Alert archive / North Carolina / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 8, NWS Morristown, TN

January 3, 2023Polk County, Tennessee; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this severe thunderstorm warning at Jan 3, 2023, 3:32 PM EST for Polk County, Tennessee; Cherokee County, Clay County, North Carolina. It was in force for 43 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: Jan 3, 2023, 3:32 PM EST (20:32 UTC)
Expired: Jan 3, 2023, 4:15 PM EST
In force: 43 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cherokee County, NC, Clay County, NC, Polk County, TN

The radar

The Knoxville radar (KMRX), 135 km from the middle of the area, began a volume at 20:31 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.5 hours before the alert went out and 196 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: 148 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 538 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 304 m²/s²
0-3 km storm-relative helicity: 331 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.7

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 Jan 3, 3:11 PM EST, 21 minutes earlier.

Area forecast discussion, Jan 3, 3:11 PM EST, 21 minutes before

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Hazardous weather outlook, Jan 3, 8:12 AM EST, 7 hours 20 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
812 AM EST Tue Jan 3 2023

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-041315-
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-
812 AM EST Tue Jan 3 2023 /712 AM CST Tue Jan 3 2023/

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

.DAY ONE...Today and Tonight

A strong storm system will affect the area today and Wednesday.
Strong to severe thunderstorms are possible this afternoon, and
again on Wednesday morning. This potential for severe storms is
expected to be mainly in southeast Tennessee and the Cumberland
Plateau. Damaging wind gusts are the main threat, with a low
potential for an isolated tornado. High winds with gusts above 50
mph are likely in and near the mountains today. Also, locally
heavy rainfall and isolated flooding will be possible, mainly
south of Interstate 40.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

No hazardous weather is expected.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and on Wednesday
morning.

In the hours before

Special weather statement, Jan 3, 2:58 PM EST, 34 minutes before

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Local storm report, Jan 3, 3:02 PM EST, 30 minutes before

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Local storm report, Jan 3, 3:05 PM EST, 27 minutes before

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Local storm report, Jan 3, 3:11 PM EST, 21 minutes before

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Special weather statement, Jan 3, 3:14 PM EST, 18 minutes before

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Local storm report, Jan 3, 3:29 PM EST, 3 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
Jan 3, 1:24 PM EST	Special Weather Statement	MRX	Morgan, Scott	51 min
Jan 3, 1:25 PM EST	Special Weather Statement	MRX	Marion	50 min
Jan 3, 1:32 PM EST	Special Weather Statement	MRX	Sequatchie	43 min
Jan 3, 1:53 PM EST	Special Weather Statement	MRX	Bledsoe, Rhea	52 min
Jan 3, 2:07 PM EST	Special Weather Statement	MRX	Anderson, Campbell, Knox, Union	38 min
Jan 3, 2:08 PM EST	Special Weather Statement	MRX	Bradley, Hamilton, McMinn	52 min
Jan 3, 2:17 PM EST	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, Marion, Sequatchie	43 min
Jan 3, 2:21 PM EST	Special Weather Statement	MRX	Loudon, McMinn, Meigs, Roane	24 min
Jan 3, 2:39 PM EST	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, McMinn, Meigs, Monroe, Polk and 1 more	51 min
Jan 3, 2:41 PM EST	Severe Thunderstorm Warning	MRX	Anderson, Blount, Campbell, Grainger, Jefferson, Knox and 3 more	34 min
Jan 3, 2:46 PM EST	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, Polk	44 min
Jan 3, 2:49 PM EST	Special Weather Statement	MRX	Grainger, Hancock, Union	26 min
Jan 3, 2:58 PM EST	Special Weather Statement	MRX	Blount	47 min
Jan 3, 3:04 PM EST	Severe Thunderstorm Warning	MRX	Blount, Knox, Loudon, Monroe, Sevier	41 min
Jan 3, 3:06 PM EST	Severe Thunderstorm Warning	MRX	Blount, Claiborne, Cocke, Grainger, Greene, Hamblen and 5 more	39 min
Jan 3, 3:09 PM EST	Severe Thunderstorm Warning	MRX	Blount, Monroe, Polk	51 min
Jan 3, 3:37 PM EST	Special Weather Statement	MRX	Sevier	38 min
Jan 3, 3:38 PM EST	Special Weather Statement	MRX	Cocke, Greene, Hawkins, Sullivan, Unicoi, Washington	52 min
Jan 3, 4:34 PM EST	Special Weather Statement	MRX	Carter, Unicoi, Washington	26 min
Jan 3, 4:47 PM EST	Special Weather Statement	MRX	Johnson	28 min
Jan 3, 3:14 PM EST	Special Weather Statement	MRX	Lee, Scott, Wise, City of Norton	46 min
Jan 3, 4:06 PM EST	Severe Thunderstorm Warning	MRX	Cherokee, Clay	24 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2023 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.