Alert archive / North Carolina / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 21, NWS Morristown, TN

March 1, 2017Cherokee County, North Carolina; Polk County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Mar 1, 2017, 4:27 PM EST for Cherokee County, North Carolina; Polk County, Tennessee. It was in force for 18 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: Mar 1, 2017, 4:27 PM EST (21:27 UTC)
Expired: Mar 1, 2017, 4:45 PM EST
In force: 18 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cherokee County, NC, Polk County, TN

The radar

The Knoxville radar (KMRX), 123 km from the middle of the area, began a volume at 21:31 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
Mar 1, 4:40 PM EST	TSTM WND DMG	Unaka, NC	SPORADIC TREES REPORTED DOWN ACROSS CHEROKEE COUNTY.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 1, 12:48 PM EST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 9.5 hours before the alert went out and 207 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 680 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 173 m²/s²
0-3 km storm-relative helicity: 306 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

386 
WUUS54 KMRX 012127
SVRMRX
NCC039-TNC139-012230-
/O.NEW.KMRX.SV.W.0021.170301T2127Z-170301T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
427 PM EST WED MAR 1 2017

The National Weather Service in Morristown has issued a

* Severe Thunderstorm Warning for...
  Cherokee County in southwestern North Carolina...
  Southeastern Polk County in eastern Tennessee...

* Until 530 PM EST

* At 427 PM EST, a severe thunderstorm was located near Ducktown,
  moving east at 60 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Andrews, Murphy, Ducktown, William L. Davenport Refuge, Violet,
  Turtletown, Topton, Hiawasse Dam, Marble and Unaka.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

A tornado watch remains in effect until 700 PM EST for southwestern
North Carolina...and eastern Tennessee.

LAT...LON 3505 8450 3519 8451 3522 8435 3520 8435
      3521 8429 3523 8428 3525 8420 3524 8413
      3529 8402 3524 8401 3522 8397 3526 8384
      3524 8374 3526 8371 3524 8369 3520 8373
      3519 8371 3516 8374 3514 8386 3504 8396
TIME...MOT...LOC 2127Z 257DEG 58KT 3512 8442 

HAIL...1.00IN
WIND...60MPH
 
$$

05/MA

1 follow-up statement

436 
WWUS54 KMRX 012145
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
445 PM EST WED MAR 1 2017

NCC039-TNC139-012154-
/O.CAN.KMRX.SV.W.0021.000000T0000Z-170301T2230Z/
Cherokee NC-Polk TN-
445 PM EST WED MAR 1 2017

...THE SEVERE THUNDERSTORM WARNING FOR CHEROKEE AND SOUTHEASTERN POLK
COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning has been cancelled.

A tornado watch remains in effect until 700 PM EST for southwestern
North Carolina...and eastern Tennessee.

LAT...LON 3505 8450 3519 8451 3522 8435 3520 8435
      3521 8429 3523 8428 3525 8420 3524 8413
      3529 8402 3524 8401 3522 8397 3526 8384
      3524 8374 3526 8371 3524 8369 3520 8373
      3519 8371 3516 8374 3514 8386 3504 8396
TIME...MOT...LOC 2142Z 257DEG 58KT 3518 8408 

