Alert archive / Tennessee / Special Weather Statements in 2012

Special Weather Statement, NWS Nashville, TN

September 5, 2012Lewis County, Wayne County, Tennessee

NWS Nashville, TN issued this special weather statement at Sep 5, 2012, 7:49 PM CDT for Lewis County, Wayne County, Tennessee. It was in force for 41 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: Sep 5, 2012, 7:49 PM CDT (00:49 UTC)
Expired: Sep 5, 2012, 8:30 PM CDT
In force: 41 min
Issued by: NWS Nashville, TN

Counties Lewis County, TN, Wayne County, TN

The radar

The Nashville radar (KOHX), 147 km from the middle of the area, began a volume at 00:51 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, 0.8 hours before the alert went out and 137 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: 75 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 689 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -149 m²/s²
0-3 km storm-relative helicity: -9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 Sep 5, 7:45 PM CDT, 4 minutes earlier.

Area forecast discussion, Sep 5, 7:45 PM CDT, 4 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
745 PM CDT WED SEP 5 2012

.MESOSCALE UPDATE...
CONVECTIVE LINE EXTENDS FROM HOLLADAY IN BENTON COUNTY EASTWARD
THROUGH FRANKLIN...TO MURFREESBORO...TO MONTEREY AND CONTINUES TO
SINK SOUTHWARD AS OF 0035Z. THE WESTWARD EXTENT OF THIS LINE
EXTENDS INTO WEST TENNESSEE. THE WESTERN EXTEND HAS HAD A MORE
EASTWARD COMPONENT AND HAS MERGED OVER FAR WESTERN MIDDLE
TENNESSEE DURING THE LAST HALF HOUR. THUNDERSTORM WARNINGS HAVE
BEEN CONFINED TO WESTERN MIDDLE TENNESSEE THUS FAR THIS EVENING.
THE COLD POOL ALOFT THAT HELPED TO INITIATE THE CONVECTION HAS
RELAXED. THE LATEST LMA SHOWS THE STRONGEST LIGHTNING TO BE IN THE
CELL THAT CURRENTLY IN WESTERN HICKMAN.

BOYD

&&

.PREV DISCUSSION... /ISSUED 602 PM CDT WED SEP 5 2012/

UPDATE...FOR 00Z AVIATION DISCUSSION.

AVIATION...

LINE OF STRONG STORMS WILL CONTINUE TO MOVE SOUTHEAST ACROSS
NORTHERN MIDDLE TENNESSEE THIS EVENING. LOOKS LIKE CKV IS OUT OF
THE CLEAR BUT MAY CONTINUE A VCTS THERE FOR STORMS TO THEIR
SOUTHWEST UNTIL ABOUT 01Z. WILL CONTINUE A BRIEF PERIOD OF TSRA AT
BNA THROUGH ABOUT THE SAME TIME AS THE GUST FRONT OUT AHEAD OF
CONVECTION IS REACHING THE TERMINAL NOW. GUSTS UP TO 25 KNOTS WILL
BE POSSIBLE WITH THE GUST FRONT AND WITH THE LAGGING STORMS. WILL
TIME VCTS IN AT CSV FOR AFTER 00Z.

ONCE THIS LINE MOVES THROUGH THE REGION...UPPER RIDGING LOOKS A
BIT STRONGER TOMORROW SO PERHAPS SOME ISOLATED CELLS OVER THE
PLATEAU FOR CSV WILL BE POSSIBLE THURSDAY AFTERNOON. OTHERWISE WE
WILL BE UNDER A WEAK ZONAL/NORTHWEST FLOW SO A POST-00Z FRIDAY
CONVECTIVE COMPLEX IS POSSIBLE BUT BEYOND THIS TAF PERIOD.

BETWEEN 08-14Z WE CAN EXPECT LIGHT FOG TO DEVELOP...POSSIBLY DOWN
TO IFR CONDITIONS.

