Alert archive / Tennessee / Flood Watches in 2020

Flood Watch 2, NWS Morristown, TN

February 9, 202027 counties in Tennessee; Lee County, Virginia; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this flood watch at Feb 9, 2020, 3:35 AM EST for 27 counties in Tennessee; Lee County, Virginia; Cherokee County, Clay County, North Carolina. It took effect at Feb 10, 2020, 7:00 AM EST. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Feb 9, 2020, 3:35 AM EST (08:35 UTC)
In effect from: Feb 10, 2020, 7:00 AM EST
Expired: Feb 10, 2020, 3:14 PM EST
In force: 8 hr
Issued by: NWS Morristown, TN
Flood severity: None

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 08:35 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, 8.6 hours before the alert went out and 275 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 957 m above ground
0-6 km bulk shear: 83 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 145 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 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 flood watch went out at Feb 9, 1:56 AM EST, 1 hour 39 minutes earlier.

Area forecast discussion, Feb 9, 1:56 AM EST, 1 hour 39 minutes before

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Hazardous weather outlook, Feb 8, 3:42 PM EST, 11 hours 53 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 9, 1:24 AM EST	Freezing Fog Advisory	MRX	Blount, Bradley, Hamilton, Loudon, McMinn, Meigs and 5 more	8 hr

Nearby

Flood Watches in Tennessee, 2020 Flood Watches in North Carolina, 2020 Flood Watches in Virginia, 2020 Every 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.