Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Morristown, TN

May 28, 20215 counties in Tennessee

NWS Morristown, TN issued this special weather statement at May 28, 2021, 4:13 PM EDT for 5 counties in Tennessee. It was in force for 47 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: May 28, 2021, 4:13 PM EDT (20:13 UTC)
Expired: May 28, 2021, 5:00 PM EDT
In force: 47 min
Issued by: NWS Morristown, TN

Counties Anderson County, TN, Claiborne County, TN, Grainger County, TN, Knox County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 34 km from the middle of the area, began a volume at 20:14 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

Nashville Metro, TN (KBNA), launched 12:00Z, 8.2 hours before the alert went out and 254 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: 204 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 749 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 182 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 May 28, 3:49 PM EDT, 24 minutes earlier.

Area forecast discussion, May 28, 3:49 PM EDT, 24 minutes before

AREA FORECAST DISCUSSION
National Weather Service Morristown TN
349 PM EDT Fri May 28 2021

.SHORT TERM...(Tonight and Saturday)...

A pre-frontal line of showers and thunderstorms is moving across
northern and western sections of the forecast area at mid
afternoon. Gusty winds to 40 mph and locally heavy rain is falling
in the line with heaviest rainfall over the northern plateau.
Small hail is possible in the storms too. Temperatures are in the
80s out ahead of the line with 85 at Chattanooga to mid 60s to
around 70 in rain cooled areas. Eastern sections of the forecast
area will see the showers and storms in the next few hours. Still
possible that a few storms could produce higher wind gusts and
knock some trees down. Later this evening more showers are
possible ahead of cold front now moving across western Tennessee.
This activity should be lighter than the current activity.
Adjusted forecast to lower rain chances after 06Z Saturday. Lows
tonight will be much colder than the last several days mostly 50s.
Saturday behind cold front deep upper trough settles over the
eastern states with shortwave energy rotating across the region.
Clouds will be slow to clear with a chance of showers. Highest
chances across the northeast part of the region. Temperatures will
be about 15 degrees cooler...in the mid 60s to near 70.

TD

.LONG TERM...(Saturday night through Friday)...

Key Messages:

1. Light and lingering rain showers Saturday night into Sunday
morning across northeast TN and southwest VA, drier Sunday through
Tuesday.

2. Moisture and temperatures will gradually rebound mid-week through
the end of the week along with increasing chances of precipitation.

Upper trough will be pulling out of the area Saturday night.
There may be a few light, lingering, showers early Saturday
evening into Sunday morning across northeast TN and SWVA.
Overnight lows will range from the upper 40s to near 50. On
Sunday, clouds may linger across northeast TN and SWVA in the
morning before clearing out late afternoon as northwest flow helps
to bring drier air into the region. Most other areas should see
plenty of sun. Highs will top out in the upper 60s to mid 70s.
Northwest flow transitions to zonal flow on Monday but with dry
air remaining. The rising heights will allow temperatures to be
warmer with highs in the upper 70s to low 80s.

Both temperatures and moisture climb on Tuesday as a high pressure
to our east provides southwesterly flow across our area. Most areas
will stay dry but will have a slight chance POP in for the eastern
mountains.

Our best chances for precip look to occur on Wednesday and Thursday
though there are model differences. On Wednesday, a shortwave will
move out of the Great Plains and toward our area. On Thursday, the
GFS shows this shortwave moving up through the Ohio River Valley and
getting absorbed into a long wave trough as it's swinging through
the Great Lakes Region. However, the ECMWF shows the shortwave
becoming cutoff and forming a closed low. We should get rain/storms
regardless of how this plays out. The main difference will be
timing. With the GFS, precip chances would linger through Friday as
the trough will be a slow mover due to a Bermuda high in place to
the east. The ECMWF would keep precip going [past the extended
forecast due to the cutoff low. Temps Wednesday through Friday will
be in the low 80s for highs and 60s for lows.

SR

&&

.AVIATION...
18Z TAF DISCUSSION.

Ceilings will drop to MVFR because of thunderstorms this
afternoon temporarily and gusty winds from the southwest will
continue through early evening with gusts up to around 25 knots.
Lower clouds and showers may reform ahead of the cold front by
late evening. MVFR ceilings to linger late tonight and slowly
improve by late morning.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             57  70  51  76  53 /  40  10   0   0   0
Knoxville McGhee Tyson Airport, TN  57  66  51  70  50 /  70  20  10  10   0
Oak Ridge, TN                       56  66  48  71  49 /  70  10  10  10   0
Tri Cities Airport, TN              58  67  50  66  47 /  90  20  20  10   0

&&

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

Hazardous weather outlook, May 28, 3:23 PM EDT, 50 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
323 PM EDT Fri May 28 2021

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-291930-
Cherokee-Clay-Scott-Campbell-Claiborne-Hancock-Hawkins-Sullivan-
Johnson-Morgan-Anderson-Union-Grainger-Hamblen-Northwest Cocke-
Cocke Smoky Mountains-Northwest Greene-Southeast Greene-
Washington-Unicoi-Northwest Carter-Southeast Carter-Roane-Loudon-
Knox-Jefferson-Northwest 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-Russell-
323 PM EDT Fri May 28 2021 /223 PM CDT Fri May 28 2021/

This Hazardous Weather Outlook is for portions of southwest North
Carolina...east Tennessee and southwest Virginia.

