Alert archive / Tennessee / Special Weather Statements in 2016

Special Weather Statement, NWS Nashville, TN

December 17, 2016Montgomery County, Tennessee

NWS Nashville, TN issued this special weather statement at Dec 17, 2016, 8:14 PM CST for Montgomery County, Tennessee. It was in force for 31 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, 2016, 8:14 PM CST (02:14 UTC)
Expired: Dec 17, 2016, 8:45 PM CST
In force: 31 min
Issued by: NWS Nashville, TN

County Montgomery County, TN

The radar

The Ft Campbell radar (KHPX), 34 km from the middle of the area, began a volume at 02:17 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, 2.2 hours before the alert went out and 75 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: 26 J/kg
Mixed-layer CIN: -109 J/kg
Mixed-layer LCL: 692 m above ground
0-6 km bulk shear: 81 kt
0-1 km storm-relative helicity: 511 m²/s²
0-3 km storm-relative helicity: 473 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

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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.

Hazardous weather outlook, Dec 17, 7:38 PM CST, 36 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
738 PM CST SAT DEC 17 2016

TNZ005>010-023>029-056>060-062-093-190145-
STEWART-MONTGOMERY-ROBERTSON-SUMNER-MACON-CLAY-HOUSTON-HUMPHREYS-
DICKSON-CHEATHAM-DAVIDSON-WILSON-TROUSDALE-PERRY-HICKMAN-LEWIS-
WILLIAMSON-MAURY-RUTHERFORD-WAYNE-
738 PM CST SAT DEC 17 2016

.DAY ONE...THIS AFTERNOON AND TONIGHT

TORNADO WATCH IN EFFECT UNTIL 9 PM CST FOR NORTHWEST HALF OF
MIDDLE TENNESSEE.

WINTER WEATHER ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT THROUGH 6
AM SUNDAY.

SOME STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE THIS
EVENING. MAIN CONCERNS WITH SEVERE THUNDERSTORMS THAT DO DEVELOP
WILL BE DAMAGING WINDS...ALTHOUGH ISOLATED HAIL OR A TORNADO
CANNOT TOTALLY BE RULED OUT.

LATE TONIGHT...A WINTRY MIX OF LIGHT FREEZING RAIN AND LIGHT
SLEET...EVENTUALLY TURNING OVER TO LIGHT SNOWFALL IS EXPECTED.
ALTHOUGH NO SLEET OR SNOWFALL ACCUMULATIONS ARE ANTICIPATED...ICE
ACCUMULATIONS ARE EXPECTED TO BE GENERALLY LESS THAN ONE TENTH OF
AN INCH.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

A WINTRY MIX OF LIGHT FREEZING RAIN AND LIGHT SLEET...EVENTUALLY
TURNING OVER TO LIGHT SNOWFALL IS EXPECTED ACROSS MIDDLE
TENNESSEE DURING THE MORNING HOURS ON SUNDAY. ALTHOUGH LITTLE IF
ANY ACCUMULATIONS OF SNOW AND SLEET ARE EXPECTED...TOTAL ICE
ACCUMULATIONS OF AROUND ONE TENTH OF AN INCH WILL BE POSSIBLE.
ONCE THE SLEET AND FREEZING RAIN MOVE OUT...LIGHT SNOW WILL BE
POSSIBLE. A DUSTING OF SNOW MAY OCCUR IN THE HIGHER
ELEVATIONS...ON ROOF TOPS...AND ELEVATED COLD SURFACES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TONIGHT INTO SUNDAY MORNING.

TNZ011-030>034-061-063>066-075-077>080-094-095-190145-
PICKETT-SMITH-JACKSON-PUTNAM-OVERTON-FENTRESS-MARSHALL-CANNON-
DE KALB-WHITE-CUMBERLAND-BEDFORD-COFFEE-WARREN-GRUNDY-VAN BUREN-
LAWRENCE-GILES-
738 PM CST SAT DEC 17 2016

.DAY ONE...THIS AFTERNOON AND TONIGHT

TORNADO WATCH IN EFFECT UNTIL 9 PM CST FOR THE NORTHWEST HALF OF
MIDDLE TENNESSEE.

SOME STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE THIS
EVENING. MAIN CONCERNS WITH SEVERE THUNDERSTORMS THAT DO DEVELOP
WILL BE DAMAGING WINDS...ALTHOUGH ISOLATED HAIL OR A TORNADO
CANNOT TOTALLY BE RULED OUT.

LATE TONIGHT...A WINTRY MIX OF LIGHT FREEZING RAIN AND LIGHT
SLEET...EVENTUALLY TURNING OVER TO LIGHT SNOWFALL IS EXPECTED.
ALTHOUGH NO SLEET OR SNOWFALL ACCUMULATIONS ARE ANTICIPATED...ICE
ACCUMULATIONS ARE EXPECTED TO BE GENERALLY LESS THAN ONE TENTH OF
AN INCH.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

WINTER WEATHER ADVISORY IN EFFECT FROM 6 AM THROUGH NOON SUNDAY.

