Alert archive / Tennessee / Special Weather Statements in 2012

Special Weather Statement, NWS Nashville, TN

March 17, 2012Williamson County, Tennessee

NWS Nashville, TN issued this special weather statement at Mar 17, 2012, 1:48 PM CDT for Williamson County, Tennessee. It was in force for 27 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: Mar 17, 2012, 1:48 PM CDT (18:48 UTC)
Expired: Mar 17, 2012, 2:15 PM CDT
In force: 27 min
Issued by: NWS Nashville, TN

County Williamson County, TN

The radar

The Nashville radar (KOHX), 54 km from the middle of the area, began a volume at 18:51 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 12:00Z, 6.8 hours before the alert went out and 46 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: 622 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 981 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 121 m²/s²
0-3 km storm-relative helicity: 129 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 Mar 17, 12:17 PM CDT, 1 hour 31 minutes earlier.

Area forecast discussion, Mar 17, 12:17 PM CDT, 1 hour 31 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Hazardous weather outlook, Mar 17, 5:28 AM CDT, 8 hours 20 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
528 AM CDT SAT MAR 17 2012

TNZ005>011-022>034-056>066-075-077>080-093>095-181030-
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-
528 AM CDT SAT MAR 17 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. SCATTERED
THUNDERSTORMS ARE EXPECTED TO DEVELOP MAINLY DURING THE AFTERNOON.
A FEW OF THESE STORMS MAY BECOME STRONG, WITH HAIL UP TO 1/2 INCH
AND WIND GUSTS OF 30 TO 40 MILES AN HOUR.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

ROSE

In the hours before

Special weather statement, Mar 17, 1:08 PM CDT, 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
108 PM CDT SAT MAR 17 2012

TNZ060-171915-
MAURY-
108 PM CDT SAT MAR 17 2012

...SIGNIFICANT WEATHER ADVISORY FOR MAURY COUNTY...

AT 107 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR MOUNT PLEASANT...OR 7 MILES SOUTHWEST OF
COLUMBIA...MOVING NORTHEAST AT 20 MPH.

THIS STORM WILL BE NEAR...
  COLUMBIA BY 125 PM CDT.
  SPRING HILL BY 155 PM CDT.

HALF INCH SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3546 8712 3543 8724 3554 8729 3555 8731
      3557 8732 3579 8703 3578 8696 3571 8678
      3568 8682 3553 8685 3552 8688 3547 8690
      3545 8696 3542 8696 3541 8701

SHAMBURGER

Special weather statement, Mar 17, 1:43 PM CDT, 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
143 PM CDT SAT MAR 17 2012

TNZ025-026-171915-
CHEATHAM-DICKSON-
143 PM CDT SAT MAR 17 2012

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

AT 141 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 12 MILES NORTHWEST OF WHITE BLUFF...OR 13 MILES
NORTH OF DICKSON...MOVING NORTHEAST AT 15 MPH.

PENNY SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3645 8713 3630 8701 3619 8739 3624 8745
      3632 8735 3632 8729 3635 8728 3641 8720
      3640 8718 3643 8718 3642 8715 3644 8715

SHAMBURGER

Special weather statement, Mar 17, 1:48 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
148 PM CDT SAT MAR 17 2012

TNZ027-057-059-171915-
DAVIDSON-HICKMAN-WILLIAMSON-
148 PM CDT SAT MAR 17 2012

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWEST DAVIDSON...EAST
HICKMAN AND WILLIAMSON COUNTIES...

AT 146 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 5 MILES SOUTHWEST OF FAIRVIEW...OR 14 MILES
SOUTHEAST OF DICKSON...MOVING EAST AT 20 MPH.

THIS STORM WILL BE NEAR...
  FAIRVIEW BY 200 PM CDT.

PENNY SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3588 8686 3588 8724 3594 8727 3597 8720
      3604 8718 3605 8713 3604 8711 3604 8704
      3607 8704 3610 8692

SHAMBURGER

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 1:08 PM CDT	Special Weather Statement	OHX	Maury	67 min
Mar 17, 1:43 PM CDT	Special Weather Statement	OHX	Cheatham	32 min
Mar 17, 1:52 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Williamson	38 min
Mar 17, 1:58 PM CDT	Special Weather Statement	OHX	Rutherford	47 min
Mar 17, 2:03 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson	27 min
Mar 17, 2:22 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Robertson, Sumner, Wilson	38 min
Mar 17, 3:04 PM CDT	Special Weather Statement	OHX	Sumner, Trousdale	41 min
Mar 17, 3:34 PM CDT	Special Weather Statement	OHX	Cheatham	56 min
Mar 17, 3:35 PM CDT	Special Weather Statement	OHX	Sumner	25 min
Mar 17, 3:38 PM CDT	Special Weather Statement	OHX	Bedford	37 min
Mar 17, 3:52 PM CDT	Areal Flood Advisory	OHX	Williamson	113 min
Mar 17, 4:11 PM CDT	Special Weather Statement	OHX	Putnam	34 min
Mar 17, 4:18 PM CDT	Special Weather Statement	OHX	Coffee	27 min
Mar 17, 6:53 PM CDT	Special Weather Statement	OHX	Wilson	22 min

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.