Alert archive / Tennessee / Special Weather Statements in 2017

Special Weather Statement, NWS Nashville, TN

April 30, 2017Davidson County, Tennessee

NWS Nashville, TN issued this special weather statement at Apr 30, 2017, 2:39 PM CDT for Davidson County, Tennessee. It was in force for 51 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: Apr 30, 2017, 2:39 PM CDT (19:39 UTC)
Expired: Apr 30, 2017, 3:30 PM CDT
In force: 51 min
Issued by: NWS Nashville, TN

County Davidson County, TN

The radar

The Nashville radar (KOHX), 26 km from the middle of the area, began a volume at 19:38 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, 7.7 hours before the alert went out and 30 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: 329 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 815 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 231 m²/s²
0-3 km storm-relative helicity: 284 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.0

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 Apr 30, 2:14 PM CDT, 25 minutes earlier.

Area forecast discussion, Apr 30, 2:14 PM CDT, 25 minutes before

Area Forecast Discussion
National Weather Service Nashville TN
214 PM CDT Sun Apr 30 2017

.UPDATE...
FOR 18Z AVIATION DISCUSSION.

&&

.DISCUSSION...

Quick update this morning to get a better handle on precip timing
for this afternoon through the overnight hours. A few short term
models such as the HRRR want to bring precip in a bit earlier,
even having some showers and thunderstorms in the Nashville area
by 2-3 pm. Model consensus has things speeding up just a little
bit, so adjusted pops to match. Winds will remain strong through
the Wind Advisory period, and even increased winds slightly
through the I-65 corridor and west for the afternoon.

Also tossed in severe mention mainly west of I-65 during the
afternoon and early evening, but instability falls off rapidly
after 7pm so didn't extend wording much after that. With increased
cloud cover the potential for severe would appear to drop
slightly, but out west with current convection this morning,
storms are not having an issue becoming severe and even producing
isolated tornadoes. So for now the forecast looks to be on track
for today and tonight.

&&

.AVIATION...
18Z TAF DISCUSSION.

Strong winds will continue across the region into this evening
thanks to strong gradient and mixing, but will decrease some later
this evening. Expect band of showers and storms to sweep across
Middle TN...with arrival 19-20Z CKV, 20Z BNA and after 00Z CSV.
Expect additional areas of showers and isolated storms after the
main band passes...and continuing until about 06Z CKV/BNA...but
lingering until after 12Z at CSV. Becoming VFR Monday
morning...though expect gusty winds again most of the day.

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
Wind Advisory until 10 PM CDT this evening FOR Bedford-Cannon-
Cheatham-Clay-Coffee-Davidson-De Kalb-Dickson-Giles-Hickman-
Houston-Humphreys-Jackson-Lawrence-Lewis-Macon-Marshall-Maury-
Montgomery-Perry-Robertson-Rutherford-Smith-Stewart-Sumner-
Trousdale-Wayne-Williamson-Wilson.

&&

DISCUSSION......Barnwell
AVIATION........49

Hazardous weather outlook, Apr 30, 5:03 AM CDT, 9 hours 36 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
503 AM CDT Sun Apr 30 2017

TNZ005>011-023>034-056>066-075-077>080-093>095-011015-
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-
503 AM CDT Sun Apr 30 2017

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...Today and Tonight
Widespread thunderstorms are expected to move across middle
Tennessee this afternoon and evening. Some storms may be strong to
severe...with damaging winds...hail...and a possible tornado...especially
west of interstate 65. Storms could also contain heavy
rainfall...especially across southern middle Tennessee with the
additional threat of isolated flash flooding.

In addition to thunderstorms, the front will bring strong gusty
winds. A wind advisory is valid for locations outside of the
plateau from 10 am until 10 pm. Winds gusts to 40 mph will be
possible.

.DAYS TWO THROUGH SEVEN...Monday through Saturday
No hazardous weather expected at this time.

.SPOTTER INFORMATION STATEMENT...
Spotter activation may be needed this afternoon and tonight.

Spotter Thunderstorm Reporting Criteria
Tornado
Funnel Cloud
Flooding
Hail >= 1/2 inch
Winds > 50 MPH (Measured)
Structural Damage
Trees or Power Lines Down

In the hours before

Special weather statement, Apr 30, 2:18 PM CDT, 21 minutes before

Special Weather Statement
National Weather Service Nashville TN
218 PM CDT SUN APR 30 2017

TNZ026-027-059-301945-
Williamson TN-Davidson TN-Cheatham TN-
218 PM CDT SUN APR 30 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN DAVIDSON...
NORTHWESTERN WILLIAMSON AND SOUTH CENTRAL CHEATHAM COUNTIES UNTIL 245
PM CDT...

At 217 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles southwest of Fairview, or 15 miles west of Franklin, moving
northeast at 50 mph.

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

Locations impacted include...
Franklin, Brentwood, Forest Hills, Oak Hill, Belle Meade, Kingston
Springs, Pegram, Fairview, Bellevue, Leipers Fork and Natchez Trace
At Highway 96.

A tornado watch remains in effect until 700 PM CDT for Middle
Tennessee.

LAT...LON 3603 8678 3580 8707 3584 8717 3591 8721
      3594 8720 3594 8721 3596 8720 3597 8721
      3598 8719 3598 8720 3599 8719 3605 8718
      3607 8717 3610 8717 3624 8710
TIME...MOT...LOC 1917Z 224DEG 44KT 3594 8712

Whitehead

Special weather statement, Apr 30, 2:28 PM CDT, 11 minutes before

Special Weather Statement
National Weather Service Nashville TN
228 PM CDT SUN APR 30 2017

TNZ060-061-095-302015-
Maury TN-Giles TN-Marshall TN-
228 PM CDT SUN APR 30 2017

...SIGNIFICANT WEATHER ADVISORY FOR MARSHALL...SOUTHEASTERN MAURY AND
GILES COUNTIES UNTIL 315 PM CDT...

