Alert archive / North Carolina / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 90, NWS Morristown, TN

May 27, 2017Cherokee County, Clay County, North Carolina; Polk County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at May 27, 2017, 10:50 PM EDT for Cherokee County, Clay County, North Carolina; Polk County, Tennessee. It was in force for 55 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: May 27, 2017, 10:50 PM EDT (02:50 UTC)
Expired: May 27, 2017, 11:45 PM EDT
In force: 55 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Cherokee County, NC, Clay County, NC, Polk County, TN

The radar

The Knoxville radar (KMRX), 127 km from the middle of the area, began a volume at 02:51 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 27, 11:44 PM EDT	TSTM WND DMG	Murphy, NC	SEVERAL TREES DOWN ACROSS THE COUNTY.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 54 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
May 27, 6:55 PM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 2.8 hours before the alert went out and 206 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: 930 J/kg
Mixed-layer CIN: -238 J/kg
Mixed-layer LCL: 1118 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

957 
WUUS54 KMRX 280250
SVRMRX
NCC039-043-TNC139-280345-
/O.NEW.KMRX.SV.W.0090.170528T0250Z-170528T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
1050 PM EDT SAT MAY 27 2017

The National Weather Service in Morristown has issued a

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

* Until 1145 PM EDT

* At 1050 PM EDT, severe thunderstorms were located along a line
  extending from 12 miles southwest of Pigeon Forge to 10 miles
  southeast of Madisonville to near Etowah to 6 miles northwest of
  Cleveland, moving southeast at 60 mph.

  HAZARD...70 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings. 

* Locations impacted include...
  Andrews, Murphy, Benton, Ducktown, Hayesville, Nantahala Lake,
  William L. Davenport Refuge, Tusquitee, Conasauga, Violet,
  Parksville, Turtletown, Reliance, Hiawasse Dam, Archville, Marble,
  Brasstown, Shooting Creek, Hot House and Topton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3500 8477 3518 8469 3525 8469 3528 8449
      3520 8435 3522 8433 3521 8429 3527 8423
      3524 8419 3524 8413 3529 8403 3524 8401
      3522 8397 3526 8384 3525 8370 3523 8369
      3520 8373 3515 8373 3516 8365 3500 8351
TIME...MOT...LOC 0250Z 292DEG 50KT 3568 8374 3545 8419 3531 8448 3523
8496

HAIL...<.75IN
WIND...70MPH
 
$$

05/MA

1 follow-up statement

635 
WWUS54 KMRX 280333
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
1133 PM EDT SAT MAY 27 2017

NCC039-043-TNC139-280345-
/O.CON.KMRX.SV.W.0090.000000T0000Z-170528T0345Z/
Cherokee NC-Clay NC-Polk TN-
1133 PM EDT SAT MAY 27 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT
FOR SOUTHERN CHEROKEE...CLAY AND SOUTHERN POLK COUNTIES...

At 1133 PM EDT, severe thunderstorms were located along a line
extending from 6 miles north of Franklin to near Hayesville to 8
miles west of Murphy to 10 miles south of Benton, moving southeast at
35 mph.

HAZARD...70 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings. 

Locations impacted include...
Murphy, Ducktown, Hayesville, Nantahala Lake, William L. Davenport
Refuge, Shooting Creek, Tusquitee, Conasauga, Hot House, Brasstown,
Big Frog Mountain and Copperhill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3508 8473 3512 8430 3520 8373 3515 8373
      3516 8365 3500 8351 3500 8477
TIME...MOT...LOC 0333Z 307DEG 31KT 3526 8335 3511 8386 3507 8417 3502
8468

HAIL...<.75IN
WIND...70MPH
 
$$

05/MA

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Morristown, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at May 27, 9:04 PM EDT, 1 hour 46 minutes earlier.

Area forecast discussion, May 27, 9:04 PM EDT, 1 hour 46 minutes before

Area Forecast Discussion...UPDATED
National Weather Service Morristown TN
904 PM EDT Sat May 27 2017

.DISCUSSION...Will be making some significant changes to going
forecast. Convective complex across middle Tennessee will move
east southeast across Tennessee the rest of this evening through
early Sunday morning. Airmass ahead of this system remain quite
unstable with MLCAPE of 1700-2500 J/kg. High DCAPE near 1000 J/kg
and Hail CAPES of 500-700 J/kg will keep the threat of damaging
winds and large hail up to Golfball size with the stronger storms.

Good TEI values across middle Tennessee will also aid producing
relative cool/meso-high over this area. This meso-high will
enhance the forming squall-line. This squall-line will moving
across east Tennessee, generally along and south of TRI,
eventually across southwest Virginia.

