Alert archive / Tennessee / Flash Flood Watches in 2020
Flash Flood Watch 3, NWS Morristown, TN
NWS Morristown, TN issued this flash flood watch at Feb 12, 2020, 3:03 AM EST for 23 counties in Tennessee; Lee County, Virginia; Cherokee County, Clay County, North Carolina. It took effect at Feb 12, 2020, 7:00 PM EST. It was in force for 15 hr.
The area
The counties it named.
The facts
- Issued
- Feb 12, 2020, 3:03 AM EST (08:03 UTC)
- In effect from
- Feb 12, 2020, 7:00 PM EST
- Expired
- Feb 13, 2020, 10:00 AM EST
- In force
- 15 hr
- Issued by
- NWS Morristown, TN
- Flood severity
- None
All 26 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, Grainger County, TN, Hamilton County, TN, Hancock 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), 93 km from the middle of the area, began a volume at 08:02 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
Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 8.1 hours before the alert went out and 268 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.
- Mixed-layer CAPE
- 39 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 814 m above ground
- 0-6 km bulk shear
- 74 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 222 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 12, 12:36 AM EST, 2 hours 27 minutes earlier.
Area forecast discussion, Feb 12, 12:36 AM EST, 2 hours 27 minutes before
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</html>Hazardous weather outlook, Feb 11, 2:52 PM EST, 12 hours 11 minutes before
Hazardous Weather Outlook...UPDATED National Weather Service Morristown TN 252 PM EST Tue Feb 11 2020 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-121000- 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- 252 PM EST Tue Feb 11 2020 /152 PM CST Tue Feb 11 2020/ This Hazardous Weather Outlook is for portions of southwest North Carolina...east Tennessee and southwest Virginia. .DAY ONE...Tonight No hazardous weather is expected. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Another storm system will approach the Tennessee valley and southern Appalachians Wednesday and Wednesday night. This system will strength the winds across the area with southerly winds increasing to 25 to 40 mph with gusts up to 70 mph possible late Wednesday through early Thursday morning. A line of showers will cross the area Wednesday night into early Thursday morning. Locally heavy rainfall may be possible. Strong to marginally severe thunderstorms may also be possible in the southern Tennessee Valley, with the potential for isolated damaging wind gusts. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated at this time.
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.