A WINTRY MIX OF LIGHT FREEZING RAIN AND LIGHT SLEET...EVENTUALLY
TURNING OVER TO LIGHT SNOWFALL IS EXPECTED ACROSS MIDDLE
TENNESSEE DURING THE MORNING HOURS ON SUNDAY. ALTHOUGH LITTLE IF
ANY ACCUMULATIONS OF SNOW AND SLEET ARE EXPECTED...TOTAL ICE
ACCUMULATIONS OF AROUND ONE TENTH OF AN INCH WILL BE POSSIBLE.
ONCE THE SLEET AND FREEZING RAIN MOVE OUT...LIGHT SNOW WILL BE
POSSIBLE. A DUSTING OF SNOW MAY OCCUR IN THE HIGHER
ELEVATIONS...ON ROOF TOPS...AND ELEVATED COLD SURFACES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TONIGHT INTO SUNDAY MORNING.

SPOTTER REPORTING CRITERIA...
TORNADO
FUNNEL CLOUD
FLOODING
HAIL >= 1/2 INCH
WINDS > 50 MPH (MEASURED)
STRUCTURAL DAMAGE
TREES OR POWER LINES DOWN
ICE ACCUMULATIONS ON ROADS/SURFACES >=0.10
SNOWFALL ACCUMULATIONS >= 1/2 INCH

55

In the hours before

Special weather statement, Dec 17, 8:14 PM CST, 0 minutes before

Special Weather Statement
National Weather Service Nashville TN
814 PM CST SAT DEC 17 2016

TNZ005-006-023-180245-
Houston TN-Montgomery TN-Stewart TN-
814 PM CST SAT DEC 17 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN STEWART...
NORTHEASTERN HOUSTON AND MONTGOMERY COUNTIES UNTIL 845 PM CST...

At 814 PM CST, Doppler radar was tracking a strong thunderstorm 8
miles northeast of Erin, moving northeast at 60 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Clarksville, Cumberland City, Palmyra, Cunningham and Woodlawn.

A tornado watch remains in effect until 900 PM CST for Middle
Tennessee.

LAT...LON 3646 8713 3645 8712 3645 8715 3644 8715
      3633 8748 3634 8751 3632 8752 3628 8763
      3643 8774 3664 8734 3664 8717
TIME...MOT...LOC 0214Z 241DEG 51KT 3641 8759

10

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 17, 7:46 PM CST	Severe Thunderstorm Warning	OHX	Houston, Montgomery, Stewart	44 min
Dec 17, 8:22 PM CST	Severe Thunderstorm Warning	OHX	Montgomery, Robertson	23 min
Dec 17, 8:43 PM CST	Severe Thunderstorm Warning	OHX	Montgomery, Robertson	32 min
Dec 17, 9:57 PM CST	Special Weather Statement	OHX	Cheatham, Dickson	33 min
Dec 17, 11:19 PM CST	Severe Thunderstorm Warning	OHX	Macon, Smith, Sumner, Trousdale, Wilson	26 min
Dec 17, 11:57 PM CST	Special Weather Statement	OHX	Clay	33 min
Dec 18, 12:03 AM CST	Severe Thunderstorm Warning	OHX	Lawrence, Wayne	27 min
Dec 18, 12:16 AM CST	Severe Thunderstorm Warning	OHX	Giles, Lawrence, Marshall, Maury	29 min
Dec 18, 12:30 AM CST	Special Weather Statement	OHX	Jackson, Overton, Pickett	45 min
Dec 18, 12:35 AM CST	Severe Thunderstorm Warning	OHX	Clay, Fentress, Jackson, Overton, Pickett	25 min
Dec 18, 12:38 AM CST	Severe Thunderstorm Warning	OHX	Bedford, Giles, Marshall, Maury, Rutherford, Williamson	22 min
Dec 18, 12:44 AM CST	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Rutherford, Wilson	31 min
Dec 18, 12:49 AM CST	Severe Thunderstorm Warning	OHX	DeKalb, Putnam, White	26 min
Dec 18, 12:56 AM CST	Severe Thunderstorm Warning	OHX	Fentress, Pickett	19 min
Dec 18, 12:59 AM CST	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Marshall, Rutherford	31 min
Dec 18, 1:04 AM CST	Severe Thunderstorm Warning	OHX	Bedford, Giles, Marshall	26 min
Dec 18, 1:20 AM CST	Tornado Warning	OHX	Bedford, Cannon, Coffee, Warren	25 min
Dec 18, 1:42 AM CST	Severe Thunderstorm Warning	OHX	Coffee, Van Buren, Warren, White	33 min
Dec 18, 1:59 AM CST	Special Weather Statement	OHX	Cumberland	31 min
Dec 18, 2:11 AM CST	Special Weather Statement	OHX	Coffee	34 min
Dec 18, 2:18 AM CST	Special Weather Statement	OHX	Cumberland	27 min
Dec 18, 2:57 AM CST	Special Weather Statement	OHX	Cumberland	33 min

Nearby

Special Weather Statements in Tennessee, 2016 Every special weather statement in 2016

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.