Alert archive / Tennessee / Special Weather Statements in 2017

Special Weather Statement, NWS Nashville, TN

May 12, 2017White County, Tennessee

NWS Nashville, TN issued this special weather statement at May 12, 2017, 1:52 AM CDT for White County, Tennessee. It was in force for 23 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: May 12, 2017, 1:52 AM CDT (06:52 UTC)
Expired: May 12, 2017, 2:15 AM CDT
In force: 23 min
Issued by: NWS Nashville, TN

County White County, TN

The radar

The Nashville radar (KOHX), 103 km from the middle of the area, began a volume at 06:56 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, 6.9 hours before the alert went out and 104 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: 904 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1372 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 4.2

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 May 11, 11:54 PM CDT, 1 hour 58 minutes earlier.

Area forecast discussion, May 11, 11:54 PM CDT, 1 hour 58 minutes before

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Hazardous weather outlook, May 11, 3:26 PM CDT, 10 hours 26 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
326 PM CDT Thu May 11 2017

TNZ005>011-023>034-056>066-075-077>080-093>095-122030-
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-
326 PM CDT Thu May 11 2017

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...This Afternoon and Tonight.

A few strong to severe storms will be possible tonight between
8 pm and 2 am, generally for areas along and north of I-40. The
main concerns will be damaging winds and large hail. Heavy rains
might also cause some localized flooding issues by Friday
morning.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may become necessary tonight.

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

27

In the hours before

Special weather statement, May 11, 10:15 PM CDT, 3 hours 37 minutes before

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Special weather statement, May 11, 10:17 PM CDT, 3 hours 35 minutes before

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Special weather statement, May 11, 10:19 PM CDT, 3 hours 33 minutes before

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Local storm report, May 11, 10:45 PM CDT, 3 hours 7 minutes before

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Special weather statement, May 11, 11:03 PM CDT, 2 hours 49 minutes before

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Special weather statement, May 12, 1:52 AM 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
May 11, 7:00 PM CDT	Special Weather Statement	OHX	Fentress, Overton, Pickett	60 min
May 11, 7:38 PM CDT	Special Weather Statement	OHX	Macon, Trousdale	52 min
May 11, 8:25 PM CDT	Special Weather Statement	OHX	Jackson, Sumner, Trousdale	50 min
May 11, 8:48 PM CDT	Areal Flood Advisory	OHX	Jackson, Macon, Smith, Sumner, Trousdale	117 min
May 11, 9:37 PM CDT	Special Weather Statement	OHX	Macon, Robertson, Sumner, Trousdale	38 min
May 11, 9:39 PM CDT	Flash Flood Watch	OHX	Cheatham, Dickson, Houston, Humphreys, Macon, Montgomery and 4 more	5 hr
May 11, 9:44 PM CDT	Flash Flood Warning	OHX	Robertson, Sumner	2 hr
May 11, 9:46 PM CDT	Special Weather Statement	OHX	Houston	44 min
May 11, 10:15 PM CDT	Special Weather Statement	OHX	Montgomery, Robertson	45 min
May 11, 10:17 PM CDT	Special Weather Statement	OHX	Sumner	43 min
May 11, 10:19 PM CDT	Special Weather Statement	OHX	Putnam	41 min
May 11, 11:03 PM CDT	Special Weather Statement	OHX	Sumner	42 min
May 11, 11:27 PM CDT	Areal Flood Advisory	OHX	Smith, Sumner, Trousdale, Wilson	2 hr
May 11, 11:37 PM CDT	Areal Flood Warning	OHX	Robertson, Sumner	113 min
May 11, 11:48 PM CDT	Areal Flood Advisory	OHX	Davidson, Sumner, Wilson	117 min
May 12, 12:57 AM CDT	Areal Flood Advisory	OHX	Cannon, DeKalb, Rutherford, Smith, Wilson	2 hr

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.