Alert archive / Tennessee / Special Weather Statements in 2012

Special Weather Statement, NWS Nashville, TN

July 19, 20127 counties in Tennessee

NWS Nashville, TN issued this special weather statement at Jul 19, 2012, 10:59 PM CDT for 7 counties in Tennessee. It was in force for 31 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 19, 2012, 10:59 PM CDT (03:59 UTC)
Expired: Jul 19, 2012, 11:30 PM CDT
In force: 31 min
Issued by: NWS Nashville, TN

Counties Cannon County, TN, Cumberland County, TN, DeKalb County, TN, Putnam County, TN, Rutherford County, TN, White County, TN, Williamson County, TN

The radar

The Nashville radar (KOHX), 114 km from the middle of the area, began a volume at 04:02 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 nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 4.0 hours before the alert went out and 116 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.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 19, 5:21 PM CDT, 5 hours 38 minutes earlier.

Area forecast discussion, Jul 19, 5:21 PM CDT, 5 hours 38 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
521 PM CDT THU JUL 19 2012

.UPDATE...ADDED AVIATION SECTION FOR 00Z TAF'S.

&&

.AVIATION...BNA/CKV/CSV...COLD FRONT CURRENTLY STRETCHED ALONG THE
OHIO VALLEY IS EXPECTED TO GATHER STEAM AND PUSH INTO MIDDLE
TENNESSEE DURING THE EVENING AND OVERNIGHT. ATMOSPHERE ACROSS THE
MID STATE THIS AFTERNOON IS EXTREMELY MOIST AND UNSTABLE, SO AT
LEAST SCATTERED CONVECTION CAN BE EXPECTED DURING THE EVENING AND
POSSIBLY EVEN PAST MIDNIGHT. WILL HANDLE THIS WITH TEMPO GROUPS IN
THE TAF'S, WITH SIGNIFICANTLY LESS CHANCE OF PRECIPITATION IN
THE POST-FRONTAL ENVIRONMENT TOMORROW.

&&

.PREV DISCUSSION... /ISSUED 313 PM CDT THU JUL 19 2012/

DISCUSSION...

SUBSIDENCE HAS APPARENTLY WON THE BATTLE TODAY WITH SINKING AIR
ALOFT SUPPRESSING THE CUMULUS FIELD ACROSS MIDDLE TENNESSEE AND
PREVENTING ANY SHOWER AND THUNDERSTORM DEVELOPMENT. THE MOSTLY
CLEAR SKIES HAVE ALLOWED TEMPERATURES TO SOAR INTO THE MID 80S TO
MID 90S...AND WITH MOISTURE POOLING ACROSS OUR AREA SOUTH OF THE
COLD FRONT TO OUR NORTH...DEWPOINTS HAVE CLIMBED INTO THE LOW TO
UPPER 70S. UNFORTUNATELY THIS COMBINATION MEANS HEAT INDEX VALUES
HAVE CLIMBED TO NEAR OR ABOVE HEAT ADVISORY CRITERIA ACROSS THE
NORTHWEST HALF OF THE CWA AS EARLIER FEARED WITH CKV AND BNA BOTH
AT 106 ATTM. HOWEVER...SHORT TIME SPAN OF THESE HIGH HI VALUES
ALONG WITH CRITERIA NOT EXPECTED TO BE MET TOMORROW NEGATES ANY
ISSUANCE OF AN ADVISORY AT THIS TIME.

MAIN ISSUES FOR THE FORECAST REVOLVE AROUND POPS FOR TONIGHT AND
TOMORROW WITH COLD FRONT PUSHING SOUTHWARD. LATEST LOCAL WRF AND
HRRR RUNS INDICATE CURRENT PREFRONTAL ACTIVITY DEVELOPING ALONG
THE OHIO RIVER WILL ORGANIZE INTO A SEMI-LINE AND PUSH INTO THE
NORTHERN CWA THIS EVENING BEFORE WEAKENING OVERNIGHT. ADDITIONAL
ACTIVITY MAY POP UP TO THE SOUTH AND EAST OF THE LINE AS WELL.
WITH THIS THINKING AND COORDINATION WITH SURROUNDING WFOS...HAVE
ADJUSTED POPS TO LIKELY ACROSS THE NORTHERN HALF TONIGHT WITH
CHANCE POPS SOUTH. SOME OF THESE STORMS WILL LIKELY BE STRONG TO
POSSIBLE SEVERE DUE TO THE PREDICTED INSTABILITY LEVELS...WITH
DAMAGING WINDS THE MAIN THREAT. LOW TEMPERATURES WILL BE
DEPENDENT ON HOW MUCH PRECIP OCCURS AND WENT JUST UNDER LATEST
MOS GUIDANCE.

