Alert archive / Tennessee / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 141, NWS Morristown, TN

August 23, 2013Hamilton County, Marion County, Sequatchie County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Aug 23, 2013, 7:11 PM EDT for Hamilton County, Marion County, Sequatchie County, Tennessee. It was in force for 64 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: Aug 23, 2013, 7:11 PM EDT (23:11 UTC)
Expired: Aug 23, 2013, 8:15 PM EDT
In force: 64 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Hamilton County, TN, Marion County, TN, Sequatchie County, TN

The radar

The Northeast Alabama radar (KHTX), 70 km from the middle of the area, began a volume at 23:13 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, 11.2 hours before the alert went out and 148 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: 2024 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 743 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 23 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 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 Aug 23, 2:51 PM EDT, 4 hours 20 minutes earlier.

Area forecast discussion, Aug 23, 2:51 PM EDT, 4 hours 20 minutes before

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Hazardous weather outlook, Aug 23, 6:30 PM EDT, 41 minutes before

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In the hours before

Local storm report, Aug 23, 5:02 PM EDT, 2 hours 9 minutes before

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Local storm report, Aug 23, 5:36 PM EDT, 1 hour 35 minutes before

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Special weather statement, Aug 23, 5:49 PM EDT, 1 hour 22 minutes before

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Local storm report, Aug 23, 5:58 PM EDT, 1 hour 13 minutes before

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Local storm report, Aug 23, 6:01 PM EDT, 1 hour 10 minutes before

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Local storm report, Aug 23, 7:10 PM EDT, 1 minute 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
Aug 23, 4:19 PM EDT	Severe Thunderstorm Warning	MRX	Loudon, Roane	41 min
Aug 23, 4:31 PM EDT	Severe Thunderstorm Warning	MRX	Sevier	44 min
Aug 23, 4:44 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Loudon	46 min
Aug 23, 5:02 PM EDT	Severe Thunderstorm Warning	MRX	Loudon, Monroe	58 min
Aug 23, 6:22 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, Meigs	53 min
Aug 23, 6:26 PM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Rhea	64 min
Aug 23, 6:37 PM EDT	Areal Flood Advisory	MRX	Bledsoe, Rhea	113 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2013 Every severe thunderstorm warning in 2013

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.