Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 231, NWS Nashville, TN

July 6, 2012Davidson County, Wilson County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Jul 6, 2012, 2:45 PM CDT for Davidson County, Wilson County, Tennessee. It was in force for 36 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: Jul 6, 2012, 2:45 PM CDT (19:45 UTC)
Expired: Jul 6, 2012, 3:21 PM CDT
In force: 36 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Davidson County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 9 km from the middle of the area, began a volume at 19:48 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 7.8 hours before the alert went out and 21 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: 844 J/kg
Mixed-layer CIN: -200 J/kg
Mixed-layer LCL: 1469 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

244 
WUUS54 KOHX 061945
SVROHX
TNC037-189-062045-
/O.NEW.KOHX.SV.W.0231.120706T1945Z-120706T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
245 PM CDT FRI JUL 6 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN WILSON COUNTY IN MIDDLE TENNESSEE...
  EAST CENTRAL DAVIDSON COUNTY IN MIDDLE TENNESSEE...

* UNTIL 345 PM CDT

* AT 243 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 GALLATIN...MOVING SOUTHWEST AT 10
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  GREEN HILL...
  MOUNT JULIET...

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 3634 8634 3631 8636 3632 8634 3613 8638
      3621 8671 3629 8665 3626 8664 3624 8659
      3628 8656 3632 8655 3628 8652 3634 8645
      3634 8643 3631 8640 3636 8637
TIME...MOT...LOC 1945Z 023DEG 9KT 3636 8647

$$

AL

1 follow-up statement

249 
WWUS54 KOHX 062021
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
321 PM CDT FRI JUL 6 2012

TNC037-189-062031-
/O.CAN.KOHX.SV.W.0231.000000T0000Z-120706T2045Z/
WILSON TN-DAVIDSON TN-
321 PM CDT FRI JUL 6 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL DAVIDSON AND
NORTHWESTERN WILSON COUNTIES IS CANCELED...

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

LAT...LON 3634 8634 3631 8636 3632 8634 3613 8638
      3621 8671 3629 8665 3626 8664 3624 8659
      3628 8656 3632 8655 3628 8652 3634 8645
      3634 8643 3631 8640 3636 8637
TIME...MOT...LOC 2021Z 023DEG 9KT 3628 8651

$$

ROSE

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Nashville, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 6, 11:56 AM CDT, 2 hours 49 minutes earlier.

Area forecast discussion, Jul 6, 11:56 AM CDT, 2 hours 49 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
1156 AM CDT FRI JUL 6 2012

.UPDATE...ADDED AVIATION SECTION FOR 18Z TAF'S.

&&

.AVIATION...BNA/CKV/CSV...SURFACE RIDGE ALMOST ON TOP OF MIDDLE
TENNESSEE THIS AFTERNOON, WITH GENERALLY LIGHT WINDS AND ONLY
SCATTERED CLOUDS. ISOLATED POP'S ARE FORECAST THIS AFTERNOON, BUT
GIVEN THE LACK OF ANY CUMULIFORM DEVELOPMENT AS OF THIS TIME,
BELIEVE CHANCE OF THUNDERSTORMS AT ANY OF OUR TAF SITES IS
MINIMAL, SO WILL LEAVE OUT EVEN VCTS/CB REMARKS. VFR WX THEREFORE
EXPECTED THE NEXT 24 HRS.

&&

.PREV DISCUSSION... /ISSUED 556 AM CDT FRI JUL 6 2012/

UPDATE...

12Z TAF DISCUSSION.

AVIATION...

