Alert archive / Tennessee / Frost Advisories in 2021

Frost Advisory 8, NWS Morristown, TN

November 3, 2021Anderson County, Union County, Tennessee; Washington County, City of Bristol, Virginia

NWS Morristown, TN issued this frost advisory at Nov 3, 2021, 4:02 PM EDT for Anderson County, Union County, Tennessee; Washington County, City of Bristol, Virginia. It took effect at Nov 4, 2021, 12:00 AM EDT. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued
Nov 3, 2021, 4:02 PM EDT (20:02 UTC)
In effect from
Nov 4, 2021, 12:00 AM EDT
Expired
Nov 4, 2021, 10:00 AM EDT
In force
10 hr
Issued by
NWS Morristown, TN

Counties Anderson County, TN, Union County, TN, City of Bristol, VA, Washington County, VA

The radar

The Knoxville radar (KMRX), 43 km from the middle of the area, began a volume at 20:01 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 8.0 hours before the alert went out and 285 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, Greensboro/Hi Pt, NC at 12:00Z on 2021-11-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Greensboro/Hi Pt, NC at 12:00Z on 2021-11-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -66 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1747 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
-66 m²/s²
0-3 km storm-relative helicity
119 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

328 
WWUS74 KMRX 032002
NPWMRX

URGENT - WEATHER MESSAGE
National Weather Service Morristown TN
402 PM EDT Wed Nov 3 2021

TNZ012>015-035-VAZ001-002-005-006-040415-
/O.CON.KMRX.FZ.W.0007.211104T0400Z-211104T1400Z/
Scott-Campbell-Claiborne-Hancock-Morgan-Lee-Wise-Russell-
Including the cities of Big South Fork National, Oneida, 
Smokey Junction, Elgin, Huntsville, Norma, Slick Rock, Fincastle,
La Follette, Elk Valley, Jellico, White Oak, Caryville, 
Royal Blue, Lone Mountain, Sandlick, Springdale, Arthur, 
Harrogate-Shawanee, Clairfield, Howard Quarter, Evanston, 
Sneedville, Kyles Ford, Pine Orchard, High Point, Petros, 
Rose Hill, Big Stone Gap, Norton, Wise, Coeburn, Appalachia, 
Pardee, Hiltons, Hansonville, Lebanon, Dye, Castlewood, Honaker, 
and Rosedale
402 PM EDT Wed Nov 3 2021

...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO
10 AM EDT THURSDAY...

* WHAT...Sub-freezing temperatures as low as 32 expected.

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

* WHEN...From Midnight tonight to 10 AM EDT Thursday.

* 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.

&&

$$

TNZ036-037-VAZ008-040415-
/O.NEW.KMRX.FR.Y.0008.211104T0400Z-211104T1400Z/
Anderson-Union-Washington-
Including the cities of Clinton, Maynardville, Norris Lake, 
Paulette, Rose Hill, Sharps Chapel, Luttrell, Benhams, 
Bristol VA, and Abingdon
402 PM EDT Wed Nov 3 2021

...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 10 AM EDT
THURSDAY...

* WHAT...Temperatures as low as 36 will result in frost 
  formation.

* WHERE...In Tennessee, Anderson and Union Counties. In 
  Virginia, Washington County.

* WHEN...From midnight tonight to 10 AM EDT Thursday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
2 follow-up statements
620 
WWUS74 KMRX 040145 AAA
NPWMRX

URGENT - WEATHER MESSAGE...UPDATED
National Weather Service Morristown TN
945 PM EDT Wed Nov 3 2021

TNZ012>015-035-VAZ001-002-005-006-041000-
/O.CON.KMRX.FZ.W.0007.211104T0400Z-211104T1400Z/
Scott-Campbell-Claiborne-Hancock-Morgan-Lee-Wise-Russell-
Including the cities of Big South Fork National, Oneida, 
Smokey Junction, Elgin, Huntsville, Norma, Slick Rock, Fincastle,
La Follette, Elk Valley, Jellico, White Oak, Caryville, 
Royal Blue, Lone Mountain, Sandlick, Springdale, Arthur, 
Harrogate-Shawanee, Clairfield, Howard Quarter, Evanston, 
Sneedville, Kyles Ford, Pine Orchard, High Point, Petros, 
Rose Hill, Big Stone Gap, Norton, Wise, Coeburn, Appalachia, 
Pardee, Hiltons, Hansonville, Lebanon, Dye, Castlewood, Honaker, 
and Rosedale
945 PM EDT Wed Nov 3 2021

...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM EDT THURSDAY...

