Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 306, NWS Nashville, TN

August 1, 2012Macon County, Sumner County, Trousdale County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Aug 1, 2012, 3:58 PM CDT for Macon County, Sumner County, Trousdale County, Tennessee. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 1, 2012, 3:58 PM CDT (20:58 UTC)
Expired: Aug 1, 2012, 4:27 PM CDT
In force: 29 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

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

The radar

The Nashville radar (KOHX), 41 km from the middle of the area, began a volume at 21:00 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 1, 2:40 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 9.0 hours before the alert went out and 50 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: 1698 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 1123 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

229 
WUUS54 KOHX 012058
SVROHX
TNC111-165-169-012145-
/O.NEW.KOHX.SV.W.0306.120801T2058Z-120801T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
358 PM CDT WED AUG 1 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERNSUMNER COUNTY IN MIDDLE TENNESSEE...  
  TROUSDALE COUNTY IN MIDDLE TENNESSEE...
  SOUTHWESTERN MACON COUNTY IN MIDDLE TENNESSEE...

* UNTIL 445 PM CDT

* AT 355 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH. THE STORM WAS NEAR WESTMORELAND...MOVING SOUTHEAST AT 15
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  HARTSVILLE...

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.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM WEDNESDAY
EVENING FOR CENTRAL TENNESSEE.

&&

LAT...LON 3642 8597 3641 8598 3632 8616 3632 8619
      3635 8621 3634 8623 3635 8624 3650 8636
      3657 8621
TIME...MOT...LOC 2058Z 317DEG 13KT 3649 8624

$$

AL

2 follow-up statements

626 
WWUS54 KOHX 012114
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
414 PM CDT WED AUG 1 2012

TNC111-165-169-012145-
/O.CON.KOHX.SV.W.0306.000000T0000Z-120801T2145Z/
SUMNER TN-TROUSDALE TN-MACON TN-
414 PM CDT WED AUG 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN 
MACON...TROUSDALE AND EASTERN SUMNER COUNTIES UNTIL 445 PM CDT...

AT 409 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED 6 MILES NORTHWEST OF HARTSVILLE...
MOVING SOUTHEAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  HARTSVILLE AROUND 430 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.

IN ADDITION TO DAMAGING WINDS...DANGEROUS 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 3642 8597 3641 8598 3632 8616 3632 8619
      3635 8621 3634 8623 3635 8624 3650 8636
      3657 8621
TIME...MOT...LOC 2114Z 317DEG 13KT 3645 8619

$$
AL

042 
WWUS54 KOHX 012127
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
427 PM CDT WED AUG 1 2012

TNC111-165-169-012137-
/O.CAN.KOHX.SV.W.0306.000000T0000Z-120801T2145Z/
SUMNER TN-TROUSDALE TN-MACON TN-
427 PM CDT WED AUG 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MACON...TROUSDALE
AND EASTERN SUMNER COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

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

LAT...LON 3642 8597 3641 8598 3632 8616 3632 8619
      3635 8621 3634 8623 3635 8624 3650 8636
      3657 8621
TIME...MOT...LOC 2127Z 317DEG 13KT 3642 8615

$$
AL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 1:54 AM CDT	Special Weather Statement	OHX	Davidson	36 min
Aug 1, 1:32 PM CDT	Special Weather Statement	OHX	Fentress, Overton, Pickett	58 min
Aug 1, 1:51 PM CDT	Severe Thunderstorm Warning	OHX	Fentress, Overton, Pickett	24 min
Aug 1, 2:18 PM CDT	Special Weather Statement	OHX	Fentress	27 min
Aug 1, 2:55 PM CDT	Special Weather Statement	OHX	Fentress, Overton, Pickett	50 min
Aug 1, 3:20 PM CDT	Special Weather Statement	OHX	Sumner	40 min
Aug 1, 3:28 PM CDT	Special Weather Statement	OHX	Cumberland	32 min
Aug 1, 3:35 PM CDT	Special Weather Statement	OHX	Overton	40 min
Aug 1, 3:35 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland	25 min
Aug 1, 3:42 PM CDT	Special Weather Statement	OHX	Jackson	48 min
Aug 1, 3:43 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Jackson, Overton, Putnam	32 min
Aug 1, 4:02 PM CDT	Special Weather Statement	OHX	Cumberland	28 min
Aug 1, 4:12 PM CDT	Special Weather Statement	OHX	Montgomery	48 min
Aug 1, 4:24 PM CDT	Special Weather Statement	OHX	Overton	36 min
Aug 1, 4:35 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	40 min
Aug 1, 4:36 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Montgomery, Stewart	54 min
Aug 1, 5:03 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence, Wayne	27 min
Aug 1, 5:22 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Humphreys, Montgomery, Stewart	53 min
Aug 1, 5:25 PM CDT	Special Weather Statement	OHX	Davidson	50 min
Aug 1, 5:29 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Williamson	46 min
Aug 1, 5:45 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence	30 min
Aug 1, 6:06 PM CDT	Special Weather Statement	OHX	Cheatham	39 min
Aug 1, 6:08 PM CDT	Special Weather Statement	OHX	Coffee, Grundy	52 min
Aug 1, 6:09 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Wilson	36 min
Aug 1, 6:12 PM CDT	Special Weather Statement	OHX	Maury	48 min
Aug 1, 6:15 PM CDT	Special Weather Statement	OHX	Giles	45 min
Aug 1, 6:19 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Lewis, Maury	26 min
Aug 1, 6:31 PM CDT	Severe Thunderstorm Warning	OHX	Coffee, Grundy	44 min
Aug 1, 6:34 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Williamson	41 min
Aug 1, 6:41 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman	34 min
Aug 1, 6:43 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Maury	12 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.