Alert archive / Tennessee / Special Weather Statements in 2017

Special Weather Statement, NWS Nashville, TN

June 18, 2017Davidson County, Tennessee

NWS Nashville, TN issued this special weather statement at Jun 18, 2017, 12:43 PM CDT for Davidson County, Tennessee. It was in force for 47 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: Jun 18, 2017, 12:43 PM CDT (17:43 UTC)
Expired: Jun 18, 2017, 1:30 PM CDT
In force: 47 min
Issued by: NWS Nashville, TN

County Davidson County, TN

The radar

The Nashville radar (KOHX), 19 km from the middle of the area, began a volume at 17:45 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, 5.7 hours before the alert went out and 26 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: 1482 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 753 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

NWS Nashville, TN wrote its last area forecast discussion before this special weather statement went out at Jun 18, 12:25 PM CDT, 18 minutes earlier.

Area forecast discussion, Jun 18, 12:25 PM CDT, 18 minutes before

Area Forecast Discussion
National Weather Service Nashville TN
1225 PM CDT Sun Jun 18 2017

.UPDATE...
FOR 18Z AVIATION DISCUSSION.

&&

.DISCUSSION...
Area of showers and tstms just to the northwest of our cwa at
this time. Some bowing characteristics are indicated with some
higher winds being reported just in advance of it. This activity
should begin to reach into our northwestern counties over the next
few hours. Will go ahead and bump the late morning pops to
reflect this. Elsewhere, weak vort max is located just west of the
Plateau and extends southward. Thus weak convection developing
over southern and southeastern areas. For the update, will break
out a 15z-18z wx grid and bump pops across the two previously
mentioned areas. Zone formatter may or may not pick up on this.
Will resend zones shortly. Remainder of fcst in good shape.
Convection coverage to expand in the afternoon as stronger forcing
pushes from nw-se.

&&

.AVIATION...
18Z TAF DISCUSSION.

Pre frontal forcing will continue to work southeastward across the
mid state over the next several hours. winds will gust
temporarily as the stronger storms move through bna and then csv
later. Following the initial storminess, the general theme for
much of the taf period prior to 10z or so, will be for showers to
prevail with tstms vicinity. Look for the activity to decrease
markedly from nw-se aft 12z.

&&

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

&&

DISCUSSION......Unger
AVIATION........21

Hazardous weather outlook, Jun 18, 5:07 AM CDT, 7 hours 36 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
507 AM CDT Sun Jun 18 2017

TNZ005>011-023>034-056>066-075-077>080-093>095-191030-
Stewart-Montgomery-Robertson-Sumner-Macon-Clay-Pickett-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-
507 AM CDT Sun Jun 18 2017

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...Today and Tonight

Showers and thunderstorms will increase from the northwest today,
and become numerous over all of the Mid-STate tonight. A few
storms may become severe, especially during the afternoon and
evening hours. The main concern will be damaging winds, torrential
downpours and hail.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

During severe weather, you are encouraged to pass along any
reports of wind damage and large hail to the National Weather
Service office at Old Hickory.

19

In the hours before

Special weather statement, Jun 18, 11:43 AM CDT, 1 hour before

Special Weather Statement
National Weather Service Nashville TN
1143 AM CDT SUN JUN 18 2017

TNZ007-008-026-027-181715-
Robertson TN-Davidson TN-Cheatham TN-Sumner TN-
1143 AM CDT SUN JUN 18 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL DAVIDSON...
SOUTHWESTERN SUMNER...NORTHEASTERN CHEATHAM AND ROBERTSON COUNTIES
UNTIL 1215 PM CDT...

At 1143 AM CDT, Doppler radar was tracking a strong thunderstorm near
Coopertown, or 9 miles north of Ashland City, moving east at 30 mph.

Winds in excess of 30 mph will be possible with this storm.

