Alert archive / Tennessee / Flood Watches in 2021

Flood Watch 2, NWS Morristown, TN

August 16, 202118 counties in Tennessee; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this flood watch at Aug 16, 2021, 2:06 PM EDT for 18 counties in Tennessee; Cherokee County, Clay County, North Carolina. It took effect at Aug 17, 2021, 8:00 AM EDT. It was in force for .

The area

The counties it named.

The facts

Issued
Aug 16, 2021, 2:06 PM EDT (18:06 UTC)
In effect from
Aug 17, 2021, 8:00 AM EDT
Expired
Aug 16, 2021, 2:38 PM EDT
In force
Issued by
NWS Morristown, TN
Flood severity
None

Counties Cherokee County, NC, Clay County, NC, Blount County, TN, Bradley County, TN, Carter County, TN, Cocke County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hamilton County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Monroe County, TN, Polk County, TN, Sevier County, TN, Unicoi County, TN, Washington County, TN

The radar

The Knoxville radar (KMRX), 62 km from the middle of the area, began a volume at 18:09 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, 6.1 hours before the alert went out and 257 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 12:00Z on 2021-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 109 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 12:00Z on 2021-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 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
109 J/kg
Mixed-layer CIN
-65 J/kg
Mixed-layer LCL
734 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

434 
WGUS64 KMRX 161806
FFAMRX

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Morristown TN
206 PM EDT Mon Aug 16 2021

NCZ060-061-TNZ038>047-068>074-085>087-098>102-170215-
/O.NEW.KMRX.FA.A.0002.210817T1200Z-210818T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cherokee-Clay-Grainger-Hamblen-Northwest Cocke-Cocke Smoky
Mountains-Northwest Greene-Southeast Greene-Washington-Unicoi-
Northwest Carter-Southeast Carter-Loudon-Knox-Jefferson-Northwest
Blount-Blount Smoky Mountains-North Sevier-Sevier Smoky Mountains-
McMinn-Northwest Monroe-Southeast Monroe-Marion-Hamilton-Bradley-
West Polk-East Polk-
Including the cities of White Pine, Russellville, Sweetwater,
Bybee, Knoxville, Bullet Creek, Gatlinburg, Topton, Reliance,
Dentville, Morristown, Conasauga, Strawberry Plains, Shooting
Creek, South Pittsburg, Monteagle, Loudon, Elizabethton, Cedar
Creek, Cades Cove, Chestnut Hill, Johnson City, Harrisburg,
Bearden, Murphy, Sevierville, Greeneville, Bean Station, Unaka,
Hartford, Andrews, Tasso, Athens, Alpha, Tusquitee, Elkmont,
Citico, Archville, Chattanooga, Pigeon Forge, Maryville, Powells
Crossroads, McMahan, Clear Water, Alcoa, Benton, Lake Forest,
Erwin, Jefferson City, Kodak, Parksville, Newport, Haletown
(Guild), Unicoi, Whitwell, Happy Valley, Etowah, Marble, Lenoir
City, Hampton, Coker Creek, Turtletown, Limestone Cove,
Brasstown, Dandridge, Big Frog Mountain, Seymour, Cleveland,
Hiawasse Dam, Jasper, Violet, Ducktown, Hayesville, Martin
Springs, and Madisonville
206 PM EDT Mon Aug 16 2021 /106 PM CDT Mon Aug 16 2021/

...FLOOD WATCH IN EFFECT FROM TUESDAY MORNING THROUGH WEDNESDAY 
MORNING...

The National Weather Service in Morristown has issued a

* Flood Watch for Portions of southwest North Carolina, including 
  the following areas, Cherokee and Clay. Portions of east 
  Tennessee, including the following areas, Blount Smoky Mountains, 
  Bradley, Cocke Smoky Mountains, East Polk, Grainger, Hamblen, 
  Hamilton, Jefferson, Knox, Loudon, Marion, McMinn, North Sevier, 
  Northwest Blount, Northwest Carter, Northwest Cocke, Northwest 
  Greene, Northwest Monroe, Sevier Smoky Mountains, Southeast 
  Carter, Southeast Greene, Southeast Monroe, Unicoi, Washington and 
  West Polk.

* From Tuesday morning through Wednesday morning.

* Heavy rains associated with the remnants of Tropical Storm Fred 
  are expected to lift north through the southern Appalachians and 
  portions of the Tennessee valley Tuesday and Tuesday night. Storm 
  total rainfall amounts of 2 to 3 inches are expected in the 
  Tennessee valley. In the higher terrain of western North Carolina 
  and the east Tennessee mountains, amounts of 3 to 4 inches are 
  expected, with locally higher amounts possible. Flash flooding is 
  expected to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be alert for possible Flood 
Warnings. Those living in areas prone to flooding should be prepared 
to take action should flooding develop.

