Alert archive / Tennessee / Special Weather Statements in 2017

Special Weather Statement, NWS Morristown, TN

May 4, 20175 counties in Tennessee

NWS Morristown, TN issued this special weather statement at May 4, 2017, 8:02 PM EDT for 5 counties in Tennessee. It was in force for 58 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 4, 2017, 8:02 PM EDT (00:02 UTC)
Expired: May 4, 2017, 9:00 PM EDT
In force: 58 min
Issued by: NWS Morristown, TN

Counties Campbell County, TN, Claiborne County, TN, Grainger County, TN, Knox County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 28 km from the middle of the area, began a volume at 00:04 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, 0.0 hours before the alert went out and 264 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: 13 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 616 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -125 m²/s²
0-3 km storm-relative helicity: -273 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.3

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 Morristown, TN wrote its last area forecast discussion before this special weather statement went out at May 4, 7:47 PM EDT, 15 minutes earlier.

Area forecast discussion, May 4, 7:47 PM EDT, 15 minutes before

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Hazardous weather outlook, May 4, 3:48 PM EDT, 4 hours 14 minutes before

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In the hours before

Local storm report, May 4, 4:18 PM EDT, 3 hours 44 minutes before

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Local storm report, May 4, 4:46 PM EDT, 3 hours 16 minutes before

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Local storm report, May 4, 6:47 PM EDT, 1 hour 15 minutes before

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Special weather statement, May 4, 7:13 PM EDT, 49 minutes before

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Special weather statement, May 4, 7:25 PM EDT, 37 minutes before

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Special weather statement, May 4, 8:02 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Morristown TN
802 PM EDT THU MAY 4 2017

TNZ013-014-036>038-069-050100-
Anderson-Claiborne-Campbell-Union-Knox-Grainger-
802 PM EDT THU MAY 4 2017

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CLAIBORNE...EASTERN
KNOX...NORTHEASTERN ANDERSON...CAMPBELL...GRAINGER AND UNION
COUNTIES...

At 802 PM EDT, radar indicated strong thunderstorms were located
along a line extending from 10 miles south of Zion Hill to near
Knoxville. Movement was northeast at 45 mph.

Winds in excess of 40 mph and pea size hail are possible with these
storms.

Locations impacted include...
Knoxville, Clinton, La Follette, Maynardville, Rutledge, New
Tazewell, Bean Station, Tazewell, Plainview, Jacksboro, Pruden,
Harrogate, Jellico, Caryville, Halls, Blaine, Lake City, Norris,
Luttrell and Lone Mountain.

LAT...LON 3660 8347 3652 8339 3641 8339 3639 8328
      3629 8326 3626 8328 3628 8336 3617 8348
      3619 8356 3614 8364 3610 8363 3612 8367
      3609 8366 3608 8371 3601 8367 3588 8387
      3646 8435 3651 8433 3651 8426 3659 8426
TIME...MOT...LOC 0002Z 221DEG 39KT 3647 8430 3604 8392

mjb

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 9:13 PM EDT	Areal Flood Advisory	MRX	Bradley	3 hr
May 4, 9:23 PM EDT	Special Weather Statement	MRX	Loudon, Monroe	67 min
May 4, 9:59 PM EDT	Special Weather Statement	MRX	Anderson, Blount, Knox	46 min
May 4, 10:42 PM EDT	Special Weather Statement	MRX	Claiborne, Grainger, Hamblen, Jefferson, Union	48 min
May 4, 10:55 PM EDT	Areal Flood Advisory	MRX	Loudon, Morgan, Roane	3 hr
May 4, 11:02 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Hamblen, Jefferson, Union	43 min
May 4, 11:27 PM EDT	Severe Thunderstorm Warning	MRX	Hancock, Hawkins, Sullivan	48 min
May 4, 11:54 PM EDT	Special Weather Statement	MRX	Greene, Unicoi, Washington	51 min
May 5, 12:07 AM EDT	Special Weather Statement	MRX	Carter, Hawkins, Sullivan, Washington	38 min
May 4, 10:36 PM EDT	Special Weather Statement	MRX	Clay	24 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.