Alert archive / Tennessee / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 140, NWS Morristown, TN

July 21, 2022Anderson County, Campbell County, Scott County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 21, 2022, 3:34 AM EDT for Anderson County, Campbell County, Scott County, Tennessee. It was in force for 29 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, 2022, 3:34 AM EDT (07:34 UTC)
Expired: Jul 21, 2022, 4:03 AM EDT
In force: 29 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Anderson County, TN, Campbell County, TN, Scott County, TN

The radar

The Knoxville radar (KMRX), 81 km from the middle of the area, began a volume at 07:34 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, 7.6 hours before the alert went out and 209 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: 3262 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1684 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 218 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 Jul 21, 1:50 AM EDT, 1 hour 44 minutes earlier.

Area forecast discussion, Jul 21, 1:50 AM EDT, 1 hour 44 minutes before

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Hazardous weather outlook, Jul 20, 9:46 PM EDT, 5 hours 48 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
946 PM EDT Wed Jul 20 2022

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-220200-
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-
946 PM EDT Wed Jul 20 2022 /846 PM CDT Wed Jul 20 2022/

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

.DAY ONE...Tonight

Scattered showers and thunderstorms will continue tonight and into
the early morning hours. A few of these storms may be strong to
severe, with the primary threats being damaging wind gusts and
very heavy rainfall that could cause localized flooding.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Showers and thunderstorms will be possible Thursday along an
incoming frontal boundary. A few of these storms could be strong
to severe with gusty winds, and heavy rainfall being the main
threats, with the highest risk being in southeast Tennessee and
southwest North Carolina.

Over the weekend and into next week, temperatures in the central
and southern Tennessee valley will climb into the mid and upper
90s, with heat index values exceeding 100.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not needed at this time.

In the hours before

Local storm report, Jul 21, 12:21 AM EDT, 3 hours 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1221 AM EDT THU JUL 21 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1217 AM     FLASH FLOOD      1 N KNOXVILLE           35.99N 83.95W
07/21/2022                   KNOX               TN   LAW ENFORCEMENT

            KNOXVILLE PD REPORTING ROADS NEAR I275 AND
            HEISKELL AVENUE AS UNDER WATER.

&&

19

Local storm report, Jul 21, 12:49 AM EDT, 2 hours 45 minutes before

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Local storm report, Jul 21, 12:53 AM EDT, 2 hours 41 minutes before

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Local storm report, Jul 21, 1:22 AM EDT, 2 hours 12 minutes before

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Local storm report, Jul 21, 1:29 AM EDT, 2 hours 5 minutes before

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Local storm report, Jul 21, 3:17 AM EDT, 17 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, 8:10 PM EDT	Special Weather Statement	MRX	Bradley	50 min
Jul 20, 8:14 PM EDT	Special Weather Statement	MRX	Hamilton	31 min
Jul 20, 9:18 PM EDT	Special Weather Statement	MRX	Knox	27 min
Jul 20, 10:24 PM EDT	Flash Flood Warning	MRX	Anderson, Knox	5 hr
Jul 21, 12:05 AM EDT	Flash Flood Warning	MRX	Anderson, Knox	3 hr
Jul 21, 1:31 AM EDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Hancock, Hawkins	44 min
Jul 21, 1:44 AM EDT	Severe Thunderstorm Warning	MRX	Grainger, Hamblen, Jefferson	30 min
Jul 21, 2:15 AM EDT	Areal Flood Advisory	MRX	Blount, Cocke, Sevier	9 hr
Jul 21, 2:33 AM EDT	Areal Flood Advisory	MRX	Campbell, Claiborne, Union	5 hr
Jul 21, 2:47 AM EDT	Flash Flood Warning	MRX	Anderson, Knox	6 hr
Jul 21, 3:00 AM EDT	Areal Flood Advisory	MRX	Campbell, Scott	5 hr
Jul 21, 3:03 AM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Hamblen, Jefferson, Union	42 min
Jul 21, 4:11 AM EDT	Areal Flood Advisory	MRX	Cocke, Grainger, Greene, Hamblen, Jefferson	3 hr
Jul 21, 4:12 AM EDT	Special Weather Statement	MRX	Anderson, Blount, Cocke, Jefferson, Knox, Loudon and 3 more	48 min
Jul 21, 4:58 AM EDT	Areal Flood Advisory	MRX	Cocke, Jefferson, Sevier	6 hr
Jul 21, 4:58 AM EDT	Special Weather Statement	MRX	Bledsoe, Blount, Knox, Loudon, McMinn, Meigs and 4 more	62 min
Jul 21, 5:40 AM EDT	Special Weather Statement	MRX	Bledsoe, McMinn, Meigs, Monroe, Polk, Sequatchie	65 min
Jul 21, 6:33 AM EDT	Special Weather Statement	MRX	Bradley, Hamilton, Marion, Polk, Sequatchie	57 min
Jul 21, 6:48 AM EDT	Special Weather Statement	MRX	Bledsoe, Meigs, Rhea, Sequatchie	42 min
Jul 21, 6:51 AM EDT	Areal Flood Advisory	MRX	McMinn, Meigs, Rhea	3 hr
Jul 21, 7:27 AM EDT	Special Weather Statement	MRX	Bradley, Hamilton, Sequatchie	48 min
Jul 21, 8:37 AM EDT	Areal Flood Warning	MRX	Anderson, Knox	6 hr
Jul 21, 2:32 AM EDT	Severe Thunderstorm Warning	MRX	Russell, Scott, Washington, Wise, City of Norton	43 min
Jul 21, 3:08 AM EDT	Areal Flood Advisory	MRX	Wise, City of Norton	3 hr
Jul 20, 11:54 PM EDT	Flash Flood Warning	MRX	Cherokee, Clay	5 hr
Jul 21, 4:28 AM EDT	Areal Flood Warning	MRX	Cherokee, Clay	11 hr

Nearby

Severe Thunderstorm Warnings in Tennessee, 2022 Every severe thunderstorm warning in 2022

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.