Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Morristown, TN

March 18, 2021Campbell County, Tennessee

NWS Morristown, TN issued this special weather statement at Mar 18, 2021, 4:02 PM EDT for Campbell County, Tennessee. It was in force for 43 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, 4:02 PM EDT (20:02 UTC)
Expired: Mar 18, 2021, 4:45 PM EDT
In force: 43 min
Issued by: NWS Morristown, TN

County Campbell County, TN

The radar

The Knoxville radar (KMRX), 80 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, 8.0 hours before the alert went out and 224 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.

240 
WWUS84 KMRX 182002
SPSMRX

Special Weather Statement
National Weather Service Morristown TN
402 PM EDT Thu Mar 18 2021
 
TNZ013-182045-
Campbell TN-
402 PM EDT Thu Mar 18 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL CAMPBELL COUNTY
UNTIL 445 PM EDT...

At 402 PM EDT, Doppler radar was tracking a strong thunderstorm near
Red Ash, or 11 miles south of Williamsburg, moving northeast at 30
mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Jellico and Indian Mountain State Park. 

LAT...LON 3659 8398 3646 8412 3655 8425 3656 8425
      3657 8426 3659 8426
TIME...MOT...LOC 2002Z 217DEG 26KT 3658 8415 

$$

Garuckas

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, 4:03 PM EDT	Special Weather Statement	MRX	Claiborne	27 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.