* WHAT...Sub-freezing temperatures as low as 32 expected.

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

* WHEN...From Midnight tonight to 10 AM EDT Thursday.

* 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.

&&

$$

TNZ036-037-VAZ008-041000-
/O.CON.KMRX.FR.Y.0008.211104T0400Z-211104T1400Z/
Anderson-Union-Washington-
Including the cities of Clinton, Maynardville, Norris Lake, 
Paulette, Rose Hill, Sharps Chapel, Luttrell, Benhams, 
Bristol VA, and Abingdon
945 PM EDT Wed Nov 3 2021

...FROST ADVISORY REMAINS IN EFFECT UNTIL 10 AM EDT THURSDAY...

* WHAT...Temperatures as low as 36 will result in frost 
  formation.

* WHERE...In Tennessee, Anderson and Union Counties. In 
  Virginia, Washington County.

* WHEN...From midnight tonight to 10 AM EDT Thursday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
321 
WWUS74 KMRX 040659
NPWMRX

URGENT - WEATHER MESSAGE
National Weather Service Morristown TN
259 AM EDT Thu Nov 4 2021

TNZ012>015-035-VAZ001-002-005-006-041800-
/O.NEW.KMRX.FZ.W.0008.211105T0400Z-211105T1400Z/
/O.CON.KMRX.FZ.W.0007.000000T0000Z-211104T1400Z/
Scott-Campbell-Claiborne-Hancock-Morgan-Lee-Wise-Russell-
Including the cities of Big South Fork National, Oneida, 
Smokey Junction, Elgin, Huntsville, Norma, Slick Rock, Fincastle,
La Follette, Elk Valley, Jellico, White Oak, Caryville, 
Royal Blue, Lone Mountain, Sandlick, Springdale, Arthur, 
Harrogate-Shawanee, Clairfield, Howard Quarter, Evanston, 
Sneedville, Treadway, Kyles Ford, Pine Orchard, High Point, 
Petros, Rose Hill, Big Stone Gap, Norton, Wise, Coeburn, 
Appalachia, Pardee, Hiltons, Hansonville, Lebanon, Dye, 
Castlewood, Honaker, and Rosedale
259 AM EDT Thu Nov 4 2021

...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM EDT THIS
MORNING...
...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 10 AM EDT
FRIDAY...

* WHAT...For the first Freeze Warning, sub-freezing temperatures 
  as low as 31. For the second Freeze Warning, sub-freezing 
  temperatures as low as 28 expected.

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

* WHEN...For the first Freeze Warning, until 10 AM EDT this 
  morning. For the second Freeze Warning, from midnight tonight 
  to 10 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.

&&

$$

TNZ037-VAZ008-041800-
/O.NEW.KMRX.FZ.W.0008.211105T0400Z-211105T1400Z/
/O.CON.KMRX.FR.Y.0008.000000T0000Z-211104T1400Z/
Union-Washington-
Including the cities of Maynardville, Norris Lake, Paulette, 
Rose Hill, Sharps Chapel, Luttrell, Benhams, Bristol VA, 
and Abingdon
259 AM EDT Thu Nov 4 2021

...FROST ADVISORY REMAINS IN EFFECT UNTIL 10 AM EDT THIS
MORNING...
...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 10 AM EDT
FRIDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as 
  low as 28 expected. For the Frost Advisory, temperatures as 
  low as 36 will result in frost formation.

* WHERE...In Tennessee, Union County. In Virginia, Washington 
  County.

* WHEN...For the Freeze Warning, from midnight tonight to 10 AM 
  EDT Friday. For the Frost Advisory, until 10 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.

