Alert archive / Tennessee / Frost Advisories in 2021

Frost Advisory 4, NWS Morristown, TN

April 22, 202120 counties in Tennessee; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this frost advisory at Apr 22, 2021, 3:12 AM EDT for 20 counties in Tennessee; Cherokee County, Clay County, North Carolina. It took effect at Apr 23, 2021, 2:00 AM EDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
Apr 22, 2021, 3:12 AM EDT (07:12 UTC)
In effect from
Apr 23, 2021, 2:00 AM EDT
Expired
Apr 23, 2021, 9:00 AM EDT
In force
7 hr
Issued by
NWS Morristown, TN
All 22 counties

Cherokee County, NC, Clay County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Campbell County, TN, Cocke County, TN, Grainger County, TN, Hamblen County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 80 km from the middle of the area, began a volume at 07:11 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 00:00Z, 7.2 hours before the alert went out and 221 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, Nashville Metro, TN at 00:00Z on 2021-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 00:00Z on 2021-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 square meters per square second.1939587897117136Sfc1 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2033 m above ground
0-6 km bulk shear
102 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
-4 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

687 
WWUS74 KMRX 220712
NPWMRX

URGENT - WEATHER MESSAGE
National Weather Service Morristown TN
312 AM EDT Thu Apr 22 2021

TNZ014>018-041>047-072-074-VAZ001-002-005-006-008-221515-
/O.NEW.KMRX.FZ.W.0005.210423T0600Z-210423T1300Z/
/O.CON.KMRX.FZ.W.0004.000000T0000Z-210422T1300Z/
Claiborne-Hancock-Hawkins-Sullivan-Johnson-Cocke Smoky Mountains-
Northwest Greene-Southeast Greene-Washington-Unicoi-
Northwest Carter-Southeast Carter-Blount Smoky Mountains-
Sevier Smoky Mountains-Lee-Wise-Scott-Russell-
Including the cities of Lone Mountain, Sandlick, Springdale, 
Arthur, Harrogate-Shawanee, Clairfield, Howard Quarter, Evanston,
Sneedville, Treadway, Kyles Ford, Mooresburg, Kingsport, 
Bristol TN, South Holston Dam, Doeville, Mountain City, Neva, 
Shady Valley, Trade, Laurel Bloomery, Hartford, Greeneville, 
Cedar Creek, Johnson City, Erwin, Unicoi, Limestone Cove, 
Elizabethton, Hampton, Cades Cove, Elkmont, Gatlinburg, 
Rose Hill, Big Stone Gap, Norton, Wise, Coeburn, Appalachia, 
Pardee, Hiltons, Hansonville, Lebanon, Dye, Castlewood, Honaker, 
Rosedale, Benhams, Bristol VA, and Abingdon
312 AM EDT Thu Apr 22 2021

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING...
...FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM EDT FRIDAY...

* WHAT...For the first Freeze Warning, sub-freezing temperatures 
  as low as 25. For the second Freeze Warning, sub-freezing 
  temperatures as low as 31 expected.

* WHERE...Portions of east Tennessee and southwest Virginia.

* WHEN...For the first Freeze Warning, until 9 AM EDT this 
  morning. For the second Freeze Warning, from 2 AM to 9 AM EDT 
  Friday.

* IMPACTS...Frost and freeze conditions could kill crops and other
  sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. Those that
have in-ground sprinkler systems should drain them and cover
above-ground pipes to protect them from freezing.