VFR. LATEST SATELLITE IMAGERY SHOWS SCATTERED CIRRUS AND
CIRROSTRATUS MOVING ACROSS THE CWA...WHILE RADAR INDCIATES ALL
PRECIP HAS EXITED THE REGION. ANTICIPATING ISOLATED TSRA TO FORM
ONCE AGAIN THIS AFTERNOON AND CONTINUE INTO THE EVENING
HOURS...AND WILL MENTION VCTS AT ALL THREE AIRPORTS FROM 19-20Z
TO 02Z WITH BEST CHANCE AT CSV. WINDS WILL BE LIGHT AND VARIABLE
THROUGH THE FORECAST PERIOD...WITH A SOUTHEAST PREDOMINATE
DIRECTION THIS MORNING BECOME NORTHEAST LATER TODAY.

PREV DISCUSSION... /ISSUED 315 AM CDT FRI JUL 6 2012/

SHORT TERM (THRU SUN)...
A COUPLE MORE DAYS OF OPPRESSIVE HEAT. HEAT ADVISORY WILL BE
EXPANDED TO INCLUDE ALL OF MID-TN THROUGH SAT EVE...EXCEPT FOR THE
HIGHER TERRAIN OF CUMBERLAND PLATEAU (CUMBERLAND/VAN BUREN/ GRUNDY
COUNTIES). MAX HEAT INDICES AROUND 105 BOTH AFTNS.

AS FOR PCPN CHANCE NEXT COUPLE OF DAYS...DO NOT SEE A TRIGGER TO
ORGANIZE LARGE AREA OF TSTMS. INSTEAD AFTN HEAT WL DRIVE ISO-SCT
TSTMS BOTH DAYS. BEST CHANCE PLATEAU. WEAK SFC TROFING SAT WL
INCREASE STORM COVERAGE TO SCT.

ANOTHER WARM DAY IS EXPECTED ON SUNDAY WITH SCATTERED SHOWERS AND
THUNDERSTORMS. MORE CLOUDS/PCPN ARE EXPECTED TO KEEP THE TEMPS
BLW HEAT ADVISORY CRITERIA (105F).

LONG TERM (MON-THU)...
THE UNUSUALLY WARM UPR RIDGE WITH RECORD-BREAKING HIGH TEMPS WL
RETROGRADE TO THE DESERT SOUTHWEST NEXT WEEK...AS A HUDSON BAY TROF
DIGS SOUTH OVR THE OHVLY REGION. PATTERN CHANGE WL BREAK THE HEAT
WAVE IN OUR REGION...WITH MORE TOLERABLE TEMPS AND ABV NORMAL PCPN
CHANCES EARLY NEXT WEEK.

THE TRANSITION IS EXPECTED TO BEGIN SUN-SUN NIGHT AS MOISTURE WILL
INCREASE AHEAD OF A COLD FRONT. THE COLD FRONT WILL BE A SLOW-
MOVER AND ENTER THE MID-STATE MON. THE SYSTEM LOOKS TO STALL WITH
THE CHANCE OF SHOWERS AND THUNDERSTORMS CONTINUING INTO MIDWEEK.

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
HEAT ADVISORY UNTIL MIDNIGHT CDT SATURDAY NIGHT FOR TNZ005>011-
022>034-056>065-075-077-078-093>095.

&&

ROSE

Hazardous weather outlook, Jul 6, 5:18 AM CDT, 9 hours 27 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
518 AM CDT FRI JUL 6 2012

TNZ005>011-022>034-056>065-075-077-078-093>095-071030-
STEWART-MONTGOMERY-ROBERTSON-SUMNER-MACON-CLAY-PICKETT-BENTON-
HOUSTON-HUMPHREYS-DICKSON-CHEATHAM-DAVIDSON-WILSON-TROUSDALE-
SMITH-JACKSON-PUTNAM-OVERTON-FENTRESS-PERRY-HICKMAN-LEWIS-
WILLIAMSON-MAURY-MARSHALL-RUTHERFORD-CANNON-DE KALB-WHITE-BEDFORD-
COFFEE-WARREN-WAYNE-LAWRENCE-GILES-
518 AM CDT FRI JUL 6 2012

...HEAT ADVISORY IN EFFECT UNTIL MIDNIGHT CDT SATURDAY NIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

HOT TEMPERATURES AND HIGH RELATIVE HUMIDITY LEVELS WILL LEAD TO
EXCESSIVE HEAT INDEX VALUES ACROSS MIDDLE TENNESSEE TODAY...WITH
HEAT INDICIES AROUND 105 EXPECTED THIS AFTERNOON.