At 227 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Columbia to near Ardmore. Movement was
northeast at 40 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations impacted include...
Lewisburg, Pulaski, Chapel Hill, Ardmore, Cornersville, Elkton, Minor
Hill, Lynnville, Culleoka, Goodspring, Belfast, Frankewing, Prospect
and Farmington.

A tornado watch remains in effect until 700 PM CDT for Middle
Tennessee.

LAT...LON 3500 8717 3507 8722 3515 8720 3517 8722
      3550 8716 3565 8682 3570 8681 3571 8668
      3569 8664 3558 8666 3558 8663 3557 8665
      3546 8667 3538 8663 3536 8660 3533 8660
      3531 8668 3525 8675 3526 8683 3499 8684
TIME...MOT...LOC 1927Z 230DEG 35KT 3512 8710 3491 8687

Shamburger

Local storm report, Apr 30, 2:30 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
230 PM CDT SUN APR 30 2017

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

0151 PM     TSTM WND DMG     3 S LAWRENCEBURG        35.20N  87.34W
04/30/2017                   LAWRENCE           TN   EMERGENCY MNGR

            2 FEET DIAMETER OAK TREE SNAPPED JUST SOUTH OF HWY 43
            AND HWY 64 INTERSECTION

0153 PM     TSTM WND DMG     ETHRIDGE                35.32N  87.30W
04/30/2017                   LAWRENCE           TN   EMERGENCY MNGR

            TWO NORTHBOUND LANES OF HIGHWAY 43 BLOCKED BY TREE
            ACROSS THE ROADWAY

&&

EVENT NUMBER OHX1700497
EVENT NUMBER OHX1700498

SHAMBURGER

Special weather statement, Apr 30, 2:39 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Nashville TN
239 PM CDT SUN APR 30 2017

TNZ026-027-302030-
Davidson TN-Cheatham TN-
239 PM CDT SUN APR 30 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN DAVIDSON AND
SOUTHEASTERN CHEATHAM COUNTIES UNTIL 330 PM CDT...

At 238 PM CDT, Doppler radar was tracking a strong thunderstorm near
Bellevue, or 10 miles west of Nashville, moving northeast at 45 mph.

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

Locations impacted include...
Ashland City, Nashville, Madison, Goodlettsville, Pegram, Bellevue,
Joelton, Beaman Park, Bells Bend and Whites Creek.

A tornado watch remains in effect until 700 PM CDT for Middle
Tennessee.

LAT...LON 3637 8688 3637 8686 3638 8686 3637 8685
      3635 8682 3636 8680 3630 8667 3629 8664
      3628 8664 3605 8695 3614 8705 3639 8694
      3638 8693 3639 8689
TIME...MOT...LOC 1938Z 220DEG 39KT 3613 8697

Whitehead

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 29, 7:26 PM CDT	Special Weather Statement	OHX	Putnam, White	34 min
Apr 29, 7:35 PM CDT	Special Weather Statement	OHX	DeKalb	25 min
Apr 29, 7:52 PM CDT	Special Weather Statement	OHX	Clay, Jackson, Overton	38 min
Apr 29, 7:56 PM CDT	Special Weather Statement	OHX	DeKalb, Jackson, Smith	49 min
Apr 29, 8:08 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Jackson, Overton	21 min
Apr 30, 2:12 AM CDT	Wind Advisory	OHX	Bedford, Cannon, Cheatham, Clay, Coffee, Davidson and 23 more	19 hr
Apr 30, 1:29 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence, Wayne	31 min
Apr 30, 2:13 PM CDT	Severe Thunderstorm Warning	OHX	Maury	32 min
Apr 30, 2:18 PM CDT	Special Weather Statement	OHX	Williamson	27 min
Apr 30, 2:28 PM CDT	Special Weather Statement	OHX	Giles, Marshall	47 min
Apr 30, 2:28 PM CDT	Severe Thunderstorm Warning	OHX	Maury, Williamson	32 min
Apr 30, 2:42 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Marshall, Maury	20 min
Apr 30, 2:48 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Williamson	27 min
Apr 30, 3:01 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Marshall	29 min
Apr 30, 3:04 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Sumner, Wilson	26 min
Apr 30, 3:14 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Williamson, Wilson	31 min
Apr 30, 3:26 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Rutherford	34 min
Apr 30, 3:29 PM CDT	Severe Thunderstorm Warning	OHX	Macon, Sumner, Trousdale	31 min
Apr 30, 3:43 PM CDT	Special Weather Statement	OHX	Wilson	32 min
Apr 30, 3:56 PM CDT	Special Weather Statement	OHX	Cannon, Coffee, DeKalb, Grundy, Warren	49 min
Apr 30, 4:11 PM CDT	Severe Thunderstorm Warning	OHX	Grundy	49 min
Apr 30, 4:28 PM CDT	Special Weather Statement	OHX	DeKalb, Putnam, Van Buren, Warren, White	62 min
Apr 30, 4:46 PM CDT	Special Weather Statement	OHX	Jackson	29 min
Apr 30, 4:50 PM CDT	Special Weather Statement	OHX	Jackson	40 min
Apr 30, 4:57 PM CDT	Severe Thunderstorm Warning	OHX	Jackson, Overton, Putnam	33 min
Apr 30, 5:07 PM CDT	Severe Thunderstorm Warning	OHX	Clay	23 min
Apr 30, 5:26 PM CDT	Special Weather Statement	OHX	Overton, Pickett	49 min
Apr 30, 5:28 PM CDT	Special Weather Statement	OHX	Cumberland, Fentress	62 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.