&&

$$

NCZ060-061-TNZ012-013-035>040-067>071-073-081>087-221515-
/O.NEW.KMRX.FR.Y.0004.210423T0600Z-210423T1300Z/
/O.CON.KMRX.FZ.W.0004.000000T0000Z-210422T1300Z/
Cherokee-Clay-Scott-Campbell-Morgan-Anderson-Union-Grainger-
Hamblen-Northwest Cocke-Roane-Loudon-Knox-Jefferson-
Northwest Blount-North Sevier-Sequatchie-Bledsoe-Rhea-Meigs-
McMinn-Northwest Monroe-Southeast Monroe-
Including the cities of Andrews, Marble, Topton, Hiawasse Dam, 
Murphy, Unaka, Violet, Shooting Creek, Brasstown, Hayesville, 
Tusquitee, Big South Fork National, Oneida, Smokey Junction, 
Elgin, Huntsville, Norma, Slick Rock, Fincastle, La Follette, 
Elk Valley, Jellico, White Oak, Caryville, Royal Blue, 
Pine Orchard, High Point, Petros, Oak Ridge, Clinton, 
Maynardville, Norris Lake, Paulette, Rose Hill, Sharps Chapel, 
Luttrell, Bean Station, Alpha, Morristown, Russellville, Bybee, 
Newport, Harriman, Eagle Furnace, Rockwood, Bradbury, Fairview, 
Kingston, Oliver Springs, Lenoir City, Loudon, Bearden, 
Knoxville, Lake Forest, Jefferson City, Strawberry Plains, 
Chestnut Hill, Dandridge, White Pine, Happy Valley, Maryville, 
Alcoa, Harrisburg, Kodak, McMahan, Sevierville, Seymour, 
Pigeon Forge, Cagle, Dunlap, Cartwright, Lone Oak, 
Old Cumberland, Palio, Melvine, Mount Crest, Pikeville, Brayton, 
Dayton, Evensville, Old Washington, Grandview, Spring City, 
Big Spring, Athens, Clear Water, Dentville, Etowah, Sweetwater, 
Madisonville, Bullet Creek, Citico, and Coker Creek
312 AM EDT Thu Apr 22 2021 /212 AM CDT Thu Apr 22 2021/

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM EDT /8 AM CDT/
THIS MORNING...
...FROST ADVISORY IN EFFECT FROM 2 AM EDT /1 AM CDT/ TO 9 AM EDT
/8 AM CDT/ FRIDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as 
  low as 29. For the Frost Advisory, temperatures as low as 35 
  will result in frost formation.

* WHERE...Portions of east Tennessee and southwest North 
  Carolina.

* WHEN...For the Freeze Warning, until 9 AM EDT /8 AM CDT/ this 
  morning. For the Frost Advisory, from 2 AM EDT /1 AM CDT/ to 9 
  AM EDT /8 AM CDT/ Friday.

* IMPACTS...Frost and freeze conditions could kill crops and other
  sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. Those that
have in-ground sprinkler systems should drain them and cover
above-ground pipes to protect them from freezing.

&&

$$

TNZ100>102-221300-
/O.CON.KMRX.FZ.W.0004.000000T0000Z-210422T1300Z/
Bradley-West Polk-East Polk-
Including the cities of Cleveland, Tasso, Conasauga, Archville, 
Benton, Parksville, Reliance, Big Frog Mountain, Ducktown, 
and Turtletown
312 AM EDT Thu Apr 22 2021

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 27 expected.

* WHERE...Portions of east Tennessee, southwest Virginia and 
  southwest North Carolina.

* WHEN...Through 9 AM EDT /8 AM CDT/ this morning.

* IMPACTS...Frost and freeze conditions could kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. Those that
have in-ground sprinkler systems should drain them and cover
above-ground pipes to protect them from freezing.

&&

$$

TNZ098-099-221300-
/O.CON.KMRX.FR.Y.0003.000000T0000Z-210422T1300Z/
Marion-Hamilton-
Including the cities of South Pittsburg, Haletown (Guild), 
Jasper, Martin Springs, Whitwell, Powells Crossroads, Monteagle, 
and Chattanooga
312 AM EDT Thu Apr 22 2021 /212 AM CDT Thu Apr 22 2021/

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM EDT /8 AM CDT/
THIS MORNING...

* WHAT...Temperatures as low as 33 will result in frost 
  formation.

* WHERE...Portions of southeast Tennessee.

* WHEN...Through 9 AM EDT /8 AM CDT/ this morning.

* IMPACTS...Frost could kill sensitive outdoor vegetation if 
  left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
5 follow-up statements
070 
WWUS74 KMRX 221356
NPWMRX

URGENT - WEATHER MESSAGE
National Weather Service Morristown TN
956 AM EDT Thu Apr 22 2021

