Alert archive / Tennessee / Flash Flood Watches in 2020

Flash Flood Watch 2, NWS Morristown, TN

February 10, 202027 counties in Tennessee; Lee County, Virginia; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this flash flood watch at Feb 10, 2020, 3:14 PM EST for 27 counties in Tennessee; Lee County, Virginia; Cherokee County, Clay County, North Carolina. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued
Feb 10, 2020, 3:14 PM EST (20:14 UTC)
Expired
Feb 11, 2020, 2:57 PM EST
In force
24 hr
Issued by
NWS Morristown, TN
All 30 counties

Cherokee County, NC, Clay County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Claiborne County, TN, Cocke County, TN, Grainger County, TN, Hamblen County, TN, Hamilton County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Union County, TN, Lee County, VA

The radar

The Knoxville radar (KMRX), 79 km from the middle of the area, began a volume at 20:18 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

Birmingham, AL (KBMX), launched 12:00Z, 8.2 hours before the alert went out and 379 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, Birmingham, AL at 12:00Z on 2020-02-10Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2020-02-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 465 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
887 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
465 m²/s²
0-3 km storm-relative helicity
585 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Feb 10, 12:22 PM EST, 2 hours 52 minutes earlier.

Area forecast discussion, Feb 10, 12:22 PM EST, 2 hours 52 minutes before
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Hazardous weather outlook, Feb 10, 4:55 AM EST, 10 hours 19 minutes before
Hazardous Weather Outlook
National Weather Service Morristown TN
455 AM EST Mon Feb 10 2020

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-111000-
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-
455 AM EST Mon Feb 10 2020 /355 AM CST Mon Feb 10 2020/

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

.DAY ONE...Today and Tonight

Heavy rainfall will move into the area today ahead of a slow
moving frontal boundary. The main axis of heaviest rain will be
along and south of Interstate 40. Rainfall amounts of 2-4 inches
will be possible through tonight with locally higher amounts
possible. This rainfall will lead to additional flooding across
the area.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Heavy rainfall will continue into Tuesday with continued flooding
likely.

Another round of heavy rainfall is expected Wednesday into
Thursday as the front lifts northward across the region.
Widespread amounts of 2-3 inches will be possible.

Rainfall totals from Monday through Thursday will range from 3 to
6 inches.

Strong to severe thunderstorms may be possible Wednesday evening
through early Thursday morning. The primary hazard will be
damaging winds.

Mountain wave high winds are expected across the mountains and
foothills Wednesday afternoon through early Thursday morning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated at this time, but reports of
flooding or heavy rainfall are encouraged.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 10, 3:14 AM ESTWind AdvisoryMRXBlount, Cocke, Greene, Monroe, Sevier23 hr
Feb 10, 10:35 AM ESTRiver Flood WarningMRXHamilton4 days
Feb 10, 10:35 AM ESTRiver Flood WarningMRXCocke42 hr
Feb 10, 10:38 AM ESTRiver Flood WarningMRXBledsoe, Marion, Sequatchie4 days

Nearby

Flash Flood Watches in Tennessee, 2020Flash Flood Watches in North Carolina, 2020Flash Flood Watches in Virginia, 2020Every flash flood watch in 2020

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.