MODELS INDICATE CONVECTION WILL REJUVENATE AHEAD OF THE COLD FRONT
ACROSS THE CWA FRIDAY MORNING...WITH ACTIVITY PUSHING
SOUTHEASTWARD THROUGH THE AFTERNOON. WILL CONTINUE TREND OF LOW
POPS IN THE NORTHWEST AND LIKELY POPS IN THE SOUTHEAST. ONCE
AGAIN...SOME STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE WITH THE
MAIN THREAT BEING DAMAGING WINDS...ESPECIALLY IN OUR SOUTHEASTERN
HALF. CLOUD COVER AND PRECIP WILL ALSO KEEP HIGHS LOWER THAN
TODAY IN THE 80S TO NEAR 90. MUCH DRIER AIR IN THE MID AND UPPER
LEVELS WILL FILTER INTO THE MID STATE BEHIND THE FRONT...WITH
SLIGHTLY COOLER TEMPS AND DEWPOINTS AND DRY CONDITIONS ANTICIPATED
FOR SATURDAY INTO SUNDAY.

12Z GFS/ECMWF KEEP H5 RIDGE AXIS CENTERED FROM THE PLAINS STATES
INTO THE CENTRAL GULF COAST NEXT WEEK...WITH MIDDLE TENNESSEE IN
NORTHWEST FLOW ALOFT ON THE EAST SIDE OF THE RIDGE. WITH MOISTURE
LEVELS ALSO INCREASING BY MONDAY...LOW PRECIP CHANCES WILL RETURN
TO THE FORECAST FOR EARLY TO MID NEXT WEEK. 500MB HEIGHTS WILL BE
MUCH HIGHER THAN WE HAVE SEEN THIS PAST WEEK...SO ONLY ISOLATED TO
WIDELY SCATTERED CONVECTION IS ANTICIPATED. TEMPERATURES WILL ALSO
BE ON A WARMING TREND WITH HIGHS REACHING BACK INTO THE MID TO
UPPER 90S BY THE END OF THE FORECAST PERIOD...AND HEAT ADVISORY
CONDITIONS ARE POSSIBLE AGAIN BY THEN AS WELL.

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

ROSE

Hazardous weather outlook, Jul 19, 3:57 PM CDT, 7 hours 2 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
357 PM CDT THU JUL 19 2012

TNZ005>011-022>034-056>066-075-077>080-093>095-202100-
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-
CUMBERLAND-BEDFORD-COFFEE-WARREN-GRUNDY-VAN BUREN-WAYNE-LAWRENCE-
GILES-
357 PM CDT THU JUL 19 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TONIGHT

SCATTERED TO NUMEROUS THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG
THE OHIO RIVER AND MOVE INTO MIDDLE TENNESSEE THIS EVENING AND
TONIGHT. SOME STORMS WILL BE STRONG TO SEVERE WITH HEAVY RAIN AND
GUSTY TO DAMAGING WINDS. SOME LOCALIZED FLOODING WILL ALSO BE
POSSIBLE WITH THE HEAVIER DOWNPOURS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR ALL OF MIDDLE
TN ON FRIDAY. DAMAGING WINDS AND ISOLATED LARGE HAIL WILL BE THE
PRIMARY SEVERE WEATHER THREATS. ADDITIONALLY...LOCALIZED FLOODING
WILL BE POSSIBLE WITH THE HEAVIER DOWNPOURS.

.SPOTTER CALL TO ACTION STATEMENT...

REPORTS FROM TRAINED WEATHER SPOTTERS MAY BE NEEDED.