TNZ014>018-041>047-072-074-VAZ001-002-005-006-008-230400-
/O.CON.KMRX.FZ.W.0005.210423T0600Z-210423T1300Z/
Claiborne-Hancock-Hawkins-Sullivan-Johnson-Cocke Smoky Mountains-
Northwest Greene-Southeast Greene-Washington-Unicoi-
Northwest Carter-Southeast Carter-Blount Smoky Mountains-
Sevier Smoky Mountains-Lee-Wise-Scott-Russell-
Including the cities of Lone Mountain, Sandlick, Springdale, 
Arthur, Harrogate-Shawanee, Clairfield, Howard Quarter, Evanston,
Sneedville, Treadway, Kyles Ford, Mooresburg, Kingsport, 
Bristol TN, South Holston Dam, Doeville, Mountain City, Neva, 
Shady Valley, Trade, Laurel Bloomery, Hartford, Greeneville, 
Cedar Creek, Johnson City, Erwin, Unicoi, Limestone Cove, 
Elizabethton, Hampton, Cades Cove, Elkmont, Gatlinburg, 
Rose Hill, Big Stone Gap, Norton, Wise, Coeburn, Appalachia, 
Pardee, Hiltons, Hansonville, Lebanon, Dye, Castlewood, Honaker, 
Rosedale, Benhams, Bristol VA, and Abingdon
956 AM EDT Thu Apr 22 2021

...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM EDT
FRIDAY...

* WHAT...Sub-freezing temperatures as low as 31 expected.

* WHERE...Portions of east Tennessee and southwest Virginia.

* WHEN...From 2 AM to 9 AM EDT Friday.

* IMPACTS...Frost and freeze conditions could kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. Those that
have in-ground sprinkler systems should drain them and cover
above-ground pipes to protect them from freezing.

&&

$$

NCZ060-061-TNZ012-013-035>040-067>071-073-081>087-230400-
/O.CON.KMRX.FR.Y.0004.210423T0600Z-210423T1300Z/
Cherokee-Clay-Scott-Campbell-Morgan-Anderson-Union-Grainger-
Hamblen-Northwest Cocke-Roane-Loudon-Knox-Jefferson-
Northwest Blount-North Sevier-Sequatchie-Bledsoe-Rhea-Meigs-
McMinn-Northwest Monroe-Southeast Monroe-
Including the cities of Andrews, Marble, Topton, Hiawasse Dam, 
Murphy, Unaka, Violet, Shooting Creek, Brasstown, Hayesville, 
Tusquitee, Big South Fork National, Oneida, Smokey Junction, 
Elgin, Huntsville, Norma, Slick Rock, Fincastle, La Follette, 
Elk Valley, Jellico, White Oak, Caryville, Royal Blue, 
Pine Orchard, High Point, Petros, Oak Ridge, Clinton, 
Maynardville, Norris Lake, Paulette, Rose Hill, Sharps Chapel, 
Luttrell, Bean Station, Alpha, Morristown, Russellville, Bybee, 
Newport, Harriman, Eagle Furnace, Rockwood, Bradbury, Fairview, 
Kingston, Oliver Springs, Lenoir City, Loudon, Bearden, 
Knoxville, Lake Forest, Jefferson City, Strawberry Plains, 
Chestnut Hill, Dandridge, White Pine, Maryville, Alcoa, 
Harrisburg, Kodak, McMahan, Sevierville, Seymour, Pigeon Forge, 
Cagle, Dunlap, Cartwright, Lone Oak, Old Cumberland, Palio, 
Melvine, Mount Crest, Pikeville, Brayton, Dayton, Evensville, 
Old Washington, Grandview, Spring City, Big Spring, Athens, 
Clear Water, Dentville, Etowah, Sweetwater, Madisonville, 
Bullet Creek, Citico, and Coker Creek
956 AM EDT Thu Apr 22 2021 /856 AM CDT Thu Apr 22 2021/

...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM EDT /1 AM CDT/ TO
9 AM EDT /8 AM CDT/ FRIDAY...

* WHAT...Temperatures as low as 35 will result in frost 
  formation.

* WHERE...Portions of east Tennessee and southwest North 
  Carolina.

* WHEN...From 2 AM EDT /1 AM CDT/ to 9 AM EDT /8 AM CDT/ Friday.