&&

$$

TNZ016>018-038-039-041>047-072-074-081-082-087-041800-
/O.NEW.KMRX.FZ.W.0008.211105T0400Z-211105T1400Z/
Hawkins-Sullivan-Johnson-Grainger-Hamblen-Cocke Smoky Mountains-
Northwest Greene-Southeast Greene-Washington-Unicoi-
Northwest Carter-Southeast Carter-Blount Smoky Mountains-
Sevier Smoky Mountains-Sequatchie-Bledsoe-Southeast Monroe-
Including the cities of Mooresburg, Kingsport, Bristol TN, 
South Holston Dam, Doeville, Mountain City, Neva, Shady Valley, 
Trade, Laurel Bloomery, Bean Station, Alpha, Morristown, 
Russellville, Hartford, Greeneville, Cedar Creek, Johnson City, 
Erwin, Unicoi, Limestone Cove, Elizabethton, Hampton, Cades Cove,
Elkmont, Gatlinburg, Cagle, Dunlap, Cartwright, Lone Oak, 
Old Cumberland, Palio, Melvine, Mount Crest, Pikeville, Brayton, 
Citico, and Coker Creek
259 AM EDT Thu Nov 4 2021 /159 AM CDT Thu Nov 4 2021/

...FREEZE WARNING IN EFFECT FROM MIDNIGHT EDT /11 PM CDT/ TONIGHT
TO 10 AM EDT /9 AM CDT/ FRIDAY...

* WHAT...Sub-freezing temperatures as low as 30 expected.

* WHERE...Portions of east Tennessee.

* WHEN...From midnight EDT /11 PM CDT/ tonight to 10 AM EDT /9 
  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.

&&

$$

TNZ036-041800-
/O.NEW.KMRX.FR.Y.0009.211105T0600Z-211105T1400Z/
/O.CON.KMRX.FR.Y.0008.000000T0000Z-211104T1400Z/
Anderson-
Including the cities of Oak Ridge and Clinton
259 AM EDT Thu Nov 4 2021

...FROST ADVISORY REMAINS IN EFFECT UNTIL 10 AM EDT THIS
MORNING...
...FROST ADVISORY IN EFFECT FROM 2 AM TO 10 AM EDT FRIDAY...

* WHAT...For the first Frost Advisory, temperatures as low as 36 
  will result in frost formation. For the second Frost Advisory, 
  temperatures as low as 33 will result in frost formation.

* WHERE...Anderson County.

* WHEN...For the first Frost Advisory, until 10 AM EDT this 
  morning. For the second Frost Advisory, from 2 AM to 10 AM EDT 
  Friday.

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


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

TNZ040-067>071-073-083>086-041800-
/O.NEW.KMRX.FR.Y.0009.211105T0600Z-211105T1400Z/
Northwest Cocke-Roane-Loudon-Knox-Jefferson-Northwest Blount-
North Sevier-Rhea-Meigs-McMinn-Northwest Monroe-
Including the cities of 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, Dayton, Evensville, 
Old Washington, Grandview, Spring City, Big Spring, Athens, 
Clear Water, Dentville, Etowah, Sweetwater, Madisonville, 
and Bullet Creek
259 AM EDT Thu Nov 4 2021

...FROST ADVISORY IN EFFECT FROM 2 AM TO 10 AM EDT FRIDAY...

* WHAT...Temperatures as low as 34 will result in frost 
  formation.

* WHERE...Portions of east Tennessee.

* WHEN...From 2 AM to 10 AM EDT Friday.

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


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NCZ060-061-TNZ098>102-041800-
/O.NEW.KMRX.FR.Y.0009.211105T0800Z-211105T1400Z/
Cherokee-Clay-Marion-Hamilton-Bradley-West Polk-East Polk-
Including the cities of Andrews, Marble, Topton, Hiawasse Dam, 
Murphy, Unaka, Violet, Shooting Creek, Brasstown, Hayesville, 
Tusquitee, South Pittsburg, Haletown (Guild), Jasper, 
Martin Springs, Whitwell, Powells Crossroads, Monteagle, 
Chattanooga, Cleveland, Tasso, Conasauga, Archville, Benton, 
Parksville, Reliance, Big Frog Mountain, Ducktown, and Turtletown
259 AM EDT Thu Nov 4 2021 /159 AM CDT Thu Nov 4 2021/

...FROST ADVISORY IN EFFECT FROM 4 AM EDT /3 AM CDT/ TO 10 AM EDT
/9 AM CDT/ FRIDAY...

* WHAT...Temperatures as low as 34 will result in frost 
  formation.

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

* WHEN...From 4 AM EDT /3 AM CDT/ to 10 AM EDT /9 AM CDT/ Friday.

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


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 3, 4:02 AM EDTFreeze WarningMRXCampbell, Claiborne, Hancock, Morgan, Scott30 hr

Nearby

Frost Advisories in Tennessee, 2021Frost Advisories in Virginia, 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.