Alert archive / Tennessee / Special Weather Statements in 2018

Special Weather Statement, NWS Nashville, TN

July 6, 2018Davidson County, Williamson County, Tennessee

NWS Nashville, TN issued this special weather statement at Jul 6, 2018, 11:13 AM CDT for Davidson County, Williamson 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: Jul 6, 2018, 11:13 AM CDT (16:13 UTC)
Expired: Jul 6, 2018, 12:00 PM CDT
In force: 47 min
Issued by: NWS Nashville, TN

Counties Davidson County, TN, Williamson County, TN

The radar

The Nashville radar (KOHX), 22 km from the middle of the area, began a volume at 16:14 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

Little Rock, AR (KBYH), launched 12:00Z, 4.2 hours before the alert went out and 325 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: 571 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 1308 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 60 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 Jul 6, 10:04 AM CDT, 1 hour 9 minutes earlier.

Area forecast discussion, Jul 6, 10:04 AM CDT, 1 hour 9 minutes before

Area Forecast Discussion
National Weather Service Nashville TN
1004 AM CDT Fri Jul 6 2018

.UPDATE...
FOR MORNING DISCUSSION.

&&

.DISCUSSION...

Showers and thunderstorms have enveloped areas of Middle TN
northwest of metro Nashville at update time. These storms are
drifting southeastward and are moving into areas where instability
is climbing due to diurnal heating where dew points are in the low
70s. While no shear is expected this afternoon, that doesn't mean
a few of these storms won't offer some gusty winds, heavy
downpours and lots of lightning. Look for additional development
south of I-40 this afternoon and into the evening hours with
storms of similar strength. I think the biggest concerns will be
the gusty winds and very localized flooding throughout today as
storm motions will be slow.

&&

.AVIATION...
12Z TAF DISCUSSION.

There were a few rogue thunderstorms on the radar scope early this
morning, mainly in the CSV area. However, other thunderstorms were
looming to our northwest, across southwestern Kentucky, and poised
to work their way into the Mid-State later this morning. The trend
will be for thunderstorm coverage to increase throughout the day,
especially during the late morning and afternoon hours.

Outside of thunderstorms, you can expect VFR conditions. However,
flight conditions will likely lower to MVFR and possibly even IFR
conditions when heavier showers and storms move near or across
area terminals.

Conditions should return to VFR overnight, as thunderstorm
activity slackens, especially over the extreme north in vicinity
of CKV. However, by late night, believe MVFR ceilings could return
to CSV.

&&

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

&&

DISCUSSION......Unger
AVIATION........19

Hazardous weather outlook, Jul 6, 6:22 AM CDT, 4 hours 51 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
622 AM CDT Fri Jul 6 2018

TNZ005>011-023>034-056>066-075-077>080-093>095-071130-
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-
622 AM CDT Fri Jul 6 2018

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...Today and Tonight

Thunderstorms are likely today and early this evening. Some of
the thunderstorms could be strong with gusty winds and frequent
lightning. Heavy downpours may cause localized flash flooding.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

A few strong thunderstorms are possible Saturday afternoon, mainly
Plateau and south. Gusty winds, frequent lightning, and heavy
downpours are expected.

.SPOTTER INFORMATION STATEMENT...

Storm spotters should report any severe weather or flooding to
the National Weather Service in Nashville.

13

In the hours before

Special weather statement, Jul 6, 8:50 AM CDT, 2 hours 23 minutes before

Special Weather Statement
National Weather Service Nashville TN
850 AM CDT FRI JUL 6 2018

TNZ023-024-061430-
Humphreys TN-Houston TN-
850 AM CDT FRI JUL 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN HOUSTON AND NORTHERN
HUMPHREYS COUNTIES UNTIL 930 AM CDT...

At 849 AM CDT, Doppler radar was tracking a strong thunderstorm 10
miles east of Springville, or 11 miles southeast of Paris Landing
State Park, moving southeast at 20 mph.

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

Locations impacted include...
Waverly, New Johnsonville, Tennessee Ridge and Houston County
Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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 3600 8800 3603 8800 3612 8792 3617 8792
      3618 8793 3622 8795 3628 8795 3635 8798
      3635 8794 3633 8787 3633 8781 3606 8764
      3594 8800 3595 8801 3597 8802
TIME...MOT...LOC 1349Z 331DEG 17KT 3629 8798

27

Special weather statement, Jul 6, 10:32 AM CDT, 41 minutes before

Special Weather Statement
National Weather Service Nashville TN
1032 AM CDT FRI JUL 6 2018

TNZ025>027-059-061615-
Williamson TN-Dickson TN-Davidson TN-Cheatham TN-
1032 AM CDT FRI JUL 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN DAVIDSON...SOUTHEASTERN
DICKSON...NORTHWESTERN WILLIAMSON AND CHEATHAM COUNTIES UNTIL 1115 AM
CDT...

At 1032 AM CDT, Doppler radar was tracking a strong thunderstorm near
Kingston Springs, or near Ashland City, moving southeast at 25 mph.