Locations impacted include...
Springfield, Hendersonville, Goodlettsville, White House,
Millersville, Greenbrier, Coopertown, Ridgetop, Cross Plains,
Joelton, Pleasant View, Orlinda, Adams and Cedar Hill.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3658 8665 3628 8666 3632 8720 3642 8716
      3642 8715 3643 8715 3645 8714 3646 8712
      3647 8713 3649 8713 3657 8710
TIME...MOT...LOC 1643Z 268DEG 25KT 3641 8704

MR3

Special weather statement, Jun 18, 12:10 PM CDT, 33 minutes before

Special Weather Statement
National Weather Service Nashville TN
1210 PM CDT SUN JUN 18 2017

TNZ007-008-181745-
Robertson TN-Sumner TN-
1210 PM CDT SUN JUN 18 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN SUMNER AND CENTRAL
ROBERTSON COUNTIES UNTIL 1245 PM CDT...

At 1210 PM CDT, Doppler radar was tracking a strong thunderstorm near
Cross Plains, or near Springfield, moving east at 30 mph.

Winds in excess of 30 mph will be possible with this storm.

Locations impacted include...
Gallatin, Springfield, White House, Millersville, Greenbrier,
Coopertown, Ridgetop, Cross Plains, Portland, Orlinda, Mitchellville,
Oak Grove, Cottontown and Black Jack.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3665 8634 3640 8641 3639 8674 3640 8675
      3641 8675 3639 8677 3639 8695 3665 8690
      3665 8659 3663 8656 3665 8651
TIME...MOT...LOC 1710Z 272DEG 14KT 3656 8678

MR3

Special weather statement, Jun 18, 12:43 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Nashville TN
1243 PM CDT SUN JUN 18 2017

TNZ007-008-027-028-181830-
Robertson TN-Davidson TN-Wilson TN-Sumner TN-
1243 PM CDT SUN JUN 18 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL DAVIDSON...SOUTHWESTERN
SUMNER...NORTHWESTERN WILSON AND SOUTH CENTRAL ROBERTSON COUNTIES
UNTIL 130 PM CDT...

At 1242 PM CDT, Doppler radar was tracking a strong thunderstorm over
Joelton, or 10 miles northwest of Nashville, moving east at 30 mph.

Winds in excess of 30 mph will be possible with this storm.

Locations impacted include...
Gallatin, Lebanon, Nashville, Madison, Hendersonville, Mount Juliet,
Goodlettsville, Millersville, Greenbrier, Coopertown, Lakewood,
Ridgetop, Hermitage, Belinda City, Old Hickory, Joelton, Rural Hill,
Bells Bend, Bledsoe Creek State Park and Whites Creek.

LAT...LON 3643 8634 3614 8637 3613 8698 3630 8694
      3633 8692 3636 8691 3638 8691 3639 8692
      3641 8691
TIME...MOT...LOC 1742Z 255DEG 34KT 3631 8687

21

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 11:43 AM CDT	Special Weather Statement	OHX	Robertson	32 min
Jun 18, 12:10 PM CDT	Special Weather Statement	OHX	Robertson, Sumner	35 min
Jun 18, 1:07 PM CDT	Special Weather Statement	OHX	Williamson	38 min
Jun 18, 1:41 PM CDT	Special Weather Statement	OHX	Smith, Wilson	49 min
Jun 18, 1:57 PM CDT	Severe Thunderstorm Warning	OHX	Jackson, Macon, Smith, Trousdale, Wilson	33 min
Jun 18, 2:19 PM CDT	Flash Flood Watch	OHX	Bedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 32 more	13 hr
Jun 18, 2:43 PM CDT	Areal Flood Advisory	OHX	Hickman	2 hr
Jun 18, 4:33 PM CDT	Special Weather Statement	OHX	Perry, Wayne	57 min
Jun 18, 4:39 PM CDT	Severe Thunderstorm Warning	OHX	Perry, Wayne	36 min
Jun 18, 5:09 PM CDT	Areal Flood Advisory	OHX	Perry, Wayne	3 hr
Jun 18, 5:28 PM CDT	Special Weather Statement	OHX	Lawrence, Lewis, Perry, Wayne	62 min
Jun 18, 5:46 PM CDT	Special Weather Statement	OHX	Hickman	44 min
Jun 18, 6:00 PM CDT	Areal Flood Advisory	OHX	Lawrence	2 hr
Jun 18, 6:13 PM CDT	Special Weather Statement	OHX	Giles	77 min

Nearby

Special Weather Statements in Tennessee, 2017 Every special weather statement in 2017

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.