Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Morristown, TN

August 9, 2021Anderson County, Tennessee

NWS Morristown, TN issued this special weather statement at Aug 9, 2021, 7:13 PM EDT for Anderson 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: Aug 9, 2021, 7:13 PM EDT (23:13 UTC)
Expired: Aug 9, 2021, 8:00 PM EDT
In force: 47 min
Issued by: NWS Morristown, TN
Hail: 0.00 in
Wind: 40

County Anderson County, TN

The radar

The Knoxville radar (KMRX), 70 km from the middle of the area, began a volume at 23:16 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, 11.2 hours before the alert went out and 217 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: 788 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 892 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

641 
WWUS84 KMRX 092313
SPSMRX

Special Weather Statement
National Weather Service Morristown TN
713 PM EDT Mon Aug 9 2021
 
TNZ013-036-037-069-100000-
Anderson TN-Union TN-Campbell TN-Knox TN-
713 PM EDT Mon Aug 9 2021

...A strong thunderstorm will impact portions of north central Knox,
northern Anderson, southern Campbell and southwestern Union Counties
through 800 PM EDT...

At 713 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles southwest of Jacksboro, or 11 miles southwest of La Follette,
moving east at 25 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Locations impacted include...
Clinton, Caryville, Rocky Top, Norris, Norris Dam State Park, Disney,
Andersonville, Big Ridge State Park and Cove Lake State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3617 8435 3631 8432 3629 8390 3605 8399
TIME...MOT...LOC 2313Z 280DEG 21KT 3624 8425 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

$$

Diegan

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 2:24 PM EDT	Special Weather Statement	MRX	Bradley	36 min
Aug 9, 3:17 PM EDT	Special Weather Statement	MRX	Scott	43 min
Aug 9, 5:29 PM EDT	Special Weather Statement	MRX	Scott	46 min
Aug 9, 5:48 PM EDT	Severe Thunderstorm Warning	MRX	Scott	42 min
Aug 9, 5:49 PM EDT	Severe Thunderstorm Warning	MRX	Morgan, Scott	41 min
Aug 9, 6:07 PM EDT	Areal Flood Advisory	MRX	Morgan	3 hr
Aug 9, 7:55 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Knox, Union	39 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.