Alert archive / North Carolina / Special Weather Statements in 2017

Special Weather Statement, NWS Morristown, TN

March 28, 2017Polk County, Tennessee; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this special weather statement at Mar 28, 2017, 12:29 AM EDT for Polk County, Tennessee; Cherokee County, Clay County, North Carolina. It was in force for 61 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
Mar 28, 2017, 12:29 AM EDT (04:29 UTC)
Expired
Mar 28, 2017, 1:30 AM EDT
In force
61 min
Issued by
NWS Morristown, TN

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

The radar

The Knoxville radar (KMRX), 123 km from the middle of the area, began a volume at 04:30 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 4.5 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-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 00:00Z on 2017-03-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 115 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 00:00Z on 2017-03-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
115 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
1908 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
110 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Mar 27, 10:24 PM EDT, 2 hours 5 minutes earlier.

Area forecast discussion, Mar 27, 10:24 PM EDT, 2 hours 5 minutes before
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Hazardous weather outlook, Mar 27, 2:59 PM EDT, 9 hours 30 minutes before
Hazardous Weather Outlook
National Weather Service Morristown TN
259 PM EDT Mon Mar 27 2017

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-281900-
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-
259 PM EDT Mon Mar 27 2017 /159 PM CDT Mon Mar 27 2017/

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

.DAY ONE...This Afternoon and Tonight

Strong to potentially severe thunderstorms are expected this
afternoon and evening for the Cumberland Plateau and the Tennessee
Valley. Some of these storms will be capable of producing damaging
wind gusts and hail up to quarter size.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Another storm system will move across the Tennessee Valley
Thursday producing showers and thunderstorms. Some of these storms
may become severe across the Plateau and southeast Tennessee by
late afternoon and evening.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed late this afternoon and evening,
and again Thursday.

In the hours before

Special weather statement, Mar 27, 9:19 PM EDT, 3 hours 10 minutes before
Special Weather Statement
National Weather Service Morristown TN
919 PM EDT MON MAR 27 2017

TNZ037>039-069-070-280200-
Jefferson TN-Hamblen TN-Union TN-Knox TN-Grainger TN-
919 PM EDT MON MAR 27 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN KNOX...NORTHERN
JEFFERSON...GRAINGER...SOUTHEASTERN UNION AND SOUTHWESTERN HAMBLEN
COUNTIES UNTIL 1000 PM EDT...

At 919 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles south of Plainview, or 9 miles northeast of Knoxville, moving
northeast at 40 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
Knoxville, Morristown, Jefferson City, Rutledge, White Pine,
Plainview, New Market, Strawberry Plains, Halls, Blaine, Luttrell,
Thorn Hill, House Mountain S.p., Buffalo Springs, Panther Creek S.p.,
Alpha, Maloneyville, Mascot and Joppa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

A severe thunderstorm watch remains in effect until 1100 PM EDT for
eastern Tennessee.

LAT...LON 3640 8344 3612 8326 3602 8362 3604 8365
      3604 8367 3601 8367 3594 8390 3609 8400
      3637 8358 3637 8356 3635 8354 3636 8353
      3636 8352 3637 8351 3637 8349 3638 8350
      3637 8345 3640 8346
TIME...MOT...LOC 0119Z 242DEG 35KT 3607 8382

AMP.23
Special weather statement, Mar 27, 10:24 PM EDT, 2 hours 5 minutes before
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Special weather statement, Mar 27, 11:13 PM EDT, 1 hour 16 minutes before
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Local storm report, Mar 27, 11:36 PM EDT, 53 minutes before
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Special weather statement, Mar 27, 11:56 PM EDT, 33 minutes before
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Special weather statement, Mar 28, 12:29 AM EDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Mar 27, 8:06 PM EDTSpecial Weather StatementMRXCampbell, Claiborne39 min
Mar 27, 8:34 PM EDTSpecial Weather StatementMRXHancock41 min
Mar 27, 8:58 PM EDTSevere Thunderstorm WarningMRXBlount, Knox, Sevier32 min
Mar 27, 9:15 PM EDTSpecial Weather StatementMRXMonroe45 min
Mar 27, 9:19 PM EDTSpecial Weather StatementMRXGrainger41 min
Mar 27, 9:28 PM EDTSevere Thunderstorm WarningMRXCocke, Greene, Hamblen, Jefferson, Knox, Sevier23 min
Mar 27, 10:24 PM EDTSpecial Weather StatementMRXBledsoe, Marion, Sequatchie51 min
Mar 27, 11:13 PM EDTSpecial Weather StatementMRXBradley, Hamilton, McMinn, Marion47 min
Mar 27, 11:56 PM EDTSpecial Weather StatementMRXBradley, Polk49 min
Mar 27, 8:18 PM EDTSpecial Weather StatementMRXCherokee42 min
Mar 27, 8:52 PM EDTSpecial Weather StatementMRXCherokee38 min
Mar 27, 9:23 PM EDTSevere Thunderstorm WarningMRXClay37 min

Nearby

Special Weather Statements in North Carolina, 2017Special Weather Statements in Tennessee, 2017Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.