Alert archive / Tennessee / Tornado Warnings in 2021

Tornado Warning 13, NWS Nashville, TN

April 8, 2021Cumberland County, Fentress County, Tennessee

NWS Nashville, TN issued this tornado warning at Apr 8, 2021, 3:39 PM CDT for Cumberland County, Fentress County, Tennessee. It was in force for 21 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: Apr 8, 2021, 3:39 PM CDT (20:39 UTC)
Expired: Apr 8, 2021, 4:00 PM CDT
In force: 21 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Cumberland County, TN, Fentress County, TN

The radar

The Knoxville radar (KMRX), 137 km from the middle of the area, began a volume at 20:43 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, 8.7 hours before the alert went out and 150 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: 55 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 626 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 354 m²/s²
0-3 km storm-relative helicity: 375 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

246 
WFUS54 KOHX 082039
TOROHX
TNC035-049-082100-
/O.NEW.KOHX.TO.W.0013.210408T2039Z-210408T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Nashville TN
339 PM CDT Thu Apr 8 2021

The National Weather Service in Nashville has issued a

* Tornado Warning for...
  North central Cumberland County in Middle Tennessee...
  South central Fentress County in Middle Tennessee...

* Until 400 PM CDT.
    
* At 338 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 10 miles northwest of Fairfield Glade, or 11 miles
  north of Crossville, moving northeast at 40 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This tornadic thunderstorm will remain over mainly rural areas of
  north central Cumberland and south central Fentress Counties,
  including the following locations... Clarkrange.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3604 8499 3610 8515 3627 8488 3624 8488
      3624 8489 3623 8489 3621 8491 3619 8491
      3618 8490 3615 8491 3613 8487 3610 8485
TIME...MOT...LOC 2038Z 231DEG 35KT 3612 8499 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

10

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 8, 1:01 AM CDT	Special Weather Statement	OHX	Bedford, Cannon, Coffee, Macon, Rutherford, Trousdale and 1 more	44 min
Apr 8, 9:29 AM CDT	Special Weather Statement	OHX	Coffee	46 min
Apr 8, 1:32 PM CDT	Special Weather Statement	OHX	Van Buren	28 min
Apr 8, 2:07 PM CDT	Special Weather Statement	OHX	Cumberland	38 min
Apr 8, 2:11 PM CDT	Special Weather Statement	OHX	Overton	34 min
Apr 8, 4:57 PM CDT	Special Weather Statement	OHX	Fentress	33 min
Apr 8, 5:15 PM CDT	Tornado Warning	OHX	Fentress	16 min

Nearby

Tornado Warnings in Tennessee, 2021 Every tornado warning in 2021 Tornadoes 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.