Alert archive / Tennessee / Freeze Warnings in 2020

Freeze Warning 2, NWS Morristown, TN

April 14, 20209 counties in Tennessee; 7 counties in Virginia

NWS Morristown, TN issued this freeze warning at Apr 14, 2020, 3:40 PM EDT for 9 counties in Tennessee; 7 counties in Virginia. It took effect at Apr 15, 2020, 2:00 AM EDT. It was in force for 8 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: Apr 14, 2020, 3:40 PM EDT (19:40 UTC)
In effect from: Apr 15, 2020, 2:00 AM EDT
Expired: Apr 15, 2020, 10:00 AM EDT
In force: 8 hr
Issued by: NWS Morristown, TN

Counties Anderson County, TN, Bledsoe County, TN, Campbell County, TN, Claiborne County, TN, Hancock County, TN, Morgan County, TN, Scott County, TN, Sequatchie County, TN, Union 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), 31 km from the middle of the area, began a volume at 19:40 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

Nashville Metro, TN (KBNA), launched 12:00Z, 7.7 hours before the alert went out and 280 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: 1486 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: -99 m²/s²
0-3 km storm-relative helicity: 337 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 freeze 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 freeze warning went out at Apr 13, 7:12 PM EDT, 20 hours 28 minutes earlier.

Area forecast discussion, Apr 13, 7:12 PM EDT, 20 hours 28 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
Apr 14, 6:47 PM EDT	Areal Flood Warning	MRX	Marion	24 hr

Nearby

Freeze Warnings in Tennessee, 2020 Freeze Warnings in Virginia, 2020 Every freeze 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.