Alert archive / Tennessee / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 172, NWS Morristown, TN

July 29, 20235 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 