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

Locations impacted include...
Franklin, Ashland City, Nashville, Brentwood, Goodlettsville, Forest
Hills, White Bluff, Belle Meade, Kingston Springs, Pegram, Burns,
Bellevue, Fairview, Joelton, Pleasant View, Bells Bend, Whites Creek,
Natchez Trace At Highway 96, Beaman Park and Leipers Fork.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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 3634 8672 3633 8670 3586 8694 3602 8728
      3637 8714
TIME...MOT...LOC 1532Z 302DEG 24KT 3619 8710

27

Special weather statement, Jul 6, 11:00 AM CDT, 13 minutes before

Special Weather Statement
National Weather Service Nashville TN
1100 AM CDT FRI JUL 6 2018

TNZ057-058-061645-
Hickman TN-Lewis TN-
1100 AM CDT FRI JUL 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR LEWIS AND SOUTH CENTRAL HICKMAN
COUNTIES UNTIL 1145 AM CDT...

At 1100 AM CDT, Doppler radar was tracking a strong thunderstorm near
Hohenwald, moving southeast at 10 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Hohenwald, Gordonsburg and Kimmins.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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 3555 8767 3557 8765 3560 8766 3570 8743
      3563 8734 3562 8735 3559 8735 3557 8732
      3555 8732 3555 8729 3552 8728 3551 8728
      3543 8761 3544 8761 3544 8765 3547 8765
      3548 8769
TIME...MOT...LOC 1600Z 317DEG 10KT 3561 8752

27

Special weather statement, Jul 6, 11:13 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Nashville TN
1113 AM CDT FRI JUL 6 2018

TNZ008-026-027-059-061700-
Williamson TN-Davidson TN-Cheatham TN-Sumner TN-
1113 AM CDT FRI JUL 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR DAVIDSON...SOUTHWESTERN SUMNER...
WILLIAMSON AND NORTHEASTERN CHEATHAM COUNTIES UNTIL NOON CDT...

At 1112 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Joelton to Belle Meade to 6 miles west of
Thompson's Station. Movement was east at 20 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Franklin, Ashland City, Nashville, Madison, Hendersonville,
Brentwood, La Vergne, Spring Hill, Goodlettsville, Millersville,
Nolensville, Forest Hills, Oak Hill, Coopertown, Belle Meade,
Lakewood, Thompson's Station, Ridgetop, Hermitage and Bellevue.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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

&&

LAT...LON 3632 8655 3624 8659 3607 8652 3606 8653
      3607 8653 3609 8655 3597 8662 3584 8660
      3575 8670 3571 8669 3570 8677 3578 8693
      3582 8711 3610 8698 3640 8702 3637 8698
      3639 8689 3635 8682 3642 8675 3642 8656
TIME...MOT...LOC 1612Z 282DEG 18KT 3635 8692 3609 8686 3583 8702

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 7:03 PM CDT	Areal Flood Advisory	OHX	Maury, Williamson	117 min
Jul 5, 7:16 PM CDT	Special Weather Statement	OHX	Maury	44 min
Jul 5, 7:54 PM CDT	Special Weather Statement	OHX	Maury	51 min
Jul 5, 8:50 PM CDT	Special Weather Statement	OHX	Williamson	40 min
Jul 5, 9:31 PM CDT	Special Weather Statement	OHX	Grundy	29 min
Jul 5, 10:01 PM CDT	Special Weather Statement	OHX	Davidson	29 min
Jul 5, 10:07 PM CDT	Special Weather Statement	OHX	Dickson	23 min
Jul 5, 10:35 PM CDT	Special Weather Statement	OHX	Davidson	25 min
Jul 6, 12:29 AM CDT	Special Weather Statement	OHX	Giles	46 min
Jul 6, 8:50 AM CDT	Special Weather Statement	OHX	Humphreys	40 min
Jul 6, 10:32 AM CDT	Special Weather Statement	OHX	Cheatham, Davidson	43 min
Jul 6, 11:00 AM CDT	Special Weather Statement	OHX	Lewis	45 min
Jul 6, 11:21 AM CDT	Areal Flood Advisory	OHX	Cheatham, Dickson	114 min
Jul 6, 11:39 AM CDT	Special Weather Statement	OHX	Maury	36 min
Jul 6, 11:55 AM CDT	Areal Flood Advisory	OHX	Davidson	3 hr
Jul 6, 11:58 AM CDT	Special Weather Statement	OHX	Bedford, Marshall, Rutherford	47 min
Jul 6, 12:43 PM CDT	Special Weather Statement	OHX	Bedford, Cannon, Coffee, Warren	47 min
Jul 6, 1:16 PM CDT	Special Weather Statement	OHX	DeKalb	44 min
Jul 6, 2:34 PM CDT	Areal Flood Advisory	OHX	Cannon, DeKalb	3 hr
Jul 6, 5:03 PM CDT	Special Weather Statement	OHX	Cheatham	27 min
Jul 6, 5:14 PM CDT	Areal Flood Advisory	OHX	Jackson	2 hr
Jul 6, 5:31 PM CDT	Special Weather Statement	OHX	Cheatham	29 min

Nearby

Special Weather Statements in Tennessee, 2018 Every special weather statement in 2018

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.