Alert archive / Tennessee / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 33, NWS Morristown, TN

March 29, 20205 counties in Tennessee; Scott County, Washington County, City of Bristol, Virginia

NWS Morristown, TN issued this severe thunderstorm warning at Mar 29, 2020, 7:06 AM EDT for 5 counties in Tennessee; Scott County, Washington County, City of Bristol, Virginia. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Mar 29, 2020, 7:06 AM EDT (11:06 UTC)
Expired: Mar 29, 2020, 7:45 AM EDT
In force: 39 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Carter County, TN, Johnson County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN, City of Bristol, VA, Scott County, VA, Washington County, VA

The radar

The Knoxville radar (KMRX), 109 km from the middle of the area, began a volume at 11:07 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 11.1 hours before the alert went out and 357 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: 557 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1072 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: 183 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 4.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Mar 28, 7:39 PM EDT, 11 hours 27 minutes earlier.

Area forecast discussion, Mar 28, 7:39 PM EDT, 11 hours 27 minutes before

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Hazardous weather outlook, Mar 28, 3:51 PM EDT, 15 hours 15 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
Mar 29, 3:47 AM EDT	Severe Thunderstorm Warning	MRX	Morgan, Scott	43 min
Mar 29, 4:23 AM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Claiborne, Scott, Union	37 min
Mar 29, 4:31 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Rhea, Sequatchie	44 min
Mar 29, 5:09 AM EDT	Special Weather Statement	MRX	Roane	21 min
Mar 29, 5:23 AM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox, Loudon, Roane	37 min
Mar 29, 5:53 AM EDT	Special Weather Statement	MRX	Jefferson, Knox	37 min
Mar 29, 6:11 AM EDT	Severe Thunderstorm Warning	MRX	Blount, Cocke, Grainger, Greene, Hamblen, Hancock and 4 more	36 min
Mar 29, 6:38 AM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene, Hawkins, Sullivan, Washington	37 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2020 Severe Thunderstorm Warnings in Virginia, 2020 Every severe thunderstorm 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.