ISOLATED STRONG THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND
EVENING. A FEW STORMS MAY CONTAIN GUSTY WINDS AND SMALL HAIL.

MORE INFORMATION IS AVAILABLE ON THE INTERNET AT WEATHER.GOV OR
BY LISTENING TO NOAA WEATHER RADIO.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SATURDAY...HOT TEMPERATURES AND HIGH RELATIVE HUMIDITY LEVELS
WILL LEAD TO EXCESSIVE HEAT INDEX VALUES ACROSS MIDDLE TENNESSEE
ONCE AGAIN...WITH HEAT INDICIES AROUND 105 EXPECTED ON SATURDAY
AFTERNOON.

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED EACH DAY FROM
SATURDAY THROUGH THURSDAY ACROSS MIDDLE TENNESSEE. A FEW STORMS
MAY BE STRONG TO LOCALLY SEVERE...WITH DAMAGING WINDS AND LARGE
HAIL POSSIBLE.

MORE INFORMATION IS AVAILABLE ON THE INTERNET AT WEATHER.GOV OR
BY LISTENING TO NOAA WEATHER RADIO.

TNZ066-079-080-071030-
CUMBERLAND-GRUNDY-VAN BUREN-
518 AM CDT FRI JUL 6 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

ISOLATED STRONG THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND
EVENING. A FEW STORMS MAY CONTAIN GUSTY WINDS AND SMALL HAIL.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED EACH DAY FROM
SATURDAY THROUGH THURSDAY ACROSS MIDDLE TENNESSEE. A FEW STORMS
MAY BE STRONG TO LOCALLY SEVERE...WITH DAMAGING WINDS AND LARGE
HAIL POSSIBLE.

SHAMBURGER

In the hours before

Local storm report, Jul 6, 2:05 PM CDT, 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
205 PM CDT FRI JUL 06 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0204 PM     TSTM WND DMG     WAVERLY                 36.09N 87.79W
07/06/2012                   HUMPHREYS          TN   PUBLIC

            CURRENTLY A POWER OUTAGE IN THE CITY OF WAVERLY REPORTED
            BY PUBLIC.

&&

LAROSA

Local storm report, Jul 6, 2:11 PM CDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE NASHVILLE TN
211 PM CDT FRI JUL 06 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0139 PM     TSTM WND DMG     WAVERLY                 36.09N 87.79W
07/06/2012                   HUMPHREYS          TN   911 CALL CENTER

            CURRENTLY A POWER OUTAGE IN THE CITY OF WAVERLY REPORTED
            BY PUBLIC. TREES AND POWERLINES DOWN IN WAVERLY VERIFIED
            BY POLICE DISPATCH.

&&
CORRECTED TIME/ADDED INFO

AL

Special weather statement, Jul 6, 2:16 PM CDT, 29 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
216 PM CDT FRI JUL 6 2012

TNZ008-062000-
SUMNER-
216 PM CDT FRI JUL 6 2012

...SIGNIFICANT WEATHER ADVISORY FOR SUMNER COUNTY...

AT 213 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 7 MILES NORTH OF GALLATIN...MOVING SOUTHWEST AT
10 MPH.