* IMPACTS...Frost and freeze conditions could kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
732 
WWUS74 KMRX 221932
NPWMRX

URGENT - WEATHER MESSAGE
National Weather Service Morristown TN
332 PM EDT Thu Apr 22 2021

TNZ014>018-041>047-072-074-VAZ001-002-005-006-008-230400-
/O.CON.KMRX.FZ.W.0005.210423T0600Z-210423T1300Z/
Claiborne-Hancock-Hawkins-Sullivan-Johnson-Cocke Smoky Mountains-
Northwest Greene-Southeast Greene-Washington-Unicoi-
Northwest Carter-Southeast Carter-Blount Smoky Mountains-
Sevier Smoky Mountains-Lee-Wise-Scott-Russell-
Including the cities of Lone Mountain, Sandlick, Springdale, 
Arthur, Harrogate-Shawanee, Clairfield, Howard Quarter, Evanston,
Sneedville, Treadway, Kyles Ford, Mooresburg, Kingsport, 
Bristol TN, South Holston Dam, Doeville, Mountain City, Neva, 
Shady Valley, Trade, Laurel Bloomery, Hartford, Greeneville, 
Cedar Creek, Johnson City, Erwin, Unicoi, Limestone Cove, 
Elizabethton, Hampton, Cades Cove, Elkmont, Gatlinburg, 
Rose Hill, Big Stone Gap, Norton, Wise, Coeburn, Appalachia, 
Pardee, Hiltons, Hansonville, Lebanon, Dye, Castlewood, Honaker, 
Rosedale, Benhams, Bristol VA, and Abingdon
332 PM EDT Thu Apr 22 2021

...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM EDT
FRIDAY...

* WHAT...Sub-freezing temperatures ranging from 28 to 32 degrees.

* WHERE...Portions of east Tennessee and southwest Virginia.

* WHEN...From 2 AM to 9 AM EDT Friday.

* IMPACTS...Frost and freeze conditions could kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. Those that
have in-ground sprinkler systems should drain them and cover
above-ground pipes to protect them from freezing.

&&

$$

NCZ060-061-TNZ012-013-035>040-067>071-073-081>087-230400-
/O.CON.KMRX.FR.Y.0004.210423T0600Z-210423T1300Z/
Cherokee-Clay-Scott-Campbell-Morgan-Anderson-Union-Grainger-
Hamblen-Northwest Cocke-Roane-Loudon-Knox-Jefferson-
Northwest Blount-North Sevier-Sequatchie-Bledsoe-Rhea-Meigs-
McMinn-Northwest Monroe-Southeast Monroe-
Including the cities of Andrews, Marble, Topton, Hiawasse Dam, 
Murphy, Unaka, Violet, Shooting Creek, Brasstown, Hayesville, 
Tusquitee, Big South Fork National, Oneida, Smokey Junction, 
Elgin, Huntsville, Norma, Slick Rock, Fincastle, La Follette, 
Elk Valley, Jellico, White Oak, Caryville, Royal Blue, 
Pine Orchard, High Point, Petros, Oak Ridge, Clinton, 
Maynardville, Norris Lake, Paulette, Rose Hill, Sharps Chapel, 
Luttrell, Bean Station, Alpha, Morristown, Russellville, Bybee, 
Newport, Harriman, Eagle Furnace, Rockwood, Bradbury, Fairview, 
Kingston, Oliver Springs, Lenoir City, Loudon, Bearden, 
Knoxville, Lake Forest, Jefferson City, Strawberry Plains, 
Chestnut Hill, Dandridge, White Pine, Maryville, Alcoa, 
Harrisburg, Kodak, McMahan, Sevierville, Seymour, Pigeon Forge, 
Cagle, Dunlap, Cartwright, Lone Oak, Old Cumberland, Palio, 
Melvine, Mount Crest, Pikeville, Brayton, Dayton, Evensville, 
Old Washington, Grandview, Spring City, Big Spring, Athens, 
Clear Water, Dentville, Etowah, Sweetwater, Madisonville, 
Bullet Creek, Citico, and Coker Creek
332 PM EDT Thu Apr 22 2021 /232 PM CDT Thu Apr 22 2021/

...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM EDT /1 AM CDT/ TO
9 AM EDT /8 AM CDT/ FRIDAY...

* WHAT...Temperatures as low as 35 will result in frost 
  formation.

* WHERE...Portions of east Tennessee and southwest North 
  Carolina.

* WHEN...From 2 AM EDT /1 AM CDT/ to 9 AM EDT /8 AM CDT/ Friday.

