Alert archive / Tennessee / Special Weather Statements in 2012

Special Weather Statement, NWS Nashville, TN

August 13, 20124 counties in Tennessee

NWS Nashville, TN issued this special weather statement at Aug 13, 2012, 11:34 AM CDT for 4 counties in 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
Aug 13, 2012, 11:34 AM CDT (16:34 UTC)
Expired
Aug 13, 2012, 12:15 PM CDT
In force
41 min
Issued by
NWS Nashville, TN

Counties Cannon County, TN, Rutherford County, TN, Smith County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 43 km from the middle of the area, began a volume at 16:36 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 12:00Z, 4.6 hours before the alert went out and 36 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-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2012-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2012-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 102 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1430 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
102 m²/s²
0-3 km storm-relative helicity
107 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 Aug 13, 11:05 AM CDT, 29 minutes earlier.

Area forecast discussion, Aug 13, 11:05 AM CDT, 29 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
1105 AM CDT MON AUG 13 2012

.UPDATE...
FRONTAL BOUNDARY STILL LOCATED BACK TO THE WEST NEAR THE MS RIVER.
HOWEVER...SHORTWAVE IMPULSE AHEAD OF THE MAIN BOUNDARY IS SERVING
AS THIS MORNINGS PRIMARY CONVECTION INITIATOR. WILL GO AHEAD AND
UPDATE THE CONVECTION TO THE LIKELY CATEGORY ALONG AND JUST EAST
OF THE ONGOING CONVECTION. TO THE EAST...WILL KEEP THE
PROBABILITIES IN THE CHANCE CATEGORY. ATMOSPHERE IS CLEARLY MORE
STABLE THE FURTHER EAST YOU GO.

OTHER CHANGES TO THE GRIDS WILL INCLUDE A LOWERING OF THE HIGH
TEMPS BY A DEGREE OR TWO. ALSO...WILL ADJUST THE TIMING OF THE
MOSTLY CLOUDY SKY AS THE CLOUDS SHOULD PREVAIL FROM NOW THROUGH
THE REST OF TODAY.

UPDATE OUT SHORTLY.

&&

.PREV DISCUSSION... /ISSUED 618 AM CDT MON AUG 13 2012/

AVIATION...
COMPLICATED TAF PACKAGE THIS PERIOD AS TSRA IS ANTICIPATED MAINLY
AT KCKV AND KBNA TODAY. A COLD FRONT PASSAGE WILL BRING SCATTERED
TSRA TO BOTH THESE TERMINALS BY 18Z. A SECOND ROUND OF POSSIBLE
TSRA MAY DEVELOP AROUND 21Z. KCSV WILL BE QUIETER WITH ONLY TEMPO
GROUP FOR 21Z TSRA CHANCE AND MVFR BR CONCERNS IN EARLY MORNING.

PREV DISCUSSION... /ISSUED 338 AM CDT MON AUG 13 2012/

SHORT TERM (MON-WED)...
H5 S/W TROF WL MOVE SOUTHEAST FM THE MIDWEST TDAY. GFS/NAM/EURO/
GEM MODELS SHOW HEIGHT FALLS ASSOCIATED WITH STRONG SHORTWAVE
APPROACHING THE REGION...W/SFC LOW PRES MOVG INTO WEST MID TN THIS
AFTN. MOISTURE AND THE CHANCE OF PCPN WL INCREASE...WITH LKLY POPS
FORECASTED ACROSS A LARGE AREA OF NORTHWEST MID TN...TO INCLUDE
METRO NASHVILLE.

AS FOR THE POTENTIAL OF SEVERE WEATHER...WARM FRONT AND DEWPT
INCREASE SHOULD FACTOR INTO A STORMIER AFTERNOON THAN MORNING. 06Z
NAM12 SHOWALTER TO -5 LATE IN THE DAY. SPC CONTINUES TO ADVERTISE
A SLGT RISK OF SVRWX IN WESTERN SECTIONS FOR LARGE HAIL AND
DAMAGING WIND POTENTIAL.

MAIN AREA OF STORMS WL SHIFT INTO THE PLATEAU THIS EVENING...WITH
LKLY POPS. MAIN ENERGY ASSOC WITH SHORTWAVE WL SHIFT EAST AFT MIDNIGHT...
AND POPS WL DECREASE.

