Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Morristown, TN

March 18, 2021Claiborne County, Tennessee

NWS Morristown, TN issued this special weather statement at Mar 18, 2021, 4:03 PM EDT for Claiborne County, Tennessee. It was in force for 27 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: Mar 18, 2021, 4:03 PM EDT (20:03 UTC)
Expired: Mar 18, 2021, 4:30 PM EDT
In force: 27 min
Issued by: NWS Morristown, TN

County Claiborne County, TN

The radar

The Knoxville radar (KMRX), 40 km from the middle of the area, began a volume at 20:05 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, 8.1 hours before the alert went out and 286 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: -26 J/kg
Mixed-layer LCL: 660 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

954 
WWUS84 KMRX 182003
SPSMRX

Special Weather Statement
National Weather Service Morristown TN
403 PM EDT Thu Mar 18 2021
 
TNZ014-015-182030-
Claiborne TN-Hancock TN-
403 PM EDT Thu Mar 18 2021

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN CLAIBORNE AND
NORTHWESTERN HANCOCK COUNTIES UNTIL 430 PM EDT...

At 403 PM EDT, Doppler radar was tracking a strong thunderstorm over
New Tazewell, or 11 miles north of Rutledge, moving northeast at 35
mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
New Tazewell, Tazewell, Springdale, Lone Mountain, Powell River
Preserve and Sandlick.

LAT...LON 3659 8324 3635 8362 3641 8371 3660 8356
      3660 8327
TIME...MOT...LOC 2003Z 220DEG 28KT 3644 8360 

$$

JLB

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 9:12 PM EDT	Areal Flood Warning	MRX	Bradley, Hamilton, Marion	6 hr
Mar 18, 9:19 AM EDT	Special Weather Statement	MRX	Jefferson	41 min
Mar 18, 9:30 AM EDT	Special Weather Statement	MRX	Grainger, Hancock	45 min
Mar 18, 9:54 AM EDT	River Flood Warning	MRX	Bledsoe, Marion, Sequatchie	33 hr
Mar 18, 10:35 AM EDT	Areal Flood Advisory	MRX	Blount, Claiborne, Grainger, Hancock, Jefferson, Knox	3 hr
Mar 18, 11:15 AM EDT	Special Weather Statement	MRX	Sullivan, Washington	45 min
Mar 18, 11:28 AM EDT	Areal Flood Advisory	MRX	Hancock	3 hr
Mar 18, 12:59 PM EDT	Special Weather Statement	MRX	Campbell	46 min
Mar 18, 1:13 PM EDT	Special Weather Statement	MRX	Anderson	47 min
Mar 18, 1:19 PM EDT	Special Weather Statement	MRX	Greene	41 min
Mar 18, 1:42 PM EDT	Special Weather Statement	MRX	Anderson, Union	48 min
Mar 18, 1:52 PM EDT	Special Weather Statement	MRX	Greene, Sullivan, Washington	53 min
Mar 18, 2:07 PM EDT	Special Weather Statement	MRX	Claiborne	23 min
Mar 18, 2:12 PM EDT	Special Weather Statement	MRX	Campbell	48 min
Mar 18, 2:23 PM EDT	Special Weather Statement	MRX	Claiborne	52 min
Mar 18, 2:36 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Hancock, Union	39 min
Mar 18, 3:02 PM EDT	Special Weather Statement	MRX	Knox	43 min
Mar 18, 3:12 PM EDT	Special Weather Statement	MRX	Union	48 min
Mar 18, 3:13 PM EDT	Special Weather Statement	MRX	Hancock	47 min
Mar 18, 3:19 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Hancock	41 min
Mar 18, 4:02 PM EDT	Special Weather Statement	MRX	Campbell	43 min
Mar 18, 4:14 PM EDT	Special Weather Statement	MRX	Claiborne	46 min
Mar 18, 4:23 PM EDT	Special Weather Statement	MRX	Unicoi	37 min
Mar 18, 4:50 PM EDT	Special Weather Statement	MRX	Carter	25 min
Mar 18, 5:13 PM EDT	Special Weather Statement	MRX	Jefferson	32 min
Mar 18, 6:08 PM EDT	Special Weather Statement	MRX	Hawkins	37 min
Mar 18, 6:41 PM EDT	Special Weather Statement	MRX	Hawkins	34 min
Mar 18, 7:04 PM EDT	Special Weather Statement	MRX	Carter	26 min
Mar 18, 7:40 PM EDT	Areal Flood Advisory	MRX	Greene, Hawkins	3 hr
Mar 18, 7:42 PM EDT	Severe Thunderstorm Warning	MRX	Johnson	26 min
Mar 18, 4:25 PM EDT	Special Weather Statement	MRX	City of Norton	35 min
Mar 18, 4:40 PM EDT	Special Weather Statement	MRX	Russell	35 min
Mar 18, 5:30 PM EDT	Special Weather Statement	MRX	Washington	30 min
Mar 18, 5:56 PM EDT	Special Weather Statement	MRX	Washington	34 min
Mar 18, 7:37 PM EDT	Special Weather Statement	MRX	Washington	38 min

Nearby

Special Weather Statements in Tennessee, 2021 Every special weather statement in 2021

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.