Alert archive / Tennessee / Special Weather Statements in 2017

Special Weather Statement, NWS Nashville, TN

April 5, 2017Sumner County, Tennessee

NWS Nashville, TN issued this special weather statement at Apr 5, 2017, 3:39 PM CDT for Sumner County, Tennessee. It was in force for 36 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 5, 2017, 3:39 PM CDT (20:39 UTC)
Expired: Apr 5, 2017, 4:15 PM CDT
In force: 36 min
Issued by: NWS Nashville, TN

County Sumner County, TN

The radar

The Nashville radar (KOHX), 31 km from the middle of the area, began a volume at 20:43 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, 8.7 hours before the alert went out and 44 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1902 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 161 m²/s²
0-3 km storm-relative helicity: 208 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 Apr 5, 2:00 PM CDT, 1 hour 39 minutes earlier.

Area forecast discussion, Apr 5, 2:00 PM CDT, 1 hour 39 minutes before

Area Forecast Discussion
National Weather Service Nashville TN
200 PM CDT Wed Apr 5 2017

.UPDATE...
FOR 18Z AVIATION DISCUSSION.

&&

.DISCUSSION...

Severe risk remains in tact today...largely around the I-65
corridor and east. Storms expected to be near TN river around
1pm, then march east into the early evening. SFC analysis showing
trough axis moving toward the TN river now, with surge of 60+
dews ahead. latest runs also showing CAPE up near 2000, with SRH
200-300...with slightly higher values east. Added severe wording
to afternoon. Will raised temp slightly and may need to bump up
little more in spots with strong WAA occurring. Wind gust to
25mph to expected this afternoon.

&&

.AVIATION...
18Z TAF DISCUSSION.

Band of strong afternoon/early evening storms, followed by dry
period, then wrap-around dz-/rw- on tap this period. Outside
of convection early through 06z, largely expect VFR conditions.
After 06z, upper low will wrap-around light precip and cigs
expected to drop all sites overnight but possibly improve by
18z Thu. Winds will be quite gusty through the period...sometimes
25-35mph.

&&

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

&&

DISCUSSION......49
AVIATION........07

Hazardous weather outlook, Apr 5, 5:18 AM CDT, 10 hours 21 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
518 AM CDT Wed Apr 5 2017

TNZ005>011-023>034-056>066-075-077>080-093>095-061000-
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-
518 AM CDT Wed Apr 5 2017

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...Today and Tonight

Some strong to severe thunderstorms will be possible
this afternoon through the early evening hours, especially
for locations east of I-65. Main concerns with any strong
to severe thunderstorms that do develop will be large hail,
damaging winds, and the formation of tornadoes.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed this afternoon
and early evening.

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

31

In the hours before

Special weather statement, Apr 5, 3:39 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Nashville TN
339 PM CDT WED APR 5 2017

TNZ007-008-027-052115-
Robertson TN-Davidson TN-Sumner TN-
339 PM CDT WED APR 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL DAVIDSON...CENTRAL
SUMNER AND SOUTHEASTERN ROBERTSON COUNTIES UNTIL 415 PM CDT...

At 339 PM CDT, Doppler radar was tracking a strong thunderstorm over
Millersville, or 11 miles southeast of Springfield, moving northeast
at 50 mph.

Dime size hail will be possible with this storm.

Locations impacted include...
Goodlettsville, White House, Millersville, Greenbrier, Ridgetop,
Cross Plains, Portland, Orlinda, Cottontown and Oak Grove.

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

LAT...LON 3664 8641 3651 8625 3629 8677 3633 8682
      3639 8688 3663 8655 3663 8654 3664 8651
TIME...MOT...LOC 2039Z 230DEG 45KT 3639 8673

10

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 3:51 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Coffee	39 min
Apr 5, 3:54 PM CDT	Special Weather Statement	OHX	Robertson	21 min
Apr 5, 4:02 PM CDT	Wind Advisory	OHX	Bedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 32 more	29 hr
Apr 5, 4:10 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Rutherford, Wilson	35 min
Apr 5, 4:15 PM CDT	Special Weather Statement	OHX	Sumner	30 min
Apr 5, 4:18 PM CDT	Tornado Warning	OHX	Coffee	27 min
Apr 5, 4:27 PM CDT	Special Weather Statement	OHX	Smith	33 min
Apr 5, 4:29 PM CDT	Special Weather Statement	OHX	Smith	31 min
Apr 5, 4:29 PM CDT	Severe Thunderstorm Warning	OHX	Coffee, Warren	46 min
Apr 5, 4:36 PM CDT	Severe Thunderstorm Warning	OHX	Jackson, Macon, Smith	24 min
Apr 5, 4:47 PM CDT	Special Weather Statement	OHX	Trousdale	28 min
Apr 5, 4:51 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Jackson, Macon, Smith	24 min
Apr 5, 4:54 PM CDT	Tornado Warning	OHX	Grundy, Van Buren, Warren	36 min
Apr 5, 4:59 PM CDT	Severe Thunderstorm Warning	OHX	Coffee, Grundy, Warren	31 min
Apr 5, 5:06 PM CDT	Special Weather Statement	OHX	Putnam	24 min
Apr 5, 5:10 PM CDT	Tornado Warning	OHX	Putnam	21 min
Apr 5, 5:12 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Jackson, Macon	33 min
Apr 5, 5:14 PM CDT	Special Weather Statement	OHX	Macon, Smith	31 min
Apr 5, 5:22 PM CDT	Severe Thunderstorm Warning	OHX	Cannon, Coffee, DeKalb, Warren, White	23 min
Apr 5, 5:26 PM CDT	Tornado Warning	OHX	Overton, Putnam	18 min
Apr 5, 5:38 PM CDT	Special Weather Statement	OHX	DeKalb	37 min
Apr 5, 5:41 PM CDT	Special Weather Statement	OHX	Grundy, Van Buren	49 min
Apr 5, 5:46 PM CDT	Special Weather Statement	OHX	Cannon, DeKalb	44 min
Apr 5, 5:55 PM CDT	Special Weather Statement	OHX	Grundy	35 min
Apr 5, 5:58 PM CDT	Special Weather Statement	OHX	Overton	32 min
Apr 5, 6:08 PM CDT	Special Weather Statement	OHX	Fentress, Overton, Pickett, Putnam	37 min
Apr 5, 6:12 PM CDT	Severe Thunderstorm Warning	OHX	Clay, DeKalb, Jackson, Overton, Putnam	33 min
Apr 5, 6:42 PM CDT	Special Weather Statement	OHX	Overton	48 min
Apr 5, 6:58 PM CDT	Special Weather Statement	OHX	White	32 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.