Alert archive / Tennessee / Winter Storm Warnings in 2020

Winter Storm Warning 6, NWS Morristown, TN

December 23, 202012 counties in Tennessee; 7 counties in Virginia

NWS Morristown, TN issued this winter storm warning at Dec 23, 2020, 2:14 PM EST for 12 counties in Tennessee; 7 counties in Virginia. It took effect at Dec 24, 2020, 4:00 PM EST. It was in force for 12 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 23, 2020, 2:14 PM EST (19:14 UTC)
In effect from: Dec 24, 2020, 4:00 PM EST
Expired: Dec 25, 2020, 3:48 AM EST
In force: 12 hr
Issued by: NWS Morristown, TN

Counties Blount County, TN, Carter County, TN, Cocke County, TN, Greene County, TN, Hancock County, TN, Hawkins County, TN, Johnson County, TN, Monroe County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN, City of Bristol, VA, City of Norton, VA, Lee County, VA, Russell County, VA, Scott County, VA, Washington County, VA, Wise County, VA

The radar

The Knoxville radar (KMRX), 63 km from the middle of the area, began a volume at 19:18 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 7.2 hours before the alert went out and 258 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: 1585 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 141 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 winter storm warning 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 winter storm warning went out at Dec 23, 12:50 PM EST, 1 hour 24 minutes earlier.

Area forecast discussion, Dec 23, 12:50 PM EST, 1 hour 24 minutes before

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Hazardous weather outlook, Dec 23, 4:00 AM EST, 10 hours 14 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
Dec 23, 3:40 AM EST	High Wind Warning	MRX	Blount, Carter, Cocke, Greene, Johnson, Monroe and 2 more	30 hr
Dec 23, 3:49 AM EST	Winter Storm Watch	MRX	Blount, Carter, Cocke, Greene, Hancock, Hawkins and 5 more	10 hr
Dec 23, 2:14 PM EST	Winter Weather Advisory	MRX	Anderson, Bledsoe, Blount, Campbell, Claiborne, Cocke and 12 more	38 hr

Nearby

Winter Storm Warnings in Tennessee, 2020 Winter Storm Warnings in Virginia, 2020 Every winter storm warning 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.