* IMPACTS...Frost and freeze conditions could kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
213 
WWUS74 KMRX 230137 AAA
NPWMRX

URGENT - WEATHER MESSAGE...UPDATED
National Weather Service Morristown TN
937 PM EDT Thu Apr 22 2021

TNZ014>018-041>047-072-074-VAZ001-002-005-006-008-231000-
/O.CON.KMRX.FZ.W.0005.210423T0600Z-210423T1300Z/
Claiborne-Hancock-Hawkins-Sullivan-Johnson-Cocke Smoky Mountains-
Northwest Greene-Southeast Greene-Washington-Unicoi-
Northwest Carter-Southeast Carter-Blount Smoky Mountains-
Sevier Smoky Mountains-Lee-Wise-Scott-Russell-
Including the cities of Lone Mountain, Sandlick, Springdale, 
Arthur, Harrogate-Shawanee, Clairfield, Howard Quarter, Evanston,
Sneedville, Treadway, Kyles Ford, Mooresburg, Kingsport, 
Bristol TN, South Holston Dam, Doeville, Mountain City, Neva, 
Shady Valley, Trade, Laurel Bloomery, Hartford, Greeneville, 
Cedar Creek, Johnson City, Erwin, Unicoi, Limestone Cove, 
Elizabethton, Hampton, Cades Cove, Elkmont, Gatlinburg, 
Rose Hill, Big Stone Gap, Norton, Wise, Coeburn, Appalachia, 
Pardee, Hiltons, Hansonville, Lebanon, Dye, Castlewood, Honaker, 
Rosedale, Benhams, Bristol VA, and Abingdon
937 PM EDT Thu Apr 22 2021

...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM EDT
FRIDAY...

* WHAT...Sub-freezing temperatures ranging from 28 to 32 degrees.

* WHERE...Portions of east Tennessee and southwest Virginia.

* WHEN...From 2 AM to 9 AM EDT Friday.

* IMPACTS...Frost and freeze conditions could kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. Those that
have in-ground sprinkler systems should drain them and cover
above-ground pipes to protect them from freezing.

&&

$$

NCZ060-061-TNZ012-013-035>040-067>071-073-081>087-231000-
/O.CON.KMRX.FR.Y.0004.210423T0600Z-210423T1300Z/
Cherokee-Clay-Scott-Campbell-Morgan-Anderson-Union-Grainger-
Hamblen-Northwest Cocke-Roane-Loudon-Knox-Jefferson-
Northwest Blount-North Sevier-Sequatchie-Bledsoe-Rhea-Meigs-
McMinn-Northwest Monroe-Southeast Monroe-
Including the cities of Andrews, Marble, Topton, Hiawasse Dam, 
Murphy, Unaka, Violet, Shooting Creek, Brasstown, Hayesville, 
Tusquitee, Big South Fork National, Oneida, Smokey Junction, 
Elgin, Huntsville, Norma, Slick Rock, Fincastle, La Follette, 
Elk Valley, Jellico, White Oak, Caryville, Royal Blue, 
Pine Orchard, High Point, Petros, Oak Ridge, Clinton, 
Maynardville, Norris Lake, Paulette, Rose Hill, Sharps Chapel, 
Luttrell, Bean Station, Alpha, Morristown, Russellville, Bybee, 
Newport, Harriman, Eagle Furnace, Rockwood, Bradbury, Fairview, 
Kingston, Oliver Springs, Lenoir City, Loudon, Bearden, 
Knoxville, Lake Forest, Jefferson City, Strawberry Plains, 
Chestnut Hill, Dandridge, White Pine, Maryville, Alcoa, 
Harrisburg, Kodak, McMahan, Sevierville, Seymour, Pigeon Forge, 
Cagle, Dunlap, Cartwright, Lone Oak, Old Cumberland, Palio, 
Melvine, Mount Crest, Pikeville, Brayton, Dayton, Evensville, 
Old Washington, Grandview, Spring City, Big Spring, Athens, 
Clear Water, Dentville, Etowah, Sweetwater, Madisonville, 
Bullet Creek, Citico, and Coker Creek
937 PM EDT Thu Apr 22 2021 /837 PM CDT Thu Apr 22 2021/

...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM EDT /1 AM CDT/ TO
9 AM EDT /8 AM CDT/ FRIDAY...

* WHAT...Temperatures as low as 35 will result in frost 
  formation.

* WHERE...Portions of east Tennessee and southwest North 
  Carolina.

