Alert archive / Tennessee / Special Weather Statements in 2019

Special Weather Statement, NWS Nashville, TN

August 2, 2019Williamson County, Tennessee

NWS Nashville, TN issued this special weather statement at Aug 2, 2019, 8:32 PM CDT for Williamson County, Tennessee. It was in force for 43 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: Aug 2, 2019, 8:32 PM CDT (01:32 UTC)
Expired: Aug 2, 2019, 9:15 PM CDT
In force: 43 min
Issued by: NWS Nashville, TN

County Williamson County, TN

The radar

The Nashville radar (KOHX), 33 km from the middle of the area, began a volume at 01:35 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, 1.5 hours before the alert went out and 22 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: 101 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1999 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 4 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 Aug 2, 7:52 PM CDT, 40 minutes earlier.

Area forecast discussion, Aug 2, 7:52 PM CDT, 40 minutes before

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Hazardous weather outlook, Aug 2, 5:00 AM CDT, 15 hours 32 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
500 AM CDT Fri Aug 2 2019

TNZ005>011-023>034-056>066-075-077>080-093>095-031000-
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-
500 AM CDT Fri Aug 2 2019

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...Today and Tonight

Scattered thunderstorms are expected today and this evening.
The storms will move slowly, so a few spots could have enough
rainfall to produce brief flooding. Gusty winds are also possible
with the stronger storms.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Scattered thunderstorms are expected each day through the weekend.
The storms could produce brief localized flooding. Gusty winds are
possible with the stronger storms.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

13

In the hours before

Special weather statement, Aug 2, 6:31 PM CDT, 2 hours 1 minute before

Special Weather Statement
National Weather Service Nashville TN
631 PM CDT Fri Aug 2 2019

TNZ030-031-030000-
Jackson TN-Smith TN-
631 PM CDT Fri Aug 2 2019

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL SMITH AND
SOUTHWESTERN JACKSON COUNTIES UNTIL 700 PM CDT...

At 630 PM CDT, Doppler radar was tracking a strong thunderstorm 9
miles east of Carthage, moving southwest at 15 mph.

Pea size hail will be possible with this storm.

Locations impacted include...
Granville.

LAT...LON 3627 8573 3624 8577 3625 8578 3623 8578
      3619 8584 3627 8592 3631 8577
TIME...MOT...LOC 2330Z 061DEG 12KT 3627 8578

21

Special weather statement, Aug 2, 7:15 PM CDT, 1 hour 17 minutes before

Special Weather Statement
National Weather Service Nashville TN
715 PM CDT Fri Aug 2 2019

TNZ028-030-030045-
Wilson TN-Smith TN-
715 PM CDT Fri Aug 2 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN SMITH AND CENTRAL
WILSON COUNTIES UNTIL 745 PM CDT...

At 714 PM CDT, Doppler radar was tracking a strong thunderstorm near
Watertown, or 9 miles southwest of Carthage, moving southwest at 35
mph.

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

Locations impacted include...
Lebanon, Watertown, Gordonsville, Hickman, Alexandria, Cedars Of
Lebanon State Park and Tuckers Crossroads.

This includes the following highways...
 Interstate 40 between mile markers 231 and 258.
 Interstate 840 between mile markers 72 and 76.

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 3613 8591 3610 8595 3611 8596 3609 8599
      3608 8603 3609 8606 3607 8606 3607 8605
      3604 8605 3596 8619 3597 8622 3596 8624
      3598 8630 3621 8645 3629 8601
TIME...MOT...LOC 0014Z 062DEG 29KT 3617 8607

21

Local storm report, Aug 2, 7:39 PM CDT, 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
739 PM CDT FRI AUG 02 2019

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

0655 PM     TSTM WND DMG     5 SW CASTALIAN SPRINGS  36.33N  86.37W
08/02/2019                   WILSON             TN   NWS EMPLOYEE

            8 TO 10 INCH TREE LIMBS BROKEN. ESTIMATED WIND SPEED
            AROUND 50 MPH.

&&

EVENT NUMBER OHX1900461

JB

Special weather statement, Aug 2, 7:49 PM CDT, 43 minutes before

Special Weather Statement
National Weather Service Nashville TN
749 PM CDT Fri Aug 2 2019

TNZ028-030115-
Wilson TN-
749 PM CDT Fri Aug 2 2019

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL WILSON COUNTY UNTIL 815
PM CDT...

At 748 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Lebanon to near Watertown. Movement was
southwest at 15 mph.

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

Locations impacted include...
Lebanon and Watertown.

This includes the following highways...
 Interstate 40 between mile markers 233 and 241.
 Interstate 840 between mile markers 73 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3610 8612 3600 8623 3617 8644 3623 8629
TIME...MOT...LOC 0048Z 058DEG 12KT 3620 8633 3606 8615

21

Special weather statement, Aug 2, 8:04 PM CDT, 28 minutes before

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Special weather statement, Aug 2, 8:32 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
Aug 2, 7:15 PM CDT	Special Weather Statement	OHX	Wilson	30 min
Aug 2, 7:49 PM CDT	Special Weather Statement	OHX	Wilson	26 min
Aug 2, 8:04 PM CDT	Special Weather Statement	OHX	Davidson	26 min
Aug 2, 8:29 PM CDT	Areal Flood Advisory	OHX	Davidson, Rutherford, Williamson, Wilson	3 hr
Aug 2, 9:14 PM CDT	Special Weather Statement	OHX	Williamson	31 min
Aug 2, 9:46 PM CDT	Special Weather Statement	OHX	Williamson	44 min
Aug 3, 3:51 PM CDT	Special Weather Statement	OHX	Montgomery	39 min
Aug 3, 4:10 PM CDT	Areal Flood Advisory	OHX	Montgomery	2 hr
Aug 3, 4:54 PM CDT	Special Weather Statement	OHX	Cheatham	51 min
Aug 3, 5:22 PM CDT	Special Weather Statement	OHX	Davidson	38 min
Aug 3, 5:46 PM CDT	Special Weather Statement	OHX	Davidson, Williamson	44 min
Aug 3, 5:58 PM CDT	Areal Flood Advisory	OHX	Wayne	2 hr
Aug 3, 6:02 PM CDT	Areal Flood Advisory	OHX	Davidson, Williamson	118 min
Aug 3, 6:38 PM CDT	Special Weather Statement	OHX	Davidson	52 min
Aug 3, 6:50 PM CDT	Areal Flood Advisory	OHX	Davidson	115 min

Nearby

Special Weather Statements in Tennessee, 2019 Every special weather statement in 2019

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.