.DAY ONE...This Afternoon and Tonight

Showers and thunderstorms will move across the region through
early this evening. An isolated storm could be severe late this
afternoon into the evening producing localized damaging winds up
to 60 mph and hail up to quarter size. The thunderstorms will
also produce locally heavy rainfall that could cause ponding in
low-lying or poor drainage areas.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not needed at this time.

TD/SR

In the hours before

Special weather statement, May 28, 3:00 PM EDT, 1 hour 13 minutes before

Special Weather Statement
National Weather Service Morristown TN
300 PM EDT Fri May 28 2021

TNZ014>016-038-281945-
Claiborne TN-Hancock TN-Grainger TN-Hawkins TN-
300 PM EDT Fri May 28 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN CLAIBORNE...WEST
CENTRAL HAWKINS...WESTERN HANCOCK AND GRAINGER COUNTIES UNTIL 345 PM
EDT...

At 300 PM EDT, Doppler radar was tracking a strong thunderstorm near
Rutledge, moving northeast at 25 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Rutledge, Bean Station, Lone Mountain, Howard Quarter, Thorn Hill,
Mooresburg, Evanston, Joppa and Treadway.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 3659 8334 3634 8317 3633 8318 3632 8317
      3632 8320 3631 8320 3628 8332 3630 8333
      3628 8334 3627 8336 3620 8369 3626 8370
      3629 8368 3630 8369 3634 8367 3635 8367
TIME...MOT...LOC 1900Z 239DEG 23KT 3632 8358

Moulton

Special weather statement, May 28, 3:08 PM EDT, 1 hour 5 minutes before

Special Weather Statement
National Weather Service Morristown TN
308 PM EDT Fri May 28 2021

TNZ016-017-VAZ005-008-281945-
Sullivan TN-Hawkins TN-Washington VA-Scott VA-
308 PM EDT Fri May 28 2021

...SIGNIFICANT WEATHER ADVISORY FOR SULLIVAN...NORTHEASTERN
HAWKINS...SOUTHEASTERN SCOTT AND SOUTHWESTERN WASHINGTON COUNTIES AND
THE CITY OF BRISTOL UNTIL 345 PM EDT...

At 308 PM EDT, Doppler radar was tracking a strong thunderstorm near
Kingsport, moving east at 20 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Kingsport, Bristol Tn, Bristol Va, Gate City, Weber City, Walnut
Hill, Spurgeon, Colonial Heights, Gray and Oak Grove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 3648 8209 3642 8260 3644 8267 3642 8268
      3641 8271 3662 8278 3676 8235 3671 8233
      3675 8226 3679 8214
TIME...MOT...LOC 1908Z 250DEG 20KT 3655 8261

Moulton

Special weather statement, May 28, 3:33 PM EDT, 40 minutes before

Special Weather Statement
National Weather Service Morristown TN
333 PM EDT Fri May 28 2021

TNZ012-013-035-036-067-083-282015-
Rhea TN-Anderson TN-Scott TN-Roane TN-Campbell TN-Morgan TN-
333 PM EDT Fri May 28 2021

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN MORGAN...NORTHEASTERN
RHEA...WESTERN ANDERSON...CAMPBELL...ROANE AND EASTERN SCOTT COUNTIES
UNTIL 415 PM EDT...

At 332 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Strunk to 8 miles west of Rockwood.
Movement was east at 35 mph.

Pea size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Oak Ridge, Lenoir City, La Follette, Kingston, Rockwood, Oneida,
Wartburg, Oliver Springs, Jacksboro and Huntsville.

LAT...LON 3659 8399 3584 8434 3575 8485 3581 8482
      3583 8477 3591 8468 3600 8473 3660 8444
TIME...MOT...LOC 1932Z 259DEG 31KT 3657 8445 3583 8481

SR

Special weather statement, May 28, 3:38 PM EDT, 35 minutes before

Special Weather Statement
National Weather Service Morristown TN
338 PM EDT Fri May 28 2021

VAZ008-282015-
Washington VA-
338 PM EDT Fri May 28 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL WASHINGTON COUNTY AND THE
NORTHEASTERN CITY OF BRISTOL UNTIL 415 PM EDT...