HALF INCH SIZE HAIL...AND WINDS AROUND 50 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3649 8625 3635 8635 3636 8637 3631 8640
      3634 8644 3631 8650 3628 8653 3632 8655
      3631 8657 3628 8656 3626 8657 3636 8673
      3660 8642

AL

Local storm report, Jul 6, 2:24 PM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
224 PM CDT FRI JUL 06 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0136 PM     TSTM WND GST     CLARKSVILLE             36.56N 87.35W
07/06/2012  M67 MPH          MONTGOMERY         TN   ASOS

&&

AL

Special weather statement, Jul 6, 2:27 PM CDT, 18 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
227 PM CDT FRI JUL 6 2012

TNZ022-024-056-062015-
BENTON-HUMPHREYS-PERRY-
227 PM CDT FRI JUL 6 2012

...SIGNIFICANT WEATHER ADVISORY FOR BENTON...HUMPHREYS AND PERRY
COUNTIES...

AT 223 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 15 MILES NORTH OF LINDEN...MOVING SOUTH AT 25
MPH.

THIS STORM WILL BE NEAR...
  LINDEN BY 300 PM CDT.

HALF INCH SIZE HAIL...AND WINDS AROUND 50 MPH ARE EXPECTED WITH THIS
STORM. ANOTHER STORM NEAR BIRDSONG MARINA COULD PRODUCE THE SAME
WIND GUSTS AS WELL.

LAT...LON 3598 8800 3588 8771 3586 8771 3553 8783
      3571 8805 3576 8799 3581 8798 3581 8802
      3584 8804 3585 8806 3583 8809 3584 8810

AL

Special weather statement, Jul 6, 2:30 PM CDT, 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
230 PM CDT FRI JUL 6 2012

TNZ028-062-062015-
RUTHERFORD-WILSON-
230 PM CDT FRI JUL 6 2012

...SIGNIFICANT WEATHER ADVISORY FOR RUTHERFORD AND WILSON COUNTIES...

AT 228 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR WALTERHILL...OR 12 MILES NORTH OF
MURFREESBORO...MOVING SOUTHWEST AT 5 MPH.

THIS STORM WILL BE NEAR...
  WALTERHILL BY 300 PM CDT.
  4 MILES EAST OF SMYRNA BY 315 PM CDT.

HALF INCH SIZE HAIL...AND WINDS AROUND 50 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3605 8624 3583 8642 3596 8662 3598 8661
      3600 8662 3614 8645

AL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 7:07 PM CDT	Severe Thunderstorm Warning	OHX	Rutherford, Williamson	38 min
Jul 5, 7:11 PM CDT	Special Weather Statement	OHX	Maury	34 min
Jul 5, 7:45 PM CDT	Special Weather Statement	OHX	Williamson	30 min
Jul 6, 1:35 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Humphreys	14 min
Jul 6, 2:02 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	28 min
Jul 6, 2:05 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Stewart	25 min
Jul 6, 2:11 PM CDT	Severe Thunderstorm Warning	OHX	Benton	19 min
Jul 6, 2:16 PM CDT	Special Weather Statement	OHX	Sumner	44 min
Jul 6, 2:16 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Montgomery, Stewart	29 min
Jul 6, 2:27 PM CDT	Special Weather Statement	OHX	Perry	48 min
Jul 6, 2:30 PM CDT	Special Weather Statement	OHX	Rutherford	45 min
Jul 6, 2:39 PM CDT	Severe Thunderstorm Warning	OHX	Sumner	51 min
Jul 6, 2:42 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Humphreys, Montgomery, Stewart	33 min
Jul 6, 2:49 PM CDT	Special Weather Statement	OHX	Lawrence, Wayne	56 min
Jul 6, 3:05 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	14 min
Jul 6, 3:32 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson	17 min
Jul 6, 3:49 PM CDT	Severe Thunderstorm Warning	OHX	Smith, Sumner, Trousdale, Wilson	26 min
Jul 6, 4:12 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Lewis, Perry	33 min
Jul 6, 4:37 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Williamson	38 min
Jul 6, 5:13 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Hickman, Maury, Williamson	47 min
Jul 6, 5:47 PM CDT	Severe Thunderstorm Warning	OHX	Marshall, Maury, Williamson	21 min
Jul 6, 5:53 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Rutherford	37 min
Jul 6, 5:56 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Lewis	34 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.