COLD FRONT WL MOVE QUICKLY ACROSS THE REGION TUE MORNING...WITH
CHANCE OF LINGERING SHOWERS PLATEAU. SFC HIGH PRES IN CONTROL
WED...WITH HIGHS IN THE MID-UPR 80S MOST LOCATIONS.

LONG TERM (THU-SUN)...
DRY CONDITIONS CONTINUE THU WITH LARGE DIURNAL SWING IN TEMPS. SFC
RIDGE SHIFTS EAST THU NGT WITH NEXT CHANCE OF STORMS WITH APPROACH
OF COLD FRONT LATE THU NGT-FRI. SYSTEM MOVES QUICKLY WITH EURO/DGEX
TIMING...GFS TOO SLOW. BOTTOM LINE...PLEASANT WEATHER CONDITIONS
NEXT WEEKEND.

&&

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

21
Hazardous weather outlook, Aug 13, 5:27 AM CDT, 6 hours 7 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
527 AM CDT MON AUG 13 2012

TNZ005-006-022>025-056>058-093-141030-
STEWART-MONTGOMERY-BENTON-HOUSTON-HUMPHREYS-DICKSON-PERRY-HICKMAN-
LEWIS-WAYNE-
527 AM CDT MON AUG 13 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR
WESTERN MIDDLE TENNESSEE. A COLD FRONT WILL PASS THROUGH MONDAY
AFTERNOON BRINGING A CHANCE FOR SEVERE THUNDERSTORMS CAPABLE OF
PRODUCING LARGE HAIL...DAMAGING WINDS...AND FREQUENT CLOUD TO
GROUND LIGHTNING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER CALL TO ACTION STATEMENT...

REPORTS FROM TRAINED WEATHER SPOTTERS MAY BE NEEDED THIS AFTERNOON
AS SEVERE WEATHER APPROACHES.

TNZ007>011-026>034-059>066-075-077>080-094-095-141030-
ROBERTSON-SUMNER-MACON-CLAY-PICKETT-CHEATHAM-DAVIDSON-WILSON-
TROUSDALE-SMITH-JACKSON-PUTNAM-OVERTON-FENTRESS-WILLIAMSON-MAURY-
MARSHALL-RUTHERFORD-CANNON-DE KALB-WHITE-CUMBERLAND-BEDFORD-
COFFEE-WARREN-GRUNDY-VAN BUREN-LAWRENCE-GILES-
527 AM CDT MON AUG 13 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

A COLD FRONT WILL PASS THROUGH THIS AFTERNOON BRINGING A LINE OF
STRONG AND POSSIBLY SEVERE THUNDERSTORMS. THE MAIN THREATS WITH
THESE STORMS WILL BE LARGE HAIL...DAMAGING WINDS...AND DANGEROUS
CLOUD TO GROUND LIGHTNING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER CALL TO ACTION STATEMENT...

REPORTS FROM TRAINED WEATHER SPOTTERS MAY BE NEEDED THIS
AFTERNOON.

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

TB12

In the hours before

Special weather statement, Aug 13, 9:08 AM CDT, 2 hours 26 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
908 AM CDT MON AUG 13 2012

TNZ005-023-131500-
HOUSTON-STEWART-
908 AM CDT MON AUG 13 2012

...SIGNIFICANT WEATHER ADVISORY FOR HOUSTON AND STEWART COUNTIES...

AT 906 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR TENNESSEE RIDGE...OR 7 MILES WEST OF ERIN...
MOVING EAST AT 30 MPH.

SMALL HAIL...AND WINDS AROUND 50 MPH ARE EXPECTED WITH THIS STORM.

LAT...LON 3639 8760 3620 8757 3622 8769 3625 8778
      3623 8782 3624 8787 3637 8788

21
Special weather statement, Aug 13, 9:28 AM CDT, 2 hours 6 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
928 AM CDT MON AUG 13 2012

TNZ006-026-131515-
CHEATHAM-MONTGOMERY-
928 AM CDT MON AUG 13 2012

...SIGNIFICANT WEATHER ADVISORY FOR CHEATHAM AND MONTGOMERY
COUNTIES...

AT 925 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 12 MILES EAST OF DOVER...MOVING EAST AT 30 MPH.

WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.

