Alert archive / Tennessee / Tornado Warnings in 2017

Tornado Warning 3, NWS Morristown, TN

May 12, 2017Carter County, Johnson County, Sullivan County, Tennessee

NWS Morristown, TN issued this tornado warning at May 12, 2017, 2:20 PM EDT for Carter County, Johnson County, Sullivan County, Tennessee. It was in force for 25 min. 2 reports 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: May 12, 2017, 2:20 PM EDT (18:20 UTC)
Expired: May 12, 2017, 2:45 PM EDT
In force: 25 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Carter County, TN, Johnson County, TN, Sullivan County, TN

The radar

The Roanoke radar (KFCX), 145 km from the middle of the area, began a volume at 18:22 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
May 12, 2:30 PM EDT	HAIL 1	14 E Bristol Tn, TN
May 12, 2:31 PM EDT	TSTM WND DMG	Shady Valley, TN	REPORTS OF TREES DOWN...A STORAGE SHED BLOWN FROM ITS FOUNDATION...AND METAL ROOF PEELED OFF OF A DOUBLEWIDE STRUCTURE. TIME ESTIMATED BY RADAR.

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

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 6.3 hours before the alert went out and 175 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 534 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

044 
WFUS54 KMRX 121820
TORMRX
TNC019-091-163-121845-
/O.NEW.KMRX.TO.W.0003.170512T1820Z-170512T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Morristown TN
220 PM EDT FRI MAY 12 2017

The National Weather Service in Morristown has issued a

* Tornado Warning for...
  Northeastern Sullivan County in eastern Tennessee...
  Northeastern Carter County in eastern Tennessee...
  Johnson County in eastern Tennessee...

* Until 245 PM EDT
    
* At 220 PM EDT, a severe thunderstorm capable of producing a tornado
  was located 9 miles southeast of Bristol Tn, 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. 

* This dangerous storm will be near...
  Mountain City around 245 PM EDT. 

Other locations impacted by this tornadic thunderstorm include South
Holston Dam, Harr, Sadie, Shady Valley and Laurel Bloomery.

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 3659 8168 3657 8168 3657 8169 3655 8169
      3653 8171 3647 8170 3646 8171 3642 8172
      3641 8174 3638 8173 3643 8211 3659 8210
      3659 8194 3662 8192 3661 8165
TIME...MOT...LOC 1820Z 269DEG 20KT 3651 8204 

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

$$

EJH

1 follow-up statement

484 
WWUS54 KMRX 121835
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
235 PM EDT FRI MAY 12 2017

TNC019-121844-
/O.CAN.KMRX.TO.W.0003.000000T0000Z-170512T1845Z/
Carter TN-
235 PM EDT FRI MAY 12 2017

...THE TORNADO WARNING FOR NORTHEASTERN CARTER COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

LAT...LON 3659 8168 3655 8169 3653 8171 3647 8170
      3646 8171 3642 8172 3641 8174 3638 8173
      3650 8198 3651 8199 3659 8199 3659 8194
      3662 8192 3661 8165
TIME...MOT...LOC 1834Z 269DEG 20KT 3651 8194 

$$

TNC091-163-121845-
/O.CON.KMRX.TO.W.0003.000000T0000Z-170512T1845Z/
Sullivan TN-Johnson TN-
235 PM EDT FRI MAY 12 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 245 PM EDT FOR
NORTHEASTERN SULLIVAN AND NORTHERN JOHNSON COUNTIES...
    
At 234 PM EDT, a severe thunderstorm capable of producing a tornado 
was located 8 miles west of Mountain City, moving east at 25 mph. 
Spotter report of 1 inch hail has already been reported with this 
storm.

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. 

This dangerous storm will be near...
  Mountain City around 245 PM EDT. 

Other locations impacted by this tornadic thunderstorm include Shady
Valley and Laurel Bloomery.

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 3659 8168 3655 8169 3653 8171 3647 8170
      3646 8171 3642 8172 3641 8174 3638 8173
      3650 8198 3651 8199 3659 8199 3659 8194
      3662 8192 3661 8165
TIME...MOT...LOC 1834Z 269DEG 20KT 3651 8194 

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

$$

EJH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 8:06 PM EDT	Special Weather Statement	MRX	Hancock	39 min
May 11, 8:18 PM EDT	Severe Thunderstorm Warning	MRX	Hancock	27 min
May 11, 8:29 PM EDT	Special Weather Statement	MRX	Claiborne	46 min
May 11, 8:31 PM EDT	Special Weather Statement	MRX	Campbell, Scott	44 min
May 11, 8:37 PM EDT	Special Weather Statement	MRX	Hawkins	38 min
May 11, 8:57 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Union	22 min
May 11, 9:15 PM EDT	Special Weather Statement	MRX	Sullivan	45 min
May 11, 11:39 PM EDT	Special Weather Statement	MRX	Morgan	51 min
May 12, 3:26 PM EDT	Areal Flood Advisory	MRX	Monroe	2 hr
May 12, 3:54 PM EDT	Special Weather Statement	MRX	Meigs	51 min
May 12, 4:06 PM EDT	Areal Flood Advisory	MRX	McMinn, Meigs	3 hr
May 12, 4:12 PM EDT	Special Weather Statement	MRX	Cocke, Greene	48 min
May 12, 4:17 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene	21 min
May 12, 4:29 PM EDT	Special Weather Statement	MRX	Unicoi	46 min
May 12, 4:36 PM EDT	Areal Flood Advisory	MRX	Blount, Sevier	3 hr
May 12, 4:52 PM EDT	Areal Flood Advisory	MRX	Greene, Unicoi, Washington	3 hr
May 12, 5:01 PM EDT	Special Weather Statement	MRX	Loudon	44 min
May 12, 5:05 PM EDT	Special Weather Statement	MRX	Washington	40 min
May 12, 5:20 PM EDT	Areal Flood Advisory	MRX	Greene, Washington	3 hr
May 12, 5:57 PM EDT	Areal Flood Advisory	MRX	Carter, Sullivan	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.