Alert archive / Tennessee / Flood Watches in 2020

Flood Watch 4, NWS Morristown, TN

November 11, 20209 counties in Tennessee; Washington County, City of Bristol, Virginia

NWS Morristown, TN issued this flood watch at Nov 11, 2020, 2:05 PM EST for 9 counties in Tennessee; Washington County, City of Bristol, Virginia. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Nov 11, 2020, 2:05 PM EST (19:05 UTC)
Expired: Nov 12, 2020, 5:27 AM EST
In force: 15 hr
Issued by: NWS Morristown, TN
Flood severity: None

Counties Blount County, TN, Carter County, TN, Cocke County, TN, Greene County, TN, Johnson County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN, City of Bristol, VA, Washington County, VA

The radar

The Knoxville radar (KMRX), 71 km from the middle of the area, began a volume at 19:09 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 7.1 hours before the alert went out and 244 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: 101 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 514 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 223 m²/s²
0-3 km storm-relative helicity: 272 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 Nov 11, 12:26 PM EST, 1 hour 39 minutes earlier.

Area forecast discussion, Nov 11, 12:26 PM EST, 1 hour 39 minutes before

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Hazardous weather outlook, Nov 11, 3:03 AM EST, 11 hours 2 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
Nov 11, 12:07 PM EST	Areal Flood Advisory	MRX	Anderson, Campbell, Claiborne, Morgan, Scott	6 hr
Nov 11, 12:09 PM EST	Areal Flood Advisory	MRX	Bledsoe, Marion, Sequatchie	6 hr

Nearby

Flood Watches in Tennessee, 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.