Alert archive / Tennessee / Tornado Warnings in 2017

Tornado Warning 22, NWS Nashville, TN

April 21, 20174 counties in Tennessee

NWS Nashville, TN issued this tornado warning at Apr 21, 2017, 4:02 PM CDT for 4 counties in Tennessee. It was in force for 28 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 21, 2017, 4:02 PM CDT (21:02 UTC)
Expired: Apr 21, 2017, 4:30 PM CDT
In force: 28 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Bedford County, TN, Cannon County, TN, Coffee County, TN, Rutherford County, TN

The radar

The Northeast Alabama radar (KHTX), 73 km from the middle of the area, began a volume at 21:02 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.

What was reported inside it

Time	Report	Where	Remark
Apr 21, 4:08 PM CDT	TSTM WND DMG	1 W Bell Buckle, TN	TREES DOWN AT HIGHWAY 82 AND COOP ROAD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 9.0 hours before the alert went out and 69 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: 68 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 813 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

304 
WFUS54 KOHX 212102
TOROHX
TNC003-015-031-149-212130-
/O.NEW.KOHX.TO.W.0022.170421T2102Z-170421T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Nashville TN
402 PM CDT FRI APR 21 2017

The National Weather Service in Nashville has issued a

* Tornado Warning for...
  Southeastern Rutherford County in Middle Tennessee...
  Northwestern Coffee County in Middle Tennessee...
  Northeastern Bedford County in Middle Tennessee...
  Southwestern Cannon County in Middle Tennessee...

* Until 430 PM CDT
    
* At 402 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Shelbyville, moving northeast at 25 mph.

  HAZARD...Tornado and quarter size hail. 

  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. 

* Locations impacted include...
  Shelbyville, Wartrace, Bell Buckle, Deason, Bradyville, Beechgrove
  and Fosterville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This Tornado Warning replaces the Severe Thunderstorm Warning issued
for the same area.

&&

LAT...LON 3543 8641 3559 8651 3579 8618 3555 8602
TIME...MOT...LOC 2102Z 241DEG 20KT 3555 8639 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Rose

1 follow-up statement

594 
WWUS54 KOHX 212122
SVSOHX

Severe Weather Statement
National Weather Service Nashville TN
422 PM CDT FRI APR 21 2017

TNC149-212131-
/O.CAN.KOHX.TO.W.0022.000000T0000Z-170421T2130Z/
Rutherford TN-
422 PM CDT FRI APR 21 2017

...THE TORNADO WARNING FOR SOUTHEASTERN RUTHERFORD COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of southeastern Rutherford County. Therefore the warning has been 
cancelled.

LAT...LON 3550 8623 3566 8632 3565 8630 3565 8628
      3563 8626 3563 8625 3567 8625 3567 8624
      3569 8625 3571 8622 3570 8621 3572 8621
      3574 8616 3554 8606
TIME...MOT...LOC 2121Z 249DEG 23KT 3559 8624 

$$

TNC003-015-031-212130-
/O.CON.KOHX.TO.W.0022.000000T0000Z-170421T2130Z/
Coffee TN-Bedford TN-Cannon TN-
422 PM CDT FRI APR 21 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM CDT FOR
NORTHWESTERN COFFEE...NORTHEASTERN BEDFORD AND SOUTHWESTERN CANNON
COUNTIES...
    
At 421 PM CDT, a severe thunderstorm capable of producing a tornado
was located 12 miles northwest of Manchester, moving east at 25 mph.

HAZARD...Tornado and quarter size hail. 

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. 

Locations impacted include...
Beechgrove.

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 3550 8623 3566 8632 3565 8630 3565 8628
      3563 8626 3563 8625 3567 8625 3567 8624
      3569 8625 3571 8622 3570 8621 3572 8621
      3574 8616 3554 8606
TIME...MOT...LOC 2121Z 249DEG 23KT 3559 8624 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

13

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 1:31 PM CDT	Special Weather Statement	OHX	Rutherford	29 min
Apr 21, 1:36 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Rutherford	24 min
Apr 21, 1:59 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Rutherford, Warren	31 min
Apr 21, 2:11 PM CDT	Special Weather Statement	OHX	Perry	34 min
Apr 21, 2:25 PM CDT	Special Weather Statement	OHX	Lewis	20 min
Apr 21, 2:39 PM CDT	Areal Flood Advisory	OHX	Rutherford	3 hr
Apr 21, 2:41 PM CDT	Special Weather Statement	OHX	Maury	19 min
Apr 21, 3:00 PM CDT	Areal Flood Advisory	OHX	Perry, Wayne	3 hr
Apr 21, 3:27 PM CDT	Special Weather Statement	OHX	Marshall	18 min
Apr 21, 3:36 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Rutherford	24 min
Apr 21, 3:50 PM CDT	Areal Flood Advisory	OHX	Bedford, Marshall	3 hr
Apr 21, 3:56 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Coffee, Rutherford	34 min
Apr 21, 4:29 PM CDT	Severe Thunderstorm Warning	OHX	Cannon, Coffee, Warren	31 min
Apr 21, 5:01 PM CDT	Special Weather Statement	OHX	Warren	29 min
Apr 21, 5:12 PM CDT	Areal Flood Advisory	OHX	Rutherford, Williamson	3 hr
Apr 21, 5:33 PM CDT	Areal Flood Advisory	OHX	Bedford, Coffee	3 hr

Nearby

Tornado Warnings in Tennessee, 2017 Every tornado warning in 2017 Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.