At 338 PM EDT, Doppler radar was tracking a strong thunderstorm near
Abingdon, moving east at 30 mph.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Bristol Va, Abingdon, Glade Spring, Lindell, Holston, Hilander Park
and Emory-Meadow View.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3661 8213 3678 8216 3680 8211 3682 8212
      3683 8211 3688 8200 3687 8194 3689 8189
      3693 8184 3693 8183 3679 8170 3675 8168
TIME...MOT...LOC 1938Z 249DEG 28KT 3679 8199

SR

Special weather statement, May 28, 3:54 PM EDT, 19 minutes before

Special Weather Statement
National Weather Service Morristown TN
354 PM EDT Fri May 28 2021

TNZ068-071-086-282030-
Northwest Monroe TN-Loudon TN-NW Blount TN-
354 PM EDT Fri May 28 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN LOUDON...
NORTHWESTERN BLOUNT AND NORTHWESTERN MONROE COUNTIES UNTIL 430 PM
EDT...

At 354 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles north of Madisonville, moving northeast at 35 mph.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Maryville, Lenoir City, Loudon, Madisonville, Louisville, Vonore,
Greenback, Friendsville, Philadelphia and Fort Loudon State Park.

LAT...LON 3566 8447 3583 8419 3579 8416 3579 8414
      3584 8414 3585 8415 3585 8413 3584 8412
      3583 8412 3584 8411 3567 8398 3553 8437
TIME...MOT...LOC 1954Z 237DEG 30KT 3563 8433

SR

Special weather statement, May 28, 4:13 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Morristown TN
413 PM EDT Fri May 28 2021

TNZ013-014-036>038-069-282100-
Anderson TN-Claiborne TN-Union TN-Campbell TN-Grainger TN-Knox TN-
413 PM EDT Fri May 28 2021

...SIGNIFICANT WEATHER ADVISORY FOR CLAIBORNE...KNOX...ANDERSON...
EASTERN CAMPBELL...UNION AND WESTERN GRAINGER COUNTIES UNTIL 500 PM
EDT...

At 412 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near La Follette to near Oak Ridge. Movement
was east at 40 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations impacted include...
Knoxville, Oak Ridge, Clinton, Alcoa, La Follette, Maynardville,
Rutledge, Farragut, New Tazewell and Tazewell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

These storms 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.

&&

LAT...LON 3650 8339 3616 8353 3618 8354 3619 8356
      3613 8361 3614 8364 3610 8363 3612 8367
      3608 8366 3609 8371 3597 8365 3585 8385
      3586 8398 3588 8400 3587 8403 3586 8401
      3588 8425 3597 8431 3655 8408
TIME...MOT...LOC 2012Z 274DEG 47KT 3641 8418 3597 8436

Moulton

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 2:44 PM EDT	Special Weather Statement	MRX	Hancock, Hawkins	46 min
May 28, 2:58 PM EDT	Areal Flood Advisory	MRX	Campbell, Morgan, Scott	3 hr
May 28, 3:00 PM EDT	Special Weather Statement	MRX	Grainger	45 min
May 28, 3:08 PM EDT	Special Weather Statement	MRX	Sullivan	37 min
May 28, 3:33 PM EDT	Special Weather Statement	MRX	Campbell, Morgan, Roane, Scott	42 min
May 28, 3:54 PM EDT	Special Weather Statement	MRX	Loudon	36 min
May 28, 3:58 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox, Morgan, Roane	47 min
May 28, 4:18 PM EDT	Special Weather Statement	MRX	Monroe	42 min
May 28, 4:32 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Jefferson, Knox, Union	43 min
May 28, 4:56 PM EDT	Special Weather Statement	MRX	Grainger, Hamblen, Jefferson	49 min
May 28, 5:02 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Grainger, Greene, Hamblen, Hawkins, Jefferson	43 min
May 28, 5:18 PM EDT	Special Weather Statement	MRX	Greene, Hamblen, Hancock, Hawkins, Jefferson	42 min
May 28, 5:35 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hawkins	40 min
May 28, 5:40 PM EDT	Special Weather Statement	MRX	Monroe, Polk	65 min
May 28, 5:58 PM EDT	Special Weather Statement	MRX	Carter, Sullivan, Washington	62 min
May 28, 6:42 PM EDT	Special Weather Statement	MRX	Carter, Johnson	48 min
May 28, 6:46 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Johnson	29 min
May 28, 3:38 PM EDT	Special Weather Statement	MRX	Washington	37 min
May 28, 6:29 PM EDT	Special Weather Statement	MRX	Cherokee, Clay	46 min
May 28, 7:28 PM EDT	Special Weather Statement	MRX	Clay	47 min

Nearby

Special Weather Statements in Tennessee, 2021 Every special weather statement in 2021

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.