Alert archive / Tennessee / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 155, NWS Morristown, TN

July 20, 20234 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 20, 2023, 12:15 PM CDT for 4 counties in Tennessee. It was in force for 25 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 20, 2023, 12:15 PM CDT (17:15 UTC)
Expired: Jul 20, 2023, 12:40 PM CDT
In force: 25 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Bledsoe County, TN, Meigs County, TN, Rhea County, TN, Roane County, TN

The radar

The Northeast Alabama radar (KHTX), 136 km from the middle of the area, began a volume at 17:18 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, 5.3 hours before the alert went out and 165 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: 1793 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 782 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 304 m²/s²
0-3 km storm-relative helicity: 309 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 11.4

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 20, 10:53 AM CDT, 1 hour 22 minutes earlier.

Area forecast discussion, Jul 20, 10:53 AM CDT, 1 hour 22 minutes before

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Hazardous weather outlook, Jul 20, 3:01 AM CDT, 9 hours 14 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
401 AM EDT Thu Jul 20 2023

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-210815-
Cherokee-Clay-Scott TN-Campbell-Claiborne-Hancock-Hawkins-
Sullivan-Johnson-Morgan-Anderson-Union-Grainger-Hamblen-
Northwest Cocke-Cocke Smoky Mountains-Northwest Greene-
Southeast Greene-Washington TN-Unicoi-Northwest Carter-
Southeast Carter-Roane-Loudon-Knox-Jefferson-Northwest Blount-
Blount Smoky Mountains-North Sevier-Sevier Smoky Mountains-
Sequatchie-Bledsoe-Rhea-Meigs-McMinn-Northwest Monroe-
Southeast Monroe-Marion-Hamilton-Bradley-West Polk-East Polk-Lee-
Wise-Scott VA-Russell-Washington VA-
401 AM EDT Thu Jul 20 2023 /301 AM CDT Thu Jul 20 2023/

This Hazardous Weather Outlook is for portions of southwest North
Carolina...east Tennessee and southwest Virginia.

.DAY ONE...Today and Tonight

Showers and thunderstorms are expected to develop and move into
the Cumberland Plateau and central Tennessee Valley this morning.
These storms will be capable of producing heavy rainfall, which
may lead to flash flooding. Strong wind gusts may also be possible
with a few storms.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Showers and thunderstorms are expected primarily for the southern
Tennessee valley Friday afternoon. These storms will be capable
of heavy rainfall, which may lead to isolated flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed today and Friday.

In the hours before

Local storm report, Jul 20, 8:49 AM CDT, 3 hours 26 minutes before

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Local storm report, Jul 20, 9:27 AM CDT, 2 hours 48 minutes before

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Local storm report, Jul 20, 10:04 AM CDT, 2 hours 11 minutes before

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Special weather statement, Jul 20, 10:12 AM CDT, 2 hours 3 minutes before

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Local storm report, Jul 20, 10:27 AM CDT, 1 hour 48 minutes before

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Special weather statement, Jul 20, 11:28 AM CDT, 47 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, 2:49 AM CDT	Flood Watch	MRX	Anderson, Bledsoe, Blount, Campbell, Knox, Loudon and 8 more	16 hr
Jul 20, 6:58 AM CDT	Areal Flood Advisory	MRX	Blount, Knox, Sevier	3 hr
Jul 20, 7:05 AM CDT	Areal Flood Advisory	MRX	Anderson, Campbell, Morgan, Scott	3 hr
Jul 20, 7:28 AM CDT	Areal Flood Advisory	MRX	Sevier	5 hr
Jul 20, 7:39 AM CDT	Special Weather Statement	MRX	Loudon, Monroe, Roane	51 min
Jul 20, 7:49 AM CDT	Flash Flood Warning	MRX	Blount, Knox, Sevier	4 hr
Jul 20, 8:06 AM CDT	Special Weather Statement	MRX	Bledsoe, Rhea	54 min
Jul 20, 8:29 AM CDT	Flash Flood Warning	MRX	Blount, Sevier	4 hr
Jul 20, 8:40 AM CDT	Areal Flood Advisory	MRX	Anderson, Blount, Knox, Loudon, Meigs, Monroe and 3 more	4 hr
Jul 20, 9:08 AM CDT	Areal Flood Advisory	MRX	Blount, Loudon, Monroe	3 hr
Jul 20, 10:00 AM CDT	Flash Flood Warning	MRX	Morgan, Scott	4 hr
Jul 20, 10:12 AM CDT	Special Weather Statement	MRX	Meigs	33 min
Jul 20, 10:31 AM CDT	Flash Flood Warning	MRX	Bledsoe, Loudon, McMinn, Meigs, Rhea, Roane	4 hr
Jul 20, 10:45 AM CDT	Areal Flood Advisory	MRX	McMinn, Monroe	5 hr
Jul 20, 11:59 AM CDT	Flash Flood Warning	MRX	Sevier	115 min
Jul 20, 12:39 PM CDT	Areal Flood Advisory	MRX	Anderson, Blount, Knox, Loudon, Monroe, Morgan and 2 more	3 hr
Jul 20, 12:45 PM CDT	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Meigs, Rhea	45 min
Jul 20, 1:16 PM CDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, McMinn, Meigs, Polk, Rhea	44 min
Jul 20, 1:19 PM CDT	Areal Flood Advisory	MRX	Bledsoe, Meigs, Rhea	3 hr
Jul 20, 1:51 PM CDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Monroe, Polk	39 min
Jul 20, 2:02 PM CDT	Areal Flood Warning	MRX	Blount, Sevier	3 hr
Jul 20, 2:18 PM CDT	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Marion, Meigs, Rhea, Sequatchie	42 min
Jul 20, 2:55 PM CDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, Marion, Sequatchie	50 min
Jul 20, 3:34 PM CDT	Areal Flood Advisory	MRX	Morgan, Roane, Scott	3 hr
Jul 20, 3:42 PM CDT	Special Weather Statement	MRX	Polk	33 min
Jul 20, 3:44 PM CDT	Areal Flood Advisory	MRX	Bledsoe, Loudon, McMinn, Meigs, Monroe, Rhea and 1 more	3 hr
Jul 20, 11:28 AM CDT	Special Weather Statement	MRX	Cherokee	32 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2023 Every severe thunderstorm warning in 2023

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.