SPOTTER THUNDERSTORM REPORTING CRITERIA...
TORNADO
FUNNEL CLOUD
FLOODING
HAIL >= 1/2 INCH
WINDS > 50 MPH (MEASURED)
STRUCTURAL DAMAGE
TREES OR POWER LINES DOWN

55

In the hours before

Local storm report, Jul 19, 10:19 PM CDT, 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
1019 PM CDT THU JUL 19 2012

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

1015 PM     TSTM WND DMG     BELLE MEADE             36.10N 86.86W
07/19/2012                   DAVIDSON           TN   TRAINED SPOTTER

            8 INCH BRANCH BLOWN OFF TREE IN BELLE MEADE.

&&

JLM

Special weather statement, Jul 19, 10:29 PM CDT, 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
1029 PM CDT THU JUL 19 2012

TNZ026>028-030>032-059-062-064-200400-
CHEATHAM-DAVIDSON-DE
KALB-JACKSON-PUTNAM-RUTHERFORD-SMITH-WILLIAMSON-WILSON-
1029 PM CDT THU JUL 19 2012

...SIGNIFICANT WEATHER ADVISORY FOR CHEATHAM...DAVIDSON...DE KALB...
JACKSON...PUTNAM...RUTHERFORD...SMITH...WILLIAMSON AND WILSON
COUNTIES...

AT 1027 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 8 MILES SOUTHWEST OF
GAINESBORO TO 7 MILES SOUTH OF LEBANON TO PEGRAM...OR ALONG A LINE
EXTENDING FROM 8 MILES SOUTHWEST OF GAINESBORO TO 7 MILES SOUTH OF
LEBANON TO 15 MILES SOUTH OF ASHLAND CITY...MOVING SOUTHEAST AT 15
MPH.

THESE STORMS WILL BE NEAR...
  GORDONSVILLE BY 1040 PM CDT.
  WATERTOWN BY 1045 PM CDT.
  BRENTWOOD BY 1055 PM CDT.
  SMYRNA BY 1100 PM CDT.

SMALL HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THESE
STORMS...ALONG WITH FREQUENT LIGHTNING.

LAT...LON 3639 8582 3608 8549 3595 8612 3596 8615
      3595 8615 3584 8703 3611 8718 3613 8717
      3622 8642

ROSE

Local storm report, Jul 19, 10:36 PM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
1036 PM CDT THU JUL 19 2012

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

1030 PM     TSTM WND DMG     NASHVILLE               36.17N 86.78W
07/19/2012                   DAVIDSON           TN   PUBLIC

            POWER LINE DOWN...AND SPARKING...IN EAST NASHVILLE.

&&

JLM

Local storm report, Jul 19, 10:44 PM CDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
1044 PM CDT THU JUL 19 2012

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

0905 PM     TSTM WND DMG     8 SW PORTLAND           36.50N 86.62W
07/19/2012                   SUMNER             TN   TRAINED SPOTTER

            TREES DOWN ALONG HWY 25 IN COTTONTOWN

&&

11

Local storm report, Jul 19, 10:55 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
1055 PM CDT THU JUL 19 2012

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

1030 PM     TSTM WND DMG     BELLE MEADE             36.10N 86.86W
07/19/2012                   DAVIDSON           TN   LAW ENFORCEMENT

            TREES DOWN ACROSS POWERLINES IN MULTIPLE LOCATIONS ALONG
            BELLE MEADE BLVD.

&&

11

Special weather statement, Jul 19, 10:59 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
1059 PM CDT THU JUL 19 2012

TNZ027-028-030>034-059-062>066-078-080-200430-
CANNON-CUMBERLAND-DAVIDSON-DE
KALB-FENTRESS-JACKSON-OVERTON-PUTNAM-RUTHERFORD-SMITH-VAN
BUREN-WARREN-WHITE-WILLIAMSON-WILSON-
1059 PM CDT THU JUL 19 2012

...SIGNIFICANT WEATHER ADVISORY FOR CANNON...CUMBERLAND...DAVIDSON...
DE KALB...FENTRESS...JACKSON...OVERTON...PUTNAM...RUTHERFORD...
SMITH...VAN BUREN...WARREN...WHITE...WILLIAMSON AND WILSON
COUNTIES...

AT 1057 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 15 MILES NORTHWEST
OF WARTBURG TO FRANKLIN...MOVING SOUTH AT 30 MPH.

SMALL HAIL AND WINDS AROUND 50 MPH ARE EXPECTED WITH THESE STORMS.
ALSO...NEARLY CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH
THESE STORMS. PLEASE STAY INDOORS AND AWAY FROM WINDOWS WHILE THE
STORMS ARE NEARBY.

LAT...LON 3641 8466 3629 8479 3629 8487 3621 8491
      3616 8490 3599 8471 3587 8471 3577 8492
      3570 8674 3572 8683 3598 8706

TB12

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, 8:27 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Robertson, Sumner	33 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, 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

Special Weather Statements in Tennessee, 2012 Every special weather statement 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.