These storms will move south/southeast of the area by early Sunday
morning with light/moderate rain showers continuing.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             68  85  69  82 /  90  60  60  40
Knoxville McGhee Tyson Airport, TN  66  82  66  79 /  80  60  60  40
Oak Ridge, TN                       66  82  66  79 /  80  60  60  40
Tri Cities Airport, TN              61  79  63  78 /  60  60  60  50

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...None.
TN...None.
VA...None.
&&

Hazardous weather outlook, May 27, 3:16 PM EDT, 7 hours 34 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Morristown TN
316 PM EDT Sat May 27 2017

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-281930-
Cherokee-Clay-Scott TN-Campbell-Claiborne-Hancock-Hawkins-
Sullivan-Johnson-Morgan-Anderson-Union-Grainger-Hamblen-
Northwest Cocke-Cocke Smoky Mountains-Northwest Greene-
Southeast Greene-Washington TN-Unicoi-Northwest Carter-
Southeast Carter-Roane-Loudon-Knox-Jefferson-NW Blount-
Blount Smoky Mountains-North Sevier-Sevier Smoky Mountains-
Sequatchie-Bledsoe-Rhea-Meigs-McMinn-Northwest Monroe-
Southeast Monroe-Marion-Hamilton-Bradley-West Polk-East Polk-Lee-
Wise-Scott-Russell-Washington-
316 PM EDT Sat May 27 2017 /216 PM CDT Sat May 27 2017/

This Hazardous Weather Outlook is for portions of Southwest North
Carolina...East Tennessee and Southwest Virginia.

.DAY ONE...This Afternoon and Tonight

Numerous strong to severe thunderstorms are expected across the
ares during the late afternoon and evening hours, with damaging
winds and large hail up to golfball size being the main threat.
The most likely timing for severe storms is between 5 pm and 11 pm
EDT.

Another round of severe weather is possible late tonight into
Sunday morning as a strong line of storms drops into the region
from the northwest. The potential for damaging winds will exist
with this system.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

On Sunday evening and night another round of showers and
thunderstorms is possible, with some of the storms potentially
becoming strong to severe.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this weekend.

In the hours before

Local storm report, May 27, 10:26 PM EDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1026 PM EDT SAT MAY 27 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1020 PM     TSTM WND DMG     KINGSTON                35.87N 84.51W
05/27/2017                   ROANE              TN   911 CALL CENTER

            TREES DOWN ACROSS THE COUNTY.

&&

DH

Local storm report, May 27, 10:30 PM EDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1030 PM EDT SAT MAY 27 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1025 PM     TSTM WND DMG     CLINTON                 36.09N 84.13W
05/27/2017                   ANDERSON           TN   911 CALL CENTER

            SEVERAL TREES DOWN ACROSS THE COUNTY.

&&

DH

Local storm report, May 27, 10:31 PM EDT, 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1031 PM EDT SAT MAY 27 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1025 PM     TSTM WND DMG     LA FOLLETTE             36.37N 84.13W
05/27/2017                   CAMPBELL           TN   911 CALL CENTER

            A FEW TREES DOWN ACROSS THE COUNTY.

&&

DH

Local storm report, May 27, 10:40 PM EDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1040 PM EDT SAT MAY 27 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1040 PM     TSTM WND DMG     KNOXVILLE               35.97N 83.95W
05/27/2017                   KNOX               TN   911 CALL CENTER

            NUMEROUS TREES AND POWER LINES DOWN ACROSS THE COUNTY.

&&

DH

Local storm report, May 27, 10:43 PM EDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1043 PM EDT SAT MAY 27 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1043 PM     TSTM WND DMG     LOUDON                  35.74N 84.36W
05/27/2017                   LOUDON             TN   911 CALL CENTER

            WIDESPREAD TREES AND POWER LINES DOWN ACROSS THE COUNTY.

&&

DH

Local storm report, May 27, 10:49 PM EDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1049 PM EDT SAT MAY 27 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1043 PM     TSTM WND GST     ALCOA                   35.79N 83.98W
05/27/2017  M49 MPH          BLOUNT             TN   ASOS

            THE KNOXVILLE MCGHEE TYSON AIRPORT REPORTED A WIND GUSTS
            OF 49KTS.

&&

DH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 8:07 PM EDT	Special Weather Statement	MRX	Johnson, Sullivan	53 min
May 27, 8:21 PM EDT	Special Weather Statement	MRX	Campbell, Scott	39 min
May 27, 8:26 PM EDT	Special Weather Statement	MRX	Hancock, Hawkins	49 min
May 27, 8:50 PM EDT	Special Weather Statement	MRX	Scott	55 min
May 27, 8:53 PM EDT	Special Weather Statement	MRX	Carter, Johnson, Sullivan	67 min
May 27, 9:25 PM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Morgan, Rhea, Roane, Scott, Sequatchie	65 min
May 27, 10:00 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Claiborne, Knox, Union	60 min
May 27, 10:01 PM EDT	Areal Flood Advisory	MRX	Carter, Johnson, Sullivan	3 hr
May 27, 10:08 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Bradley, Hamilton, Loudon, McMinn, Marion and 2 more	67 min
May 27, 10:31 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Grainger, Hamblen, Jefferson, Sevier	59 min
May 27, 11:09 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hawkins	66 min
May 27, 11:29 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Hamblen	31 min
May 27, 11:54 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Unicoi, Washington	31 min

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.