PREV DISCUSSION... /ISSUED 527 PM CDT WED SEP 5 2012/

MESOSCALE UPDATE...
LINE OF CONVECTION CONTINUES TO SLIDE SOUTHEAST AND AT 2218Z
STRETCHED ACROSS FAR NORTHERN MIDDLE TENNESSEE. OVERALL THERE HAS
BEEN A GENERAL WEAKENING IN THIS ACTIVITY WITH GUSTS ALONG THE
LINE RANGING FROM 30 TO 40 MPH AS THE GUST FRONT PASSES. A FEW
GUSTS COULD BE HIGHER IN THE STRONGER STORMS DUE TO WATER LOADING.
CONVECTION HAS BEEN TIED TO A SURFACE BOUNDARY THAT EXTENDS FROM
NORTHWEST TENNESSEE NORTHEAST INTO EASTERN KENTUCKY. THERE HAS
BEEN SOME EVIDENCE OF NORTH TO SOUTH COLD POOLING ACROSS THIS
LINE. LIGHTNING STRIKES HAVE DECREASED CONSIDERABLY DURING THE
LAST HALF HOUR IN THE CONVECTION FROM FAR NORTHERN MIDDLE
TENNESSEE INTO KENTUCKY WHILE HOLDING STRONG OVER WEST TENNESSEE
AND BOOTHEEL AREA OF MISSOURI.

BOYD

&&

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

01

Hazardous weather outlook, Sep 5, 8:26 AM CDT, 11 hours 23 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NASHVILLE TN
826 AM CDT WED SEP 5 2012

TNZ005>011-022>034-056>066-075-077>080-093>095-061330-
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-
826 AM CDT WED SEP 5 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

VERY WARM AND HUMID CONDITIONS ARE EXPECTED THIS AFTERNOON. HEAT
INDICES WILL APPROACH 100 DEGREES WEST OF THE CUMBERLAND PLATEAU.
THERE IS A SLIGHT CHANCE OF SEVERE THUNDERSTORMS THIS AFTERNOON
AND EVENING...WITH DAMAGING WINDS AND HEAVY RAINFALL POSSIBLE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

A STRONG COLD FRONT WILL MOVE INTO THE REGION FRIDAY NIGHT INTO
SATURDAY. A LINE OF STORMS ARE EXPECTED TO MOVE INTO THE REGION
LATE FRIDAY NIGHT...WITH ISOLATED STRONG TO SEVERE STORMS
POSSIBLE.

.SPOTTER CALL TO ACTION STATEMENT...

EVEN THOUGH ANY SEVERE THUNDERSTORMS ARE EXPECTED TO BE BRIEF AND
ISOLATED, SPOTTERS ARE ENCOURAGED TO CLOSELY MONITOR WEATHER
CONDITIONS AND BE PREPARED TO CALL IN ANYTHING REACHING REPORTING
CRITERIA.

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

04

In the hours before

Local storm report, Sep 5, 7:00 PM CDT, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
700 PM CDT WED SEP 05 2012

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

0645 PM     TSTM WND DMG     2 SSW CAMDEN            36.04N 88.12W
09/05/2012                   BENTON             TN   911 CALL CENTER

            TREES AND POWER LINES DOWN ALONG JAMES WALKER ROAD.

&&

AL

Local storm report, Sep 5, 7:07 PM CDT, 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
707 PM CDT WED SEP 05 2012

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

0543 PM     TSTM WND DMG     LAFAYETTE               36.52N 86.03W
09/05/2012                   MACON              TN   TRAINED SPOTTER

            TREE FELL ON MOVING CAR.

&&

AL

Local storm report, Sep 5, 7:13 PM CDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
713 PM CDT WED SEP 05 2012

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

0502 PM     TSTM WND DMG     CROSS PLAINS            36.54N 86.68W
09/05/2012                   ROBERTSON          TN   TRAINED SPOTTER

            A COUPLE OF TREES DOWN.