* WHEN...From 2 AM EDT /1 AM CDT/ to 9 AM EDT /8 AM CDT/ Friday.

* IMPACTS...Frost and freeze conditions could kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
029 
WWUS74 KMRX 230714
NPWMRX

URGENT - WEATHER MESSAGE
National Weather Service Morristown TN
314 AM EDT Fri Apr 23 2021

TNZ041-043-045-047-072-074-231500-
/O.NEW.KMRX.HW.A.0006.210424T1200Z-210425T0000Z/
/O.CON.KMRX.FZ.W.0005.000000T0000Z-210423T1300Z/
Cocke Smoky Mountains-Southeast Greene-Unicoi-Southeast Carter-
Blount Smoky Mountains-Sevier Smoky Mountains-
Including the cities of Hartford, Cedar Creek, Erwin, Unicoi, 
Limestone Cove, Hampton, Cades Cove, Elkmont, and Gatlinburg
314 AM EDT Fri Apr 23 2021

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING...
...HIGH WIND WATCH IN EFFECT FROM SATURDAY MORNING THROUGH
SATURDAY EVENING...

* WHAT...For the Freeze Warning, sub-freezing temperatures as low
  as 32. For the High Wind Watch, south winds 25 to 40 mph with 
  gusts up to 60 mph possible.

* WHERE...Portions of east Tennessee.

* WHEN...For the Freeze Warning, until 9 AM EDT this morning. 
  For the High Wind Watch, from Saturday morning through 
  Saturday evening.

* IMPACTS...Damaging winds could blow down trees and power lines.
  Widespread power outages are possible. Travel could be
  difficult, especially for high profile vehicles. Frost and
  freeze conditions could kill crops and other sensitive
  vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts and warnings for updates on this
situation. Fasten loose objects or shelter objects in a safe
location prior to the onset of winds.

&&

$$

TNZ014>018-042-044-046-VAZ001-002-005-006-008-231300-
/O.CON.KMRX.FZ.W.0005.000000T0000Z-210423T1300Z/
Claiborne-Hancock-Hawkins-Sullivan-Johnson-Northwest Greene-
Washington-Northwest Carter-Lee-Wise-Scott-Russell-
Including the cities of Lone Mountain, Sandlick, Springdale, 
Arthur, Harrogate-Shawanee, Clairfield, Howard Quarter, Evanston,
Sneedville, Treadway, Kyles Ford, Mooresburg, Kingsport, 
Bristol TN, South Holston Dam, Doeville, Mountain City, Neva, 
Shady Valley, Trade, Laurel Bloomery, Greeneville, Johnson City, 
Elizabethton, Rose Hill, Big Stone Gap, Norton, Wise, Coeburn, 
Appalachia, Pardee, Hiltons, Hansonville, Lebanon, Dye, 
Castlewood, Honaker, Rosedale, Benhams, Bristol VA, and Abingdon
314 AM EDT Fri Apr 23 2021

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 31.

* WHERE...Portions of east Tennessee and southwest Virginia.

* WHEN...Until 9 AM EDT this morning.

* IMPACTS...Frost and freeze conditions could kill crops and 
  other sensitive vegetation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. Those that
have in-ground sprinkler systems should drain them and cover
above-ground pipes to protect them from freezing.

&&

$$

TNZ087-231500-
/O.NEW.KMRX.HW.A.0006.210424T1200Z-210425T0000Z/
/O.CON.KMRX.FR.Y.0004.000000T0000Z-210423T1300Z/
Southeast Monroe-
Including the cities of Citico and Coker Creek
314 AM EDT Fri Apr 23 2021

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING...
...HIGH WIND WATCH IN EFFECT FROM SATURDAY MORNING THROUGH
SATURDAY EVENING...

* WHAT...For the Frost Advisory, temperatures as low as 37 will
  result in frost formation. For the High Wind Watch, south winds
  25 to 35 mph with gusts up to 50 mph possible.

* WHERE...Southeast Monroe County.

* WHEN...For the Frost Advisory, until 9 AM EDT this morning. 
  For the High Wind Watch, from Saturday morning through 
  Saturday evening.

* IMPACTS...Damaging winds could blow down trees and power lines.
  Widespread power outages are possible. Travel could be
  difficult, especially for high profile vehicles. Frost could
  kill sensitive outdoor vegetation if left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts and warnings for updates on this
situation. Fasten loose objects or shelter objects in a safe
location prior to the onset of winds.

