Alert archive / Tennessee / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 31, NWS Morristown, TN

March 29, 202010 counties in Tennessee; Scott County, Virginia

NWS Morristown, TN issued this severe thunderstorm warning at Mar 29, 2020, 6:11 AM EDT for 10 counties in Tennessee; Scott County, Virginia. It was in force for 36 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, 6:11 AM EDT (10:11 UTC)
Expired: Mar 29, 2020, 6:47 AM EDT
In force: 36 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Blount County, TN, Cocke County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Knox County, TN, Sevier County, TN, Scott County, VA

The radar

The Knoxville radar (KMRX), 9 km from the middle of the area, began a volume at 10:15 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 00:00Z, 10.2 hours before the alert went out and 296 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: 251 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 1430 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 206 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.5

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, 10 hours 32 minutes earlier.

Area forecast discussion, Mar 28, 7:39 PM EDT, 10 hours 32 minutes before

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Hazardous weather outlook, Mar 28, 3:51 PM EDT, 14 hours 20 minutes before

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<body>
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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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, 6:38 AM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene, Hawkins, Sullivan, Washington	37 min
Mar 29, 7:06 AM EDT	Severe Thunderstorm Warning	MRX	Carter, Johnson, Sullivan, Unicoi, Washington	39 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.