&&

$$

CD
1 follow-up statement
481 
WGUS64 KMRX 161838
FFAMRX

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Morristown TN
238 PM EDT Mon Aug 16 2021

NCZ060-061-TNZ038>047-068>074-085>087-098>102-170400-
/O.CAN.KMRX.FA.A.0002.210817T1200Z-210818T1200Z/
/O.NEW.KMRX.FF.A.0008.210817T1200Z-210818T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cherokee-Clay-Grainger-Hamblen-Northwest Cocke-Cocke Smoky
Mountains-Northwest Greene-Southeast Greene-Washington-Unicoi-
Northwest Carter-Southeast Carter-Loudon-Knox-Jefferson-Northwest
Blount-Blount Smoky Mountains-North Sevier-Sevier Smoky Mountains-
McMinn-Northwest Monroe-Southeast Monroe-Marion-Hamilton-Bradley-
West Polk-East Polk-
Including the cities of White Pine, Russellville, Sweetwater,
Bybee, Knoxville, Bullet Creek, Gatlinburg, Topton, Reliance,
Dentville, Morristown, Conasauga, Strawberry Plains, Shooting
Creek, South Pittsburg, Monteagle, Loudon, Elizabethton, Cedar
Creek, Cades Cove, Chestnut Hill, Johnson City, Harrisburg,
Bearden, Murphy, Sevierville, Greeneville, Bean Station, Unaka,
Hartford, Andrews, Tasso, Athens, Alpha, Tusquitee, Elkmont,
Citico, Archville, Chattanooga, Pigeon Forge, Maryville, Powells
Crossroads, McMahan, Clear Water, Alcoa, Benton, Lake Forest,
Erwin, Jefferson City, Kodak, Parksville, Newport, Haletown
(Guild), Unicoi, Whitwell, Happy Valley, Etowah, Marble, Lenoir
City, Hampton, Coker Creek, Turtletown, Limestone Cove,
Brasstown, Dandridge, Big Frog Mountain, Seymour, Cleveland,
Hiawasse Dam, Jasper, Violet, Ducktown, Hayesville, Martin
Springs, and Madisonville
238 PM EDT Mon Aug 16 2021 /138 PM CDT Mon Aug 16 2021/

...FLASH FLOOD WATCH IN EFFECT FROM TUESDAY MORNING THROUGH 
WEDNESDAY MORNING...
...FLOOD WATCH IS CANCELLED...

The Flood Watch for Portions of southwest North Carolina, including 
the following areas, Cherokee and Clay. Portions of east Tennessee, 
including the following areas, Blount Smoky Mountains, Bradley, 
Cocke Smoky Mountains, East Polk, Grainger, Hamblen, Hamilton, 
Jefferson, Knox, Loudon, Marion, McMinn, North Sevier, Northwest 
Blount, Northwest Carter, Northwest Cocke, Northwest Greene, 
Northwest Monroe, Sevier Smoky Mountains, Southeast Carter, 
Southeast Greene, Southeast Monroe, Unicoi, Washington and West 
Polk. has been cancelled.

The Flood Watch has been replaced with a Flash Flood Watch.

The National Weather Service in Morristown has issued a

* Flash Flood Watch for Portions of southwest North Carolina, 
  including the following areas, Cherokee and Clay. Portions of east 
  Tennessee, including the following areas, Blount Smoky Mountains, 
  Bradley, Cocke Smoky Mountains, East Polk, Grainger, Hamblen, 
  Hamilton, Jefferson, Knox, Loudon, Marion, McMinn, North Sevier, 
  Northwest Blount, Northwest Carter, Northwest Cocke, Northwest 
  Greene, Northwest Monroe, Sevier Smoky Mountains, Southeast 
  Carter, Southeast Greene, Southeast Monroe, Unicoi, Washington and 
  West Polk.

* From Tuesday morning through Wednesday morning.

* Heavy rains associated with the remnants of Tropical Storm Fred 
  are expected to lift north through the southern Appalachians and 
  portions of the Tennessee valley Tuesday and Tuesday night. Storm 
  total rainfall amounts of 2 to 3 inches are expected in the 
  Tennessee valley. In the higher terrain of western North Carolina 
  and the east Tennessee mountains, amounts of 3 to 4 inches are 
  expected, with locally higher amounts possible. Flash flooding is 
  expected to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

$$

CD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 15, 10:48 PM EDTAreal Flood AdvisoryMRXBradley, Hamilton3 hr
Aug 16, 1:41 AM EDTAreal Flood AdvisoryMRXBradley, Hamilton109 min
Aug 16, 3:10 AM EDTAreal Flood AdvisoryMRXMonroe, Polk2 hr
Aug 16, 6:18 AM EDTAreal Flood AdvisoryMRXMarion, Sequatchie117 min
Aug 16, 8:51 AM EDTRiver Flood WarningMRXCocke56 hr
Aug 16, 2:38 PM EDTFlash Flood WatchMRXBlount, Bradley, Carter, Cocke, Grainger, Greene and 16 more33 hr
Aug 16, 4:25 PM EDTSpecial Weather StatementMRXMeigs, Rhea50 min
Aug 16, 4:28 PM EDTSpecial Weather StatementMRXMeigs47 min
Aug 16, 7:45 PM EDTAreal Flood AdvisoryMRXCocke, Greene3 hr

Nearby

Flood Watches in Tennessee, 2021Flood Watches in North Carolina, 2021Every flood watch 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.