KT 3658 8576 3653 8547

$$

13

242 
WWUS54 KOHX 090019 RRA
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
719 PM CDT SUN JUL 8 2012

TNC027-087-111-133-090029-
/O.CAN.KOHX.SV.W.0262.000000T0000Z-120709T0030Z/
OVERTON TN-CLAY TN-JACKSON TN-MACON TN-
719 PM CDT SUN JUL 8 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MACON...NORTHERN
JACKSON...CLAY AND NORTHWESTERN OVERTON COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED AND MOVED
OUT OF THE WARNED AREA.  HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH
THESE THUNDERSTORMS.

LAT...LON 3640 8540 3649 8589 3663 8581 3662 8544
      3663 8529
TIME...MOT...LOC 0019Z 208DEG 6KT 3661 8574 3656 8545

$$

13

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 11:21 PM CDT	Special Weather Statement	OHX	Cheatham	24 min
Jul 7, 11:27 PM CDT	Special Weather Statement	OHX	Davidson	63 min
Jul 7, 11:44 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Dickson, Montgomery	46 min
Jul 7, 11:53 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson	20 min
Jul 8, 12:19 AM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Montgomery, Stewart	41 min
Jul 8, 12:32 AM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Humphreys	28 min
Jul 8, 12:51 AM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Humphreys, Stewart	54 min
Jul 8, 1:27 AM CDT	Flash Flood Warning	OHX	Dickson, Humphreys	116 min
Jul 8, 1:42 AM CDT	Severe Thunderstorm Warning	OHX	Benton, Humphreys	63 min
Jul 8, 1:47 AM CDT	Special Weather Statement	OHX	Houston	58 min
Jul 8, 2:35 AM CDT	Special Weather Statement	OHX	Stewart	25 min
Jul 8, 3:09 AM CDT	Special Weather Statement	OHX	Stewart	66 min
Jul 8, 2:13 PM CDT	Severe Thunderstorm Warning	OHX	Benton, Humphreys	32 min
Jul 8, 3:17 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Humphreys	28 min
Jul 8, 3:45 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Humphreys	30 min
Jul 8, 4:00 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Maury, Williamson	30 min
Jul 8, 4:14 PM CDT	Special Weather Statement	OHX	Davidson	31 min
Jul 8, 4:17 PM CDT	Special Weather Statement	OHX	Davidson	28 min
Jul 8, 4:31 PM CDT	Special Weather Statement	OHX	Williamson	29 min
Jul 8, 4:49 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Williamson	41 min
Jul 8, 4:52 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Williamson	38 min
Jul 8, 5:10 PM CDT	Severe Thunderstorm Warning	OHX	Smith, Trousdale, Wilson	35 min
Jul 8, 5:15 PM CDT	Severe Thunderstorm Warning	OHX	Wilson	45 min
Jul 8, 5:26 PM CDT	Severe Thunderstorm Warning	OHX	Marshall, Maury, Rutherford, Williamson	23 min
Jul 8, 5:43 PM CDT	Severe Thunderstorm Warning	OHX	Cannon, Coffee, Rutherford, Wilson	62 min
Jul 8, 5:44 PM CDT	Severe Thunderstorm Warning	OHX	Smith, Trousdale, Wilson	46 min
Jul 8, 6:02 PM CDT	Severe Thunderstorm Warning	OHX	Smith, Wilson	32 min
Jul 8, 6:15 PM CDT	Areal Flood Advisory	OHX	Rutherford, Smith, Wilson	66 min
Jul 8, 6:25 PM CDT	Severe Thunderstorm Warning	OHX	Macon, Sumner, Trousdale	35 min
Jul 8, 6:52 PM CDT	Severe Thunderstorm Warning	OHX	Macon, Sumner, Trousdale	27 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.