LAT...LON 3663 8713 3660 8712 3656 8714 3655 8712
      3636 8714 3635 8759 3664 8764 3664 8712

21
Local storm report, Aug 13, 9:44 AM CDT, 1 hour 50 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
944 AM CDT MON AUG 13 2012

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

0931 AM     HAIL             7 W CLARKSVILLE         36.56N 87.47W
08/13/2012  E0.75 INCH       MONTGOMERY         TN   PUBLIC

&&

SHAMBURGER
Special weather statement, Aug 13, 10:28 AM CDT, 1 hour 6 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
1028 AM CDT MON AUG 13 2012

TNZ025>027-057-059-060-131630-
CHEATHAM-DAVIDSON-DICKSON-HICKMAN-MAURY-WILLIAMSON-
1028 AM CDT MON AUG 13 2012

...SIGNIFICANT WEATHER ADVISORY FOR CHEATHAM...DAVIDSON...DICKSON...
HICKMAN...MAURY AND WILLIAMSON COUNTIES...

AT 1026 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM ASHLAND CITY TO
CENTERVILLE...MOVING EAST AT 30 MPH.

THESE STORMS WILL BE NEAR...
  ASHLAND CITY BY 1035 AM CDT.
  BELLE MEADE BY 1110 AM CDT.
  NASHVILLE BY 1115 AM CDT.
  COLUMBIA BY 1115 AM CDT.
  OAK HILL BY 1120 AM CDT.
  FRANKLIN BY 1120 AM CDT.

PENNY SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THESE
STORMS.

LAT...LON 3635 8672 3629 8664 3626 8664 3624 8659
      3617 8657 3613 8653 3602 8658 3601 8662
      3594 8662 3571 8672 3568 8682 3555 8684
      3566 8733 3565 8760 3636 8718

SHAMBURGER
Local storm report, Aug 13, 10:53 AM CDT, 41 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
1053 AM CDT MON AUG 13 2012

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

1050 AM     HAIL             NASHVILLE               36.17N 86.78W
08/13/2012  E0.88 INCH       DAVIDSON           TN   OTHER FEDERAL

            NICKEL HAIL AT I-65 AND TRINITY LANE.

&&

21
Special weather statement, Aug 13, 11:34 AM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
1134 AM CDT MON AUG 13 2012

TNZ028-030-062>064-131715-
CANNON-DE KALB-RUTHERFORD-SMITH-WILSON-
1134 AM CDT MON AUG 13 2012

...SIGNIFICANT WEATHER ADVISORY FOR CANNON...DE KALB...RUTHERFORD...
SMITH AND WILSON COUNTIES...

AT 1131 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A LINE OF STRONG THUNDERSTORM MOVING EAST AT 35 MPH.

PENNY SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THESE
STORMS.

LAT...LON 3629 8613 3631 8612 3624 8578 3565 8601
      3567 8615 3571 8622 3568 8625 3573 8668
      3580 8663 3579 8662 3581 8662 3632 8618

07

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 8:45 AM CDTSpecial Weather StatementOHXStewart45 min
Aug 13, 9:08 AM CDTSpecial Weather StatementOHXHouston52 min
Aug 13, 9:28 AM CDTSpecial Weather StatementOHXMontgomery47 min
Aug 13, 9:32 AM CDTSevere Thunderstorm WarningOHXMontgomery28 min
Aug 13, 10:00 AM CDTSevere Thunderstorm WarningOHXCheatham, Davidson, Robertson30 min
Aug 13, 10:28 AM CDTSpecial Weather StatementOHXCheatham, Davidson, Hickman, Maury, Williamson62 min
Aug 13, 10:30 AM CDTSevere Thunderstorm WarningOHXMacon, Robertson, Sumner, Trousdale45 min
Aug 13, 10:54 AM CDTSevere Thunderstorm WarningOHXDavidson, Rutherford, Sumner, Wilson51 min
Aug 13, 11:03 AM CDTSevere Thunderstorm WarningOHXWayne27 min
Aug 13, 11:43 AM CDTSpecial Weather StatementOHXGiles, Lawrence47 min
Aug 13, 11:58 AM CDTSevere Thunderstorm WarningOHXGiles, Lawrence47 min

Nearby

Special Weather Statements in Tennessee, 2012Every 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.