Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 285, NWS Nashville, TN

July 19, 2012Davidson County, Robertson County, Sumner County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Jul 19, 2012, 8:27 PM CDT for Davidson County, Robertson County, Sumner County, Tennessee. It was in force for 33 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: Jul 19, 2012, 8:27 PM CDT (01:27 UTC)
Expired: Jul 19, 2012, 9:00 PM CDT
In force: 33 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Davidson County, TN, Robertson County, TN, Sumner County, TN

The radar

The Nashville radar (KOHX), 33 km from the middle of the area, began a volume at 01:29 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 19, 8:45 PM CDT	TSTM WND GST 60	10 E Springfield, TN	RESIDENT NEAR THE INTERSECTION OF BOYLES ROAD AND PLEASANT GROVE ROAD ESTIMATED WINDS 60-70 MPH.
Jul 19, 9:05 PM CDT	TSTM WND DMG	8 Sw Portland, TN	TREES DOWN ALONG HWY 25 IN COTTONTOWN

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
Jul 19, 7:35 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 1.5 hours before the alert went out and 45 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: 2853 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1475 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 50 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.

325 
WUUS54 KOHX 200127
SVROHX
TNC037-147-165-200200-
/O.NEW.KOHX.SV.W.0285.120720T0127Z-120720T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
827 PM CDT THU JUL 19 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN ROBERTSON COUNTY IN MIDDLE TENNESSEE...
  WEST CENTRAL SUMNER COUNTY IN MIDDLE TENNESSEE...
  EXTREME NORTH CENTRAL DAVIDSON COUNTY IN MIDDLE TENNESSEE...

* UNTIL 900 PM CDT

* AT 824 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN
  EXCESS OF 70 MPH. THE STORM WAS NEAR SPRINGFIELD...MOVING SOUTHEAST
  AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CROSS PLAINS...
  GREENBRIER...
  RIDGETOP...
  WHITE HOUSE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

VERY HEAVY RAIN WILL ALSO OCCUR WITH THIS SEVERE THUNDERSTORM...WHICH
COULD FLOOD LOW LYING AREAS QUICKLY AND COVER ROADS WITH WATER. DO
NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3646 8651 3631 8671 3657 8698 3665 8686
      3666 8676
TIME...MOT...LOC 0127Z 317DEG 16KT 3656 8681

$$

FORECASTER: ROSE

1 follow-up statement

472 
WWUS54 KOHX 200146
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
846 PM CDT THU JUL 19 2012

TNC037-147-165-200200-
/O.CON.KOHX.SV.W.0285.000000T0000Z-120720T0200Z/
ROBERTSON TN-SUMNER TN-DAVIDSON TN-
846 PM CDT THU JUL 19 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EXTREME NORTH
CENTRAL DAVIDSON...WEST CENTRAL SUMNER AND EASTERN ROBERTSON COUNTIES
UNTIL 900 PM CDT...

AT 844 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN EXCESS
OF 70 MPH.  THIS STORM WAS LOCATED NEAR CROSS PLAINS...OR 7 MILES
EAST OF SPRINGFIELD...MOVING SOUTHEAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  RIDGETOP AROUND 855 PM CDT.
  WHITE HOUSE AND MILLERSVILLE AROUND 900 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO 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 3646 8651 3631 8671 3657 8698 3665 8686
      3666 8676
TIME...MOT...LOC 0146Z 317DEG 16KT 3650 8674

$$

ROSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 7:55 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Montgomery, Robertson	35 min
Jul 19, 8:51 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Jackson, Macon, Overton, Smith	54 min
Jul 19, 8:56 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson, Sumner	34 min
Jul 19, 9:00 PM CDT	Severe Thunderstorm Warning	OHX	Robertson, Sumner, Wilson	15 min
Jul 19, 9:23 PM CDT	Severe Thunderstorm Warning	OHX	Macon, Smith, Sumner, Trousdale, Wilson	37 min
Jul 19, 9:29 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Sumner, Wilson	31 min
Jul 19, 9:36 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson	24 min
Jul 19, 9:46 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Jackson, Macon, Overton, Pickett, Smith	29 min
Jul 19, 9:57 PM CDT	Severe Thunderstorm Warning	OHX	Macon, Smith, Sumner, Trousdale, Wilson	33 min
Jul 19, 10:00 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Montgomery, Stewart	45 min
Jul 19, 10:01 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Rutherford, Sumner, Williamson and 1 more	29 min
Jul 19, 10:14 PM CDT	Special Weather Statement	OHX	Fentress, Jackson, Overton, Putnam	46 min
Jul 19, 10:29 PM CDT	Special Weather Statement	OHX	Davidson, Smith, Williamson, Wilson	31 min
Jul 19, 10:41 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Williamson	19 min
Jul 19, 10:59 PM CDT	Special Weather Statement	OHX	Cannon, Cumberland, DeKalb, Putnam, Rutherford, White and 1 more	31 min
Jul 19, 11:18 PM CDT	Special Weather Statement	OHX	Stewart	27 min
Jul 19, 11:36 PM CDT	Special Weather Statement	OHX	Robertson, Sumner	24 min
Jul 20, 12:20 AM CDT	Special Weather Statement	OHX	Montgomery	40 min
Jul 20, 12:26 AM CDT	Severe Thunderstorm Warning	OHX	Davidson, Wilson	49 min
Jul 20, 12:41 AM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Dickson, Montgomery	34 min
Jul 20, 1:32 AM CDT	Areal Flood Advisory	OHX	Davidson, Rutherford, Williamson, Wilson	3 hr
Jul 20, 2:56 AM CDT	Areal Flood Advisory	OHX	Dickson, Hickman, Maury, Williamson	3 hr
Jul 20, 3:57 AM CDT	Areal Flood Advisory	OHX	Davidson, Sumner, Wilson	2 hr
Jul 20, 7:01 AM CDT	River Flood Advisory	OHX	Bedford	9 hr

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.