Alert archive / Tennessee / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 261, NWS Morristown, TN

August 15, 20234 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Aug 15, 2023, 12:35 AM CDT 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
Aug 15, 2023, 12:35 AM CDT (05:35 UTC)
Expired
Aug 15, 2023, 1:15 AM CDT
In force
40 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Hail
0.88 in
Wind
60.0 mph

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

The radar

The Northeast Alabama radar (KHTX), 79 km from the middle of the area, began a volume at 05:33 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.

IssuedProductOfficeLasted
Aug 14, 7:33 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 5.6 hours before the alert went out and 144 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-pSkew-T log-p diagram, Nashville Metro, TN at 00:00Z on 2023-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 636 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 00:00Z on 2023-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
636 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
1097 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.5

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 15, 12:29 AM CDT, 6 minutes earlier.

Area forecast discussion, Aug 15, 12:29 AM CDT, 6 minutes before
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Hazardous weather outlook, Aug 14, 2:12 PM CDT, 10 hours 23 minutes before
Hazardous Weather Outlook
National Weather Service Morristown TN
312 PM EDT Mon Aug 14 2023

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-151915-
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-
312 PM EDT Mon Aug 14 2023 /212 PM CDT Mon Aug 14 2023/

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

.DAY ONE...This Afternoon and Tonight

Widespread thunderstorms are likely this evening with some being
severe. All hazards are possible, including damaging straight
line winds from 60 to 70 mph, large hail from 1 to 1.5 inches, and
an isolated tornado. The tornado threat is greatest along and
north of Interstate 40 with the other threats being more area-
wide.

Additionally, there is an elevated flooding concern this evening
through the overnight hours due to saturated ground, abundant
moisture, and multiple rounds of storms. It is possible for some
places to see off and on rain for more than just a few hours into
the morning hours. Scattered flash flooding is possible, depending
on the coverage and persistence of convection.

Also, hot conditions are expected to continue with many central
and southern Tennessee Valley locations seeing heat indices close
to 100 to 105 degrees, especially in and around Chattanooga. See
the heat advisory for additional details, which is in effect for
Marion, Hamilton, Bradley, and western Polk Counties until 8 PM
EDT.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter reports are welcome this afternoon through tonight for
severe thunderstorms and/or flash flooding.

In the hours before

Local storm report, Aug 14, 11:45 PM CDT, 50 minutes before
Preliminary Local Storm Report
National Weather Service Morristown TN
1245 AM EDT Tue Aug 15 2023

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

1100 PM     Flash Flood      Athens                  35.45N 84.60W
08/14/2023                   McMinn             TN   Law Enforcement

            Several reports of water over roads ranging
            from less than a foot of water to totally
            impassible. Including County Road 197 north
            of Athens and County Road 436 east of
            Athens.

&&

NW
Special weather statement, Aug 14, 11:45 PM CDT, 50 minutes before
Special Weather Statement
National Weather Service Morristown TN
1245 AM EDT Tue Aug 15 2023

NCZ061-150515-
Clay NC-
1245 AM EDT Tue Aug 15 2023

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN CLAY COUNTY THROUGH
115 AM EDT...

At 1245 AM EDT, Doppler radar was tracking a strong thunderstorm near
Nantahala Lake, or 10 miles southeast of Andrews, moving east at 25
mph.

HAZARD...Wind gusts up to 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

A Severe Thunderstorm Watch remains in effect until 300 AM EDT for
southwestern North Carolina.

&&

LAT...LON 3511 8387 3514 8386 3514 8382 3516 8377
      3516 8374 3515 8373 3515 8372 3516 8365
      3515 8364 3514 8366 3514 8364 3512 8364
      3513 8362 3511 8362 3509 8359 3506 8356
TIME...MOT...LOC 0445Z 279DEG 21KT 3513 8366

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

SR
Special weather statement, Aug 14, 11:50 PM CDT, 45 minutes before
Special Weather Statement
National Weather Service Morristown TN
1250 AM EDT Tue Aug 15 2023

NCZ060-061-TNZ087-150530-
Clay NC-Cherokee NC-Southeast Monroe TN-
1250 AM EDT Tue Aug 15 2023

...A STRONG THUNDERSTORM WILL IMPACT CHEROKEE AND CLAY COUNTIES
THROUGH 130 AM EDT...

