Alert archive / Tennessee / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 161, NWS Morristown, TN

July 21, 20184 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 21, 2018, 4:05 AM EDT for 4 counties in Tennessee. It was in force for 40 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: Jul 21, 2018, 4:05 AM EDT (08:05 UTC)
Expired: Jul 21, 2018, 4:45 AM EDT
In force: 40 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Bradley County, TN, Hamilton County, TN, McMinn County, TN, Polk County, TN

The radar

The Northeast Alabama radar (KHTX), 122 km from the middle of the area, began a volume at 08:04 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 21, 3:00 AM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 8.1 hours before the alert went out and 192 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: 3305 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 1217 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: 2.2
Supercell composite: 11.6

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 Jul 21, 3:24 AM EDT, 41 minutes earlier.

Area forecast discussion, Jul 21, 3:24 AM EDT, 41 minutes before

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Hazardous weather outlook, Jul 21, 3:42 AM EDT, 23 minutes before

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In the hours before

Local storm report, Jul 21, 2:42 AM EDT, 1 hour 23 minutes before

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Local storm report, Jul 21, 2:46 AM EDT, 1 hour 19 minutes before

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Special weather statement, Jul 21, 2:54 AM EDT, 1 hour 11 minutes before

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Special weather statement, Jul 21, 3:10 AM EDT, 55 minutes before

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Local storm report, Jul 21, 3:37 AM EDT, 28 minutes before

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Local storm report, Jul 21, 3:55 AM EDT, 10 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
Jul 20, 9:02 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Hancock	58 min
Jul 20, 9:12 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Scott	48 min
Jul 20, 9:42 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Hamblen, Hawkins	63 min
Jul 20, 9:56 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Claiborne, Union	49 min
Jul 20, 10:10 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene, Jefferson, Sullivan, Unicoi, Washington	65 min
Jul 20, 10:17 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox, Sevier	58 min
Jul 20, 10:31 PM EDT	Tornado Warning	MRX	Bledsoe, Rhea	44 min
Jul 20, 10:44 PM EDT	Severe Thunderstorm Warning	MRX	Hamblen	16 min
Jul 20, 10:48 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Johnson, Unicoi	57 min
Jul 20, 11:10 PM EDT	Tornado Warning	MRX	Bledsoe, Meigs, Rhea	50 min
Jul 20, 11:13 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Sevier	32 min
Jul 20, 11:18 PM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Rhea	42 min
Jul 20, 11:42 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Meigs, Rhea	48 min
Jul 20, 11:47 PM EDT	Areal Flood Advisory	MRX	Bledsoe, Meigs, Rhea, Roane	3 hr
Jul 21, 12:02 AM EDT	Special Weather Statement	MRX	Bledsoe	43 min
Jul 21, 12:11 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Rhea, Sequatchie	49 min
Jul 21, 12:14 AM EDT	Special Weather Statement	MRX	Scott	46 min
Jul 21, 12:24 AM EDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Meigs, Polk	51 min
Jul 21, 12:55 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Meigs, Rhea	50 min
Jul 21, 12:58 AM EDT	Areal Flood Advisory	MRX	McMinn, Meigs, Rhea	3 hr
Jul 21, 12:58 AM EDT	Severe Thunderstorm Warning	MRX	Polk	62 min
Jul 21, 1:16 AM EDT	Areal Flood Advisory	MRX	Bledsoe, Rhea	3 hr
Jul 21, 1:21 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Rhea	39 min
Jul 21, 1:27 AM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Claiborne, Scott	48 min
Jul 21, 1:28 AM EDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn	47 min
Jul 21, 2:02 AM EDT	Severe Thunderstorm Warning	MRX	Bradley, Polk	28 min
Jul 21, 2:11 AM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Morgan, Roane, Scott	52 min
Jul 21, 2:16 AM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Claiborne, Grainger, Knox, Union	59 min
Jul 21, 2:39 AM EDT	Areal Flood Advisory	MRX	Bradley, McMinn, Polk	3 hr
Jul 21, 2:54 AM EDT	Special Weather Statement	MRX	Blount, Loudon, Roane	66 min
Jul 21, 3:06 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Rhea	39 min
Jul 21, 3:10 AM EDT	Special Weather Statement	MRX	Cocke, Grainger, Hamblen, Jefferson	50 min
Jul 21, 3:30 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Meigs, Rhea	45 min
Jul 21, 3:36 AM EDT	Areal Flood Warning	MRX	Bledsoe, Bradley, Hamilton, McMinn, Meigs, Rhea	3 hr
Jul 21, 3:41 AM EDT	Severe Thunderstorm Warning	MRX	Hamilton, Marion, Sequatchie	48 min
Jul 21, 3:53 AM EDT	Severe Thunderstorm Warning	MRX	McMinn, Monroe	41 min
Jul 21, 4:33 AM EDT	Areal Flood Advisory	MRX	Bradley, Hamilton, Marion, Polk	117 min
Jul 21, 6:39 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe	36 min
Jul 21, 7:05 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Meigs, Rhea	25 min
Jul 21, 7:24 AM EDT	Special Weather Statement	MRX	Bradley, Polk	36 min
Jul 21, 4:06 PM EDT	Special Weather Statement	MRX	Knox	39 min
Jul 21, 4:17 PM EDT	Special Weather Statement	MRX	Monroe	43 min
Jul 21, 4:45 PM EDT	Special Weather Statement	MRX	Hancock, Hawkins	60 min
Jul 21, 4:47 PM EDT	Special Weather Statement	MRX	Sevier	58 min
Jul 21, 5:12 PM EDT	Special Weather Statement	MRX	Bradley	63 min
Jul 21, 5:19 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, McMinn, Meigs	56 min
Jul 21, 5:33 PM EDT	Special Weather Statement	MRX	Monroe	42 min
Jul 21, 5:44 PM EDT	Special Weather Statement	MRX	Grainger	46 min
Jul 21, 5:49 PM EDT	Special Weather Statement	MRX	Bradley	26 min
Jul 21, 5:53 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton	37 min
Jul 21, 6:07 PM EDT	Special Weather Statement	MRX	Polk	53 min
Jul 21, 6:24 PM EDT	Special Weather Statement	MRX	Monroe	51 min
Jul 21, 6:26 PM EDT	Severe Thunderstorm Warning	MRX	Polk	49 min
Jul 21, 7:00 PM EDT	Special Weather Statement	MRX	Blount	30 min
Jul 21, 7:15 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Sevier	34 min
Jul 20, 8:14 PM EDT	Special Weather Statement	MRX	Scott, Wise, City of Norton	46 min
Jul 20, 9:23 PM EDT	Severe Thunderstorm Warning	MRX	Lee	37 min
Jul 20, 11:50 PM EDT	Areal Flood Advisory	MRX	Wise, City of Norton	3 hr
Jul 21, 4:15 PM EDT	Special Weather Statement	MRX	Russell	45 min
Jul 21, 4:59 PM EDT	Special Weather Statement	MRX	Scott	61 min
Jul 21, 5:43 PM EDT	Special Weather Statement	MRX	Russell	47 min
Jul 21, 6:34 PM EDT	Special Weather Statement	MRX	Smyth	41 min
Jul 21, 6:10 PM EDT	Special Weather Statement	MRX	Cherokee	50 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2018 Every severe thunderstorm warning in 2018

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.