&&

AL

Special weather statement, Sep 5, 7:17 PM CDT, 32 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
717 PM CDT WED SEP 5 2012

TNZ028-032-062>066-075-077-078-080-060100-
BEDFORD-CANNON-COFFEE-CUMBERLAND-DE KALB-PUTNAM-RUTHERFORD-VAN
BUREN-WARREN-WHITE-WILSON-
717 PM CDT WED SEP 5 2012

...SIGNIFICANT WEATHER ADVISORY FOR BEDFORD...CANNON...COFFEE...
CUMBERLAND...DE KALB...PUTNAM...RUTHERFORD...VAN BUREN...WARREN...
WHITE AND WILSON COUNTIES...

AT 714 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM MONTEREY TO
MURFREESBORO...MOVING SOUTHEAST AT 30 MPH.

THESE STORMS WILL BE NEAR...
  SPARTA BY 730 PM CDT.
  CROSSVILLE BY 745 PM CDT.
  MCMINNVILLE BY 750 PM CDT.

BRIEF BUT TORRENTIAL RAINFALL WILL OCCUR WITH THESE STORMS...AS WELL
AS WINDS UP TO AND AROUND 45 MPH. DANGEROUS CLOUD TO GROUND
LIGHTNING WILL ALSO OCCUR WITH ANY STORM.

LAT...LON 3593 8487 3551 8621 3587 8655 3620 8532
      3616 8522

AL

Local storm report, Sep 5, 7:24 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
724 PM CDT WED SEP 05 2012

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

0722 PM     HEAVY RAIN       2 NE BELLE MEADE        36.12N 86.83W
09/05/2012  M2.40 INCH       DAVIDSON           TN   TRAINED SPOTTER

            RAIN MEASURED OFF MCCRORY LANE IN BELLEVUE

&&

AL

Special weather statement, Sep 5, 7:49 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
749 PM CDT WED SEP 5 2012

TNZ056>058-093-094-060130-
HICKMAN-LAWRENCE-LEWIS-PERRY-WAYNE-
749 PM CDT WED SEP 5 2012

...SIGNIFICANT WEATHER ADVISORY FOR HICKMAN...LAWRENCE...LEWIS...
PERRY AND WAYNE COUNTIES...

AT 746 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES NORTH OF
HOHENWALD TO 10 MILES SOUTH OF LINDEN TO 6 MILES NORTHWEST OF
SAVANNAH...MOVING SOUTHEAST AT 35 MPH.

THESE STORMS WILL BE NEAR...
  HOHENWALD BY 755 PM CDT.
  WAYNESBORO BY 805 PM CDT.
  COLLINWOOD BY 820 PM CDT.

WINDS UP TO 45 MPH ARE EXPECTED WITH THESE STORMS...AS WELL AS
TORRENTIAL RAINFALL. PONDING OF WATER WILL OCCUR FROM THESE HEAVY
THUNDERSTORMS.

LAT...LON 3529 8799 3530 8802 3535 8801 3539 8803
      3541 8798 3542 8802 3546 8805 3549 8799
      3552 8798 3566 8772 3562 8735 3559 8736
      3554 8731 3522 8744 3501 8799

AL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 5, 7:12 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman	48 min
Sep 5, 7:17 PM CDT	Special Weather Statement	OHX	Cannon, Cumberland, DeKalb, Putnam, Rutherford, Warren and 1 more	43 min
Sep 5, 7:41 PM CDT	Areal Flood Advisory	OHX	Benton	80 min
Sep 5, 8:01 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Lewis, Maury	59 min
Sep 5, 8:36 PM CDT	Special Weather Statement	OHX	Giles, Lawrence	54 min
Sep 5, 8:45 PM CDT	Special Weather Statement	OHX	Marshall	45 min
Sep 5, 8:50 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence, Marshall, Maury	40 min
Sep 6, 5:12 AM CDT	Dense Fog Advisory	OHX	Benton, Cheatham, Davidson, Dickson, Hickman, Houston and 13 more	3 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.