At 1250 AM EDT, Doppler radar was tracking a strong thunderstorm near
Murphy, moving east at 25 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Andrews, Murphy, Hayesville, Shooting Creek, Tusquitee, Hiawasse Dam,
Marble, Brasstown, and Unaka.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

A Severe Thunderstorm Watch remains in effect until 300 AM EDT for
southwestern North Carolina...and east Tennessee.

&&

LAT...LON 3503 8432 3508 8431 3534 8403 3523 8400
      3522 8396 3526 8384 3525 8373 3517 8374
      3511 8388 3506 8356 3499 8350
TIME...MOT...LOC 0450Z 275DEG 23KT 3519 8406

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
Local storm report, Aug 15, 12:00 AM CDT, 35 minutes before
Preliminary Local Storm Report
National Weather Service Morristown TN
100 AM EDT Tue Aug 15 2023

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

1010 PM     Tstm Wnd Dmg     2 NW Colonial Heights   36.50N 82.54W
08/14/2023                   Sullivan           TN   Law Enforcement

            Trees blown down on Moreland Drive.

&&

NW
Local storm report, Aug 15, 12:09 AM CDT, 26 minutes before
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Special weather statement, Aug 15, 12:20 AM CDT, 15 minutes before
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The office that day

Everything else NWS Morristown, TN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 14, 7:00 PM CDTSevere Thunderstorm WarningMRXAnderson, Knox, Union45 min
Aug 14, 7:18 PM CDTSevere Thunderstorm WarningMRXBradley, Hamilton, McMinn, Meigs, Rhea42 min
Aug 14, 7:31 PM CDTSevere Thunderstorm WarningMRXGrainger, Jefferson, Knox, Sevier, Union44 min
Aug 14, 7:45 PM CDTSevere Thunderstorm WarningMRXBlount, Knox, Loudon60 min
Aug 14, 7:56 PM CDTSevere Thunderstorm WarningMRXClaiborne, Hancock, Hawkins49 min
Aug 14, 7:58 PM CDTSevere Thunderstorm WarningMRXCocke, Greene, Hamblen, Jefferson47 min
Aug 14, 7:59 PM CDTSevere Thunderstorm WarningMRXBradley, McMinn, Meigs, Monroe, Polk46 min
Aug 14, 8:03 PM CDTSevere Thunderstorm WarningMRXGrainger, Hamblen, Jefferson42 min
Aug 14, 8:12 PM CDTSevere Thunderstorm WarningMRXClaiborne, Hancock25 min
Aug 14, 8:21 PM CDTAreal Flood AdvisoryMRXAnderson, Grainger, Jefferson, Knox, Union11 min
Aug 14, 8:27 PM CDTSevere Thunderstorm WarningMRXHawkins, Sullivan48 min
Aug 14, 8:32 PM CDTFlash Flood WarningMRXAnderson, Grainger, Jefferson, Knox, Union3 hr
Aug 14, 8:34 PM CDTSevere Thunderstorm WarningMRXGreene, Hancock, Hawkins41 min
Aug 14, 8:38 PM CDTTornado WarningMRXHawkins52 min
Aug 14, 8:42 PM CDTSevere Thunderstorm WarningMRXGrainger, Hamblen, Hawkins, Jefferson29 min
Aug 14, 8:44 PM CDTSevere Thunderstorm WarningMRXMcMinn, Monroe, Polk46 min
Aug 14, 8:45 PM CDTSevere Thunderstorm WarningMRXGreene, Hawkins, Sullivan, Washington45 min
