Alert archive / Tennessee / Special Weather Statements in 2012

Special Weather Statement, NWS Nashville, TN

March 17, 2012Cheatham County, Tennessee

NWS Nashville, TN issued this special weather statement at Mar 17, 2012, 3:34 PM CDT for Cheatham County, Tennessee. It was in force for 56 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, 3:34 PM CDT (20:34 UTC)
Expired: Mar 17, 2012, 4:30 PM CDT
In force: 56 min
Issued by: NWS Nashville, TN

County Cheatham County, TN

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 8.6 hours before the alert went out and 56 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, 3:04 PM CDT, 30 minutes earlier.

Area forecast discussion, Mar 17, 3:04 PM CDT, 30 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
304 PM CDT SAT MAR 17 2012

.DISCUSSION...ANOTHER WARM DAY ACROSS THE MID STATE WITH MANY
LOCATIONS APPROACHING 80 DEGREES. SCATTERED TSRA HAVE DEVELOPED
OVER MID TN THIS AFTERNOON WITH SOME PRODUCING HEAVY DOWNPOURS AND
NEAR SEVERE HAIL. THE SURFACE CHART SHOWED AN INSTABILITY / TROUGH
AXIS RUNNING FROM WEST KY INTO WESTERN MID TN. STORMS DEVELOPED
ALONG AND RIGHT OF THIS AXIS AS A SHORTWAVE...EVIDENT ON WATER
VAPOR...APPROACHED THE AREA. THIS ACTIVITY IS EXPECTED TO
GENERALLY SHIFT ENE LATE THIS AFTERNOON AND EVENING. CONDITIONS
ARE UNSTABLE ENOUGH FOR A CONTINUED THREAT OF LOCAL STREET
FLOODING UNDER THE HEAVY CELLS...AND SOME MARGINAL SEVERE HAIL OR
GUSTY WINDS. A SECONDARY WAVE WILL COME OVER THE AREA LATER
TONIGHT...ACTIVITY WILL BE MORE LIMITED IN STRENGTH AND COVERAGE
OVERNIGHT SO POPS WILL TAPER DOWNWARD THROUGH THE NIGHT.

BY DAYBREAK SUNDAY...ANY LINGERING TSRA WILL BE EXITING OUR
NORTHEAST COUNTIES. HEIGHTS WILL RISE SIGNIFICANTLY ON SUNDAY
SHUTTING DOWN ALL BUT ISOLATED TSRA. HIGHS WILL CLIMB INTO THE
LOWER 80S...EXCEPT UPPER 70S PLATEAU.

THE STRONG UPPER RIDGE PATTERN WILL CONTINUE MONDAY AND TUESDAY AS A
DEEP TROUGH DEVELOPS OUT WEST. THE ELEVATED HEIGHTS WILL KEEP OUR
TEMPERATURES WELL ABOVE NORMAL WITH ONLY SLIGHT RAIN CHANCES AT
BEST. GENERALLY NOT PLANNING TO INCLUDED MENTION OF TSRA FOR
MONDAY OR TUESDAY. SOME NEW RECORDS MAY BE SET...PARTICULARLY ON
TUESDAY.

SOME RECORD HIGHS...
BNA
MAR 17 82 1982
MAR 18 86 1908
MAR 19 86 1982
MAR 20 83 1948

CSV
MAR 17 76 1982
MAR 18 81 1982
MAR 19 80 1982
MAR 20 76 1994

MODELS ARE IN GENERAL AGREEMENT THAT THE CHANCE FOR TSRA WILL
INCREASE WEDNESDAY PM INTO THURSDAY AS A BAND OF DEEP MOISTURE
ARRIVES AHEAD OF A DEEP UPPER LEVEL LOW PRESSURE SYSTEM.
WIDESPREAD CLOUDS AND TSRA WILL BRING TEMPS DOWN...ALTHOUGH STILL
ABOVE NORMAL INTO THURSDAY. COOLER AIR BEHIND THE FRONT WILL DROP
TEMPS FURTHER THURSDAY PM INTO FRIDAY WITH SHOWERY WX. THE COLD
UPPER LOW WILL CREATE SOME STEEP LAPSE RATES KEEPING CONDITIONS
UNSETTLED THROUGH FRIDAY. MODELS SHOW DRY WX BY SATURDAY WITH NEAR
NORMAL TEMPS.

13

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      58  83  57  85 /  30  20  05  05
CLARKSVILLE    57  83  57  83 /  30  20  05  05
CROSSVILLE     56  77  56  79 /  50  20  05  05
COLUMBIA       57  84  57  85 /  20  10  05  05
LAWRENCEBURG   56  83  57  85 /  20  10  05  05
WAVERLY        58  83  58  84 /  30  10  05  05

&&

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

&&

Hazardous weather outlook, Mar 17, 5:28 AM CDT, 10 hours 6 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, 1:58 PM CDT, 1 hour 36 minutes before

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

TNZ062-171945-
RUTHERFORD-
158 PM CDT SAT MAR 17 2012

...SIGNIFICANT WEATHER ADVISORY FOR RUTHERFORD COUNTY...

AT 156 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 7 MILES SOUTHEAST OF NOLENSVILLE...OR 11 MILES
WEST OF MURFREESBORO...MOVING NORTHEAST AT 15 MPH.

THIS STORM WILL BE NEAR...
  SMYRNA BY 225 PM CDT.
  MURFREESBORO BY 235 PM CDT.
  WALTERHILL BY 245 PM CDT.

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

LAT...LON 3604 8641 3603 8639 3582 8625 3578 8660
      3582 8662 3583 8663 3584 8660 3590 8662
      3591 8663 3594 8662 3595 8662 3605 8642

SHAMBURGER

Local storm report, Mar 17, 2:12 PM CDT, 1 hour 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
212 PM CDT SAT MAR 17 2012

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

0211 PM     HAIL             5 E ASHLAND CITY        36.28N 86.97W
03/17/2012  E0.50 INCH       CHEATHAM           TN   TRAINED SPOTTER

            TRAINED SPOTTER REPORTED HAIL OF ONE HALF INCH 5 E OF
            ASHLAND CITY NEAR I24.

&&

TBOUCHER

Special weather statement, Mar 17, 3:04 PM CDT, 30 minutes before

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

TNZ008-009-028-029-172045-
MACON-SUMNER-TROUSDALE-WILSON-
304 PM CDT SAT MAR 17 2012

...SIGNIFICANT WEATHER ADVISORY FOR MACON...SUMNER...TROUSDALE AND
WILSON COUNTIES...

AT 300 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR HENDERSONVILLE...MOVING NORTHEAST AT 20 MPH.

THIS STORM WILL BE NEAR...
  GALLATIN BY 310 PM CDT.

HALF INCH SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3638 8603 3634 8610 3630 8612 3629 8613
      3627 8613 3620 8650 3639 8666 3665 8625

SHAMBURGER

Local storm report, Mar 17, 3:15 PM CDT, 19 minutes before

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Local storm report, Mar 17, 3:25 PM CDT, 9 minutes before

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Special weather statement, Mar 17, 3:34 PM CDT, 0 minutes before

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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, 1:48 PM CDT	Special Weather Statement	OHX	Williamson	27 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, 3:35 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.