Alert archive / Tennessee / Freeze Warnings in 2020

Freeze Warning 1, NWS Morristown, TN

April 10, 202016 counties in Tennessee; 7 counties in Virginia; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this freeze warning at Apr 10, 2020, 3:35 AM EDT for 16 counties in Tennessee; 7 counties in Virginia; Cherokee County, Clay County, North Carolina. It took effect at Apr 11, 2020, 4:00 AM EDT. It was in force for 6 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 10, 2020, 3:35 AM EDT (07:35 UTC)
In effect from: Apr 11, 2020, 4:00 AM EDT
Expired: Apr 11, 2020, 10:00 AM EDT
In force: 6 hr
Issued by: NWS Morristown, TN

All 25 counties

Cherokee County, NC, Clay County, NC, Anderson County, TN, Bledsoe County, TN, Campbell County, TN, Carter County, TN, Claiborne County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Morgan County, TN, Scott County, TN, Sequatchie County, TN, Sullivan County, TN, Union 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), 15 km from the middle of the area, began a volume at 07:33 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 00:00Z, 7.6 hours before the alert went out and 309 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: 3057 m above ground
0-6 km bulk shear: 86 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 273 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 10, 3:31 AM EDT, 4 minutes earlier.

Area forecast discussion, Apr 10, 3:31 AM EDT, 4 minutes before

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Hazardous weather outlook, Apr 9, 4:06 AM EDT, 23 hours 29 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 10, 3:32 PM EDT	Frost Advisory	MRX	Blount, Bradley, Cocke, Hamilton, Jefferson, Knox and 9 more	18 hr
Apr 10, 3:32 PM EDT	High Wind Watch	MRX	Blount, Carter, Cocke, Greene, Johnson, Monroe and 2 more	24 hr

Nearby

Freeze Warnings in Tennessee, 2020 Freeze Warnings in Virginia, 2020 Freeze Warnings in North Carolina, 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.