Aug 14, 8:50 PM CDTTornado WarningMRXGreene, Hawkins, Sullivan, Washington40 min
Aug 14, 9:09 PM CDTTornado WarningMRXCarter, Sullivan, Washington51 min
Aug 14, 9:10 PM CDTFlash Flood WarningMRXHancock, Hawkins4 hr
Aug 14, 9:32 PM CDTSevere Thunderstorm WarningMRXMcMinn, Monroe43 min
Aug 14, 9:38 PM CDTFlash Flood WarningMRXMcMinn, Meigs, Polk5 hr
Aug 14, 9:42 PM CDTTornado WarningMRXCarter, Johnson, Sullivan63 min
Aug 14, 9:46 PM CDTSevere Thunderstorm WarningMRXAnderson, Knox, Morgan, Roane44 min
Aug 14, 9:53 PM CDTSpecial Weather StatementMRXMonroe52 min
Aug 14, 10:17 PM CDTFlash Flood WarningMRXMcMinn, Monroe6 hr
Aug 14, 10:23 PM CDTSevere Thunderstorm WarningMRXCocke, Grainger, Greene, Hamblen, Hawkins, Jefferson52 min
Aug 14, 10:35 PM CDTSpecial Weather StatementMRXMcMinn, Monroe40 min
Aug 14, 10:54 PM CDTFlash Flood WarningMRXMonroe5 hr
Aug 14, 10:56 PM CDTSevere Thunderstorm WarningMRXCarter, Cocke, Greene, Hawkins, Johnson, Unicoi and 1 more64 min
Aug 14, 11:12 PM CDTFlash Flood WarningMRXCocke, Greene, Hamblen, Jefferson5 hr
Aug 14, 11:16 PM CDTSpecial Weather StatementMRXMonroe29 min
Aug 14, 11:52 PM CDTTornado WarningMRXCarter, Johnson16 min
Aug 15, 12:17 AM CDTFlash Flood WarningMRXMonroe4 hr
Aug 15, 12:20 AM CDTSpecial Weather StatementMRXBledsoe, Rhea, Sequatchie40 min
Aug 15, 12:50 AM CDTSevere Thunderstorm WarningMRXHamilton, Marion25 min
Aug 15, 12:58 AM CDTSpecial Weather StatementMRXLoudon, Meigs47 min
Aug 15, 1:38 AM CDTSpecial Weather StatementMRXPolk52 min
Aug 15, 1:56 AM CDTSpecial Weather StatementMRXMonroe34 min
Aug 15, 2:16 AM CDTAreal Flood AdvisoryMRXCarter, Cocke, Greene, Hamblen, Hawkins, Jefferson and 3 more7 hr
Aug 15, 2:21 AM CDTFlash Flood WarningMRXBlount, Monroe98 min
Aug 15, 2:25 AM CDTAreal Flood AdvisoryMRXBlount, Cocke, Knox, Loudon, McMinn, Monroe and 1 more7 hr
Aug 15, 2:39 AM CDTAreal Flood AdvisoryMRXMcMinn, Meigs, Polk4 hr
Aug 15, 3:57 AM CDTAreal Flood WarningMRXCocke, Greene, Hamblen, Jefferson2 hr
Aug 15, 3:59 AM CDTAreal Flood WarningMRXBlount, Monroe6 hr
Aug 15, 4:04 AM CDTAreal Flood AdvisoryMRXMonroe116 min
Aug 15, 4:07 AM CDTAreal Flood WarningMRXMcMinn, Monroe6 hr
Aug 15, 4:09 AM CDTAreal Flood WarningMRXMonroe6 hr
Aug 14, 10:55 PM CDTSpecial Weather StatementMRXCherokee35 min
Aug 14, 11:45 PM CDTSpecial Weather StatementMRXClay30 min
Aug 14, 11:50 PM CDTSpecial Weather StatementMRXCherokee, Clay40 min
Aug 15, 2:31 AM CDTSpecial Weather StatementMRXCherokee, Clay44 min
Aug 15, 3:11 AM CDTFlash Flood WarningMRXCherokee, Clay81 min
Aug 15, 3:11 AM CDTSpecial Weather StatementMRXClay19 min
Aug 15, 4:32 AM CDTAreal Flood AdvisoryMRXCherokee, Clay103 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2023Every 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.