Alert archive / Tennessee / Special Weather Statements in 2012

Special Weather Statement, NWS Nashville, TN

December 17, 2012Giles County, Tennessee

NWS Nashville, TN issued this special weather statement at Dec 17, 2012, 4:39 PM CST for Giles County, Tennessee. It was in force for 66 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
Dec 17, 2012, 4:39 PM CST (22:39 UTC)
Expired
Dec 17, 2012, 5:45 PM CST
In force
66 min
Issued by
NWS Nashville, TN

County Giles County, TN

The radar

The Northeast Alabama radar (KHTX), 98 km from the middle of the area, began a volume at 22:40 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, 10.7 hours before the alert went out and 131 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 2012-12-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 100 joules per kilogram.LCLLFCEL10008507005003002001001 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 2012-12-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 square meters per square second.1939587897117136156175Sfc1 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
100 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
447 m above ground
0-6 km bulk shear
78 kt
0-1 km storm-relative helicity
91 m²/s²
0-3 km storm-relative helicity
185 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 Dec 17, 4:06 PM CST, 33 minutes earlier.

Area forecast discussion, Dec 17, 4:06 PM CST, 33 minutes before
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Hazardous weather outlook, Dec 17, 5:20 AM CST, 11 hours 19 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
520 AM CST MON DEC 17 2012

TNZ005>011-022>034-056>066-075-077>080-093>095-181130-
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-
520 AM CST MON DEC 17 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT...

A COLD FRONT WILL BRING SHOWERS AND THUNDERSTORMS TO MIDDLE
TENNESSEE THIS AFTERNOON. A FEW OF THE THUNDERSTORMS COULD BECOME
STRONG TO SEVERE...WITH LARGE HAIL AND STRONG GUSTY WINDS BEING
THE MAIN THREATS.

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

ANOTHER ROUND OF THUNDERSTORMS CAN BE EXPECTED WEDNESDAY NIGHT
INTO THURSDAY IN ADVANCE OF AN APPROACHING STRONG COLD FRONT. SOME
OF THESE THUNDERSTORMS COULD BECOME STRONG TO SEVERE...WITH
DAMAGING WINDS BEING THE MAIN THREAT.

.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

AL

In the hours before

Special weather statement, Dec 17, 3:12 PM CST, 1 hour 27 minutes before
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Special weather statement, Dec 17, 3:21 PM CST, 1 hour 18 minutes before
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Special weather statement, Dec 17, 3:34 PM CST, 1 hour 5 minutes before
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Special weather statement, Dec 17, 4:12 PM CST, 27 minutes before
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Special weather statement, Dec 17, 4:28 PM CST, 11 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
428 PM CST MON DEC 17 2012

TNZ011-034-172300-
FENTRESS-PICKETT-
428 PM CST MON DEC 17 2012

...SIGNIFICANT WEATHER ADVISORY FOR FENTRESS AND PICKETT COUNTIES...

AT 427 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR JAMESTOWN...MOVING EAST AT 35 MPH. THERE IS
THE POTENTIAL FOR ADDITIONAL STRONG THUNDERSTORMS TO DEVELOP AND
MOVE ACROSS FENTRESS AND PICKETT COUNTIES THROUGH 500 PM CST ALSO.

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

LAT...LON 3637 8469 3636 8473 3633 8474 3632 8479
      3629 8479 3629 8487 3624 8488 3621 8491
      3617 8490 3635 8512 3654 8498 3661 8482
      3661 8479 3658 8476 3641 8466

31
Special weather statement, Dec 17, 4:39 PM CST, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
439 PM CST MON DEC 17 2012

TNZ094-095-172345-
GILES-LAWRENCE-
439 PM CST MON DEC 17 2012

...SIGNIFICANT WEATHER ADVISORY FOR GILES AND LAWRENCE COUNTIES...

AT 438 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM JUST NORTHEAST OF LORETTO...OR JUST SOUTH OF
LAWRENCEBURG...MOVING EAST AT 35 MPH. THERE IS THE POTENTIAL FOR
ADDITIONAL STRONG THUNDERSTORMS TO DEVELOP AND MOVE ACROSS THESE
COUNTIES THROUGH 545 PM CST ALSO.

SMALL HAIL...AND WINDS AROUND 50 MPH ARE EXPECTED WITH THESE STORMS.

LAT...LON 3500 8723 3499 8746 3500 8748 3522 8746
      3520 8682 3500 8683 3499 8684 3499 8702

31

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 17, 12:08 PM CSTSpecial Weather StatementOHXRobertson67 min
Dec 17, 12:13 PM CSTSpecial Weather StatementOHXBenton, Dickson, Houston, Stewart47 min
Dec 17, 12:21 PM CSTSevere Thunderstorm WarningOHXBenton, Houston, Stewart24 min
Dec 17, 12:22 PM CSTSevere Thunderstorm WarningOHXBenton, Houston, Stewart23 min
Dec 17, 1:06 PM CSTSpecial Weather StatementOHXBenton, Humphreys24 min
Dec 17, 1:16 PM CSTSpecial Weather StatementOHXMontgomery, Robertson, Sumner59 min
Dec 17, 1:39 PM CSTSpecial Weather StatementOHXDickson, Hickman, Humphreys51 min
Dec 17, 2:26 PM CSTSpecial Weather StatementOHXCheatham, Davidson, Wilson64 min
Dec 17, 2:33 PM CSTSpecial Weather StatementOHXMacon, Trousdale27 min
Dec 17, 2:53 PM CSTSevere Thunderstorm WarningOHXClay, Macon37 min
Dec 17, 3:04 PM CSTSpecial Weather StatementOHXMacon, Trousdale56 min
Dec 17, 3:12 PM CSTSpecial Weather StatementOHXMaury, Rutherford, Williamson63 min
Dec 17, 3:21 PM CSTSpecial Weather StatementOHXGiles, Lawrence, Wayne54 min
Dec 17, 3:34 PM CSTSpecial Weather StatementOHXJackson, Smith, Wilson56 min
Dec 17, 3:41 PM CSTSevere Thunderstorm WarningOHXBedford, Marshall, Rutherford34 min
Dec 17, 4:12 PM CSTSpecial Weather StatementOHXCoffee63 min
Dec 17, 4:28 PM CSTSpecial Weather StatementOHXFentress32 min
Dec 17, 5:17 PM CSTSpecial Weather StatementOHXVan Buren28 min
Dec 17, 5:24 PM CSTSevere Thunderstorm WarningOHXGrundy, Van Buren, Warren20 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.