Alert archive / Tennessee / Special Weather Statements in 2017

Special Weather Statement, NWS Morristown, TN

July 14, 2017Grainger County, Roane County, Union County, Tennessee

NWS Morristown, TN issued this special weather statement at Jul 14, 2017, 2:13 PM EDT for Grainger County, Roane County, Union County, Tennessee. It was in force for 47 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
Jul 14, 2017, 2:13 PM EDT (18:13 UTC)
Expired
Jul 14, 2017, 3:00 PM EDT
In force
47 min
Issued by
NWS Morristown, TN

Counties Grainger County, TN, Roane County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 69 km from the middle of the area, began a volume at 18:14 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, 6.2 hours before the alert went out and 223 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-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2017-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1105 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2017-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1105 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
817 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
20 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 Morristown, TN wrote its last area forecast discussion before this special weather statement went out at Jul 14, 1:19 PM EDT, 54 minutes earlier.

Area forecast discussion, Jul 14, 1:19 PM EDT, 54 minutes before
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Hazardous weather outlook, Jul 14, 3:56 AM EDT, 10 hours 17 minutes before
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In the hours before

Special weather statement, Jul 14, 1:28 PM EDT, 45 minutes before
Special Weather Statement
National Weather Service Morristown TN
128 PM EDT FRI JUL 14 2017

TNZ013>015-035>038-067-069-VAZ001-141815-
Anderson TN-Claiborne TN-Hancock TN-Union TN-Roane TN-Campbell TN-
Grainger TN-Knox TN-Morgan TN-Lee VA-
128 PM EDT FRI JUL 14 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MORGAN...
CLAIBORNE...ANDERSON...NORTHWESTERN KNOX...HANCOCK...CENTRAL
CAMPBELL...NORTHWESTERN GRAINGER...UNION...CENTRAL ROANE AND
SOUTHWESTERN LEE COUNTIES UNTIL 215 PM EDT...

At 127 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Smith to near Spring City. Movement was
southeast at 15 mph.

Winds in excess of 30 mph will be possible with these storms.

Locations impacted include...
Oak Ridge, Clinton, Lenoir City, La Follette, Kingston, Rockwood,
Maynardville, Sneedville, Wartburg, Oliver Springs, New Tazewell,
Tazewell, Plainview, Jacksboro, Midtown, Harrogate, Harriman,
Caryville, Lake City and Norris.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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 3661 8298 3577 8452 3590 8470 3601 8474
      3620 8447 3616 8444 3617 8440 3630 8433
      3659 8392 3658 8369 3667 8352 3667 8342
      3672 8325
TIME...MOT...LOC 1727Z 303DEG 12KT 3668 8325 3574 8487
Special weather statement, Jul 14, 2:13 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Morristown TN
213 PM EDT FRI JUL 14 2017

TNZ014-036>038-067-069-141900-
Anderson TN-Claiborne TN-Union TN-Roane TN-Grainger TN-Knox TN-
213 PM EDT FRI JUL 14 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL CLAIBORNE...CENTRAL
ANDERSON...NORTHERN KNOX...WESTERN GRAINGER...SOUTHERN UNION AND
ROANE COUNTIES UNTIL 300 PM EDT...

At 213 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 8 miles northeast of Maynardville to near
Fairview. Movement was south at 10 to 15 mph.

Half inch hail and winds in excess of 30 mph will be possible with
these storms.

Locations impacted include...
Knoxville, Oak Ridge, Clinton, Kingston, Rockwood, Maynardville,
Rutledge, Fairview, Oliver Springs, Plainview, Midtown, Harriman,
Halls, Blaine, Luttrell, Lone Mountain, Buffalo Springs, Rose Hill,
Big Ridge State Park and Karns.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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 3573 8465 3584 8469 3642 8362 3624 8342
      3618 8356 3619 8356 3618 8357 3588 8425
      3590 8428 3588 8428 3589 8433 3584 8434
      3571 8463
TIME...MOT...LOC 1813Z 351DEG 8KT 3631 8369 3581 8461

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 1:28 PM EDTSpecial Weather StatementMRXAnderson, Campbell, Claiborne, Hancock, Roane, Union47 min
Jul 14, 3:21 PM EDTSpecial Weather StatementMRXBledsoe, Rhea39 min
Jul 14, 3:28 PM EDTAreal Flood AdvisoryMRXBledsoe, Morgan, Rhea, Roane3 hr
Jul 14, 3:44 PM EDTSpecial Weather StatementMRXCarter46 min
Jul 14, 4:07 PM EDTFlash Flood WarningMRXRhea83 min
Jul 14, 4:51 PM EDTAreal Flood AdvisoryMRXMarion, Sequatchie114 min
Jul 14, 5:32 PM EDTSpecial Weather StatementMRXHamilton43 min
Jul 14, 5:39 PM EDTSpecial Weather StatementMRXMcMinn51 min
Jul 14, 3:00 PM EDTSpecial Weather StatementMRXWashington, City of Bristol30 min

Nearby

Special Weather Statements in Tennessee, 2017Every 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.