&&

$$

NCZ060-061-TNZ012-013-035>040-067>071-073-081>086-231300-
/O.CON.KMRX.FR.Y.0004.000000T0000Z-210423T1300Z/
Cherokee-Clay-Scott-Campbell-Morgan-Anderson-Union-Grainger-
Hamblen-Northwest Cocke-Roane-Loudon-Knox-Jefferson-
Northwest Blount-North Sevier-Sequatchie-Bledsoe-Rhea-Meigs-
McMinn-Northwest Monroe-
Including the cities of Andrews, Marble, Topton, Hiawasse Dam, 
Murphy, Unaka, Violet, Shooting Creek, Brasstown, Hayesville, 
Tusquitee, Big South Fork National, Oneida, Smokey Junction, 
Elgin, Huntsville, Norma, Slick Rock, Fincastle, La Follette, 
Elk Valley, Jellico, White Oak, Caryville, Royal Blue, 
Pine Orchard, High Point, Petros, Oak Ridge, Clinton, 
Maynardville, Norris Lake, Paulette, Rose Hill, Sharps Chapel, 
Luttrell, Bean Station, Alpha, Morristown, Russellville, Bybee, 
Newport, Harriman, Eagle Furnace, Rockwood, Bradbury, Fairview, 
Kingston, Oliver Springs, Lenoir City, Loudon, Bearden, 
Knoxville, Lake Forest, Jefferson City, Strawberry Plains, 
Chestnut Hill, Dandridge, White Pine, Maryville, Alcoa, 
Harrisburg, Kodak, McMahan, Sevierville, Seymour, Pigeon Forge, 
Cagle, Dunlap, Cartwright, Lone Oak, Old Cumberland, Palio, 
Melvine, Mount Crest, Pikeville, Brayton, Dayton, Evensville, 
Old Washington, Grandview, Spring City, Big Spring, Athens, 
Clear Water, Dentville, Etowah, Sweetwater, Madisonville, 
and Bullet Creek
314 AM EDT Fri Apr 23 2021 /214 AM CDT Fri Apr 23 2021/

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM EDT /8 AM CDT/
THIS MORNING...

* WHAT...Temperatures as low as 35 will result in frost 
  formation.

* WHERE...Portions of east Tennessee and southwest North 
  Carolina.

* WHEN...Until 9 AM EDT /8 AM CDT/ this morning.

* IMPACTS...Frost could kill sensitive outdoor vegetation if 
  left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
885 
WWUS74 KMRX 231309
NPWMRX

URGENT - WEATHER MESSAGE
National Weather Service Morristown TN
909 AM EDT Fri Apr 23 2021

TNZ041-043-045-047-072-074-232115-
/O.EXP.KMRX.FZ.W.0005.000000T0000Z-210423T1300Z/
/O.CON.KMRX.HW.A.0006.210424T1200Z-210425T0000Z/
Cocke Smoky Mountains-Southeast Greene-Unicoi-Southeast Carter-
Blount Smoky Mountains-Sevier Smoky Mountains-
Including the cities of Hartford, Cedar Creek, Erwin, Unicoi, 
Limestone Cove, Hampton, Cades Cove, Elkmont, and Gatlinburg
909 AM EDT Fri Apr 23 2021

...HIGH WIND WATCH REMAINS IN EFFECT FROM SATURDAY MORNING
THROUGH SATURDAY EVENING...
...FREEZE WARNING HAS EXPIRED...

* WHAT...South winds 25 to 40 mph with gusts up to 60 mph 
  possible.

* WHERE...Portions of east Tennessee.

* WHEN...From Saturday morning through Saturday evening.

* IMPACTS...Damaging winds could blow down trees and power 
  lines. Widespread power outages are possible. Travel could be 
  difficult, especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts and warnings for updates on this
situation. Fasten loose objects or shelter objects in a safe
location prior to the onset of winds.