$$

05/MA

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 1, 4:14 PM EST	Special Weather Statement	MRX	Cherokee	46 min
Mar 1, 9:37 AM EST	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Morgan, Roane, Scott	53 min
Mar 1, 10:30 AM EST	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Claiborne, Grainger, Knox, Roane and 1 more	45 min
Mar 1, 11:06 AM EST	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Hancock, Hawkins	54 min
Mar 1, 11:10 AM EST	Severe Thunderstorm Warning	MRX	Hancock, Hawkins, Sullivan	65 min
Mar 1, 11:15 AM EST	Special Weather Statement	MRX	Anderson, Grainger, Jefferson, Knox	60 min
Mar 1, 11:43 AM EST	Special Weather Statement	MRX	Grainger, Union	62 min
Mar 1, 12:00 PM EST	Areal Flood Advisory	MRX	Campbell, Claiborne	3 hr
Mar 1, 12:14 PM EST	Special Weather Statement	MRX	Sullivan, Washington	46 min
Mar 1, 12:21 PM EST	Severe Thunderstorm Warning	MRX	Johnson, Sullivan	24 min
Mar 1, 12:28 PM EST	Special Weather Statement	MRX	Sullivan, Washington	62 min
Mar 1, 12:52 PM EST	Special Weather Statement	MRX	Bledsoe, Rhea	38 min
Mar 1, 12:58 PM EST	Special Weather Statement	MRX	Carter, Johnson, Sullivan, Washington	62 min
Mar 1, 1:04 PM EST	Special Weather Statement	MRX	Greene, Hamblen, Jefferson	56 min
Mar 1, 1:06 PM EST	Severe Thunderstorm Warning	MRX	Carter, Johnson, Sullivan, Washington	54 min
Mar 1, 1:11 PM EST	Severe Thunderstorm Warning	MRX	Bledsoe, Rhea	29 min
Mar 1, 1:22 PM EST	Areal Flood Advisory	MRX	Anderson, Morgan, Roane	3 hr
Mar 1, 1:23 PM EST	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox, Loudon, Roane	52 min
Mar 1, 1:35 PM EST	Flash Flood Warning	MRX	Anderson, Knox, Loudon, Roane	3 hr
Mar 1, 1:51 PM EST	Areal Flood Advisory	MRX	Bledsoe, Rhea	3 hr
Mar 1, 1:58 PM EST	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Marion, Meigs, Rhea, Sequatchie	62 min
Mar 1, 2:06 PM EST	Flash Flood Warning	MRX	Anderson, Grainger, Knox, Union	3 hr
Mar 1, 2:07 PM EST	Special Weather Statement	MRX	Cocke, Hamblen, Jefferson, Knox, Sevier	53 min
Mar 1, 2:22 PM EST	Areal Flood Advisory	MRX	Cocke, Grainger, Hamblen, Jefferson, Sevier	3 hr
Mar 1, 2:28 PM EST	Areal Flood Advisory	MRX	Greene, Hawkins	3 hr
Mar 1, 2:29 PM EST	Special Weather Statement	MRX	Carter, Greene, Unicoi, Washington	46 min
Mar 1, 2:30 PM EST	Severe Thunderstorm Warning	MRX	Marion	45 min
Mar 1, 2:59 PM EST	Special Weather Statement	MRX	Hamilton, McMinn, Meigs, Rhea	61 min
Mar 1, 3:00 PM EST	Flash Flood Warning	MRX	Grainger, Hamblen, Jefferson	3 hr
Mar 1, 3:02 PM EST	Severe Thunderstorm Warning	MRX	Hamilton, Marion	58 min
Mar 1, 3:03 PM EST	Special Weather Statement	MRX	Blount, Cocke, Jefferson, Loudon, Sevier	57 min
Mar 1, 3:20 PM EST	Severe Thunderstorm Warning	MRX	Blount, Knox, Sevier	30 min
Mar 1, 3:30 PM EST	Areal Flood Advisory	MRX	Blount, Knox	3 hr
Mar 1, 3:30 PM EST	Special Weather Statement	MRX	McMinn, Monroe	60 min
Mar 1, 3:35 PM EST	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, McMinn, Meigs, Monroe, Polk	55 min
Mar 1, 3:59 PM EST	Special Weather Statement	MRX	Carter, Cocke, Greene, Monroe, Sevier, Unicoi	46 min
Mar 1, 4:03 PM EST	Areal Flood Advisory	MRX	Hawkins, Sullivan, Washington	117 min
Mar 1, 4:10 PM EST	Severe Thunderstorm Warning	MRX	Blount, Monroe	18 min
Mar 1, 4:31 PM EST	Areal Flood Advisory	MRX	Cocke, Greene, Jefferson	3 hr
Mar 1, 4:46 PM EST	Flash Flood Warning	MRX	Blount, Jefferson, Knox, Loudon, Sevier	3 hr

Nearby

Severe Thunderstorm Warnings in North Carolina, 2017 Severe Thunderstorm Warnings in Tennessee, 2017 Every severe thunderstorm warning 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.