&&

$$

TNZ014>018-042-044-046-VAZ001-002-005-006-008-231415-
/O.EXP.KMRX.FZ.W.0005.000000T0000Z-210423T1300Z/
Claiborne-Hancock-Hawkins-Sullivan-Johnson-Northwest Greene-
Washington-Northwest Carter-Lee-Wise-Scott-Russell-
Including the cities of Lone Mountain, Sandlick, Springdale, 
Arthur, Harrogate-Shawanee, Clairfield, Howard Quarter, Evanston,
Sneedville, Treadway, Kyles Ford, Mooresburg, Kingsport, 
Bristol TN, South Holston Dam, Doeville, Mountain City, Neva, 
Shady Valley, Trade, Laurel Bloomery, Greeneville, Johnson City, 
Elizabethton, Rose Hill, Big Stone Gap, Norton, Wise, Coeburn, 
Appalachia, Pardee, Hiltons, Hansonville, Lebanon, Dye, 
Castlewood, Honaker, Rosedale, Benhams, Bristol VA, and Abingdon
909 AM EDT Fri Apr 23 2021

...FREEZE WARNING HAS EXPIRED...

Temperatures have risen above freezing. 

$$

TNZ087-232115-
/O.EXP.KMRX.FR.Y.0004.000000T0000Z-210423T1300Z/
/O.CON.KMRX.HW.A.0006.210424T1200Z-210425T0000Z/
Southeast Monroe-
Including the cities of Citico and Coker Creek
909 AM EDT Fri Apr 23 2021

...HIGH WIND WATCH REMAINS IN EFFECT FROM SATURDAY MORNING
THROUGH SATURDAY EVENING...
...FROST ADVISORY HAS EXPIRED...

* WHAT...South winds 25 to 35 mph with gusts up to 50 mph 
  possible.

* WHERE...Southeast Monroe County.

* WHEN...From Saturday morning through Saturday evening.

* IMPACTS...Damaging winds could blow down trees and power 
  lines. Widespread power outages are possible. Travel could be 
  difficult, especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts and warnings for updates on this
situation. Fasten loose objects or shelter objects in a safe
location prior to the onset of winds.

&&

$$

NCZ060-061-TNZ012-013-035>040-067>071-073-081>086-231415-
/O.EXP.KMRX.FR.Y.0004.000000T0000Z-210423T1300Z/
Cherokee-Clay-Scott-Campbell-Morgan-Anderson-Union-Grainger-
Hamblen-Northwest Cocke-Roane-Loudon-Knox-Jefferson-
Northwest Blount-North Sevier-Sequatchie-Bledsoe-Rhea-Meigs-
McMinn-Northwest Monroe-
Including the cities of Andrews, Marble, Topton, Hiawasse Dam, 
Murphy, Unaka, Violet, Shooting Creek, Brasstown, Hayesville, 
Tusquitee, Big South Fork National, Oneida, Smokey Junction, 
Elgin, Huntsville, Norma, Slick Rock, Fincastle, La Follette, 
Elk Valley, Jellico, White Oak, Caryville, Royal Blue, 
Pine Orchard, High Point, Petros, Oak Ridge, Clinton, 
Maynardville, Norris Lake, Paulette, Rose Hill, Sharps Chapel, 
Luttrell, Bean Station, Alpha, Morristown, Russellville, Bybee, 
Newport, Harriman, Eagle Furnace, Rockwood, Bradbury, Fairview, 
Kingston, Oliver Springs, Lenoir City, Loudon, Bearden, 
Knoxville, Lake Forest, Jefferson City, Strawberry Plains, 
Chestnut Hill, Dandridge, White Pine, Maryville, Alcoa, 
Harrisburg, Kodak, McMahan, Sevierville, Seymour, Pigeon Forge, 
Cagle, Dunlap, Cartwright, Lone Oak, Old Cumberland, Palio, 
Melvine, Mount Crest, Pikeville, Brayton, Dayton, Evensville, 
Old Washington, Grandview, Spring City, Big Spring, Athens, 
Clear Water, Dentville, Etowah, Sweetwater, Madisonville, 
and Bullet Creek
909 AM EDT Fri Apr 23 2021 /809 AM CDT Fri Apr 23 2021/

...FROST ADVISORY HAS EXPIRED...

The risk of frost has ended due to cloud cover and warming
temperatures.

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 22, 3:12 AM EDTFreeze WarningMRXBlount, Carter, Claiborne, Cocke, Greene, Hancock and 6 more30 hr

Nearby

Frost Advisories in Tennessee, 2021Frost Advisories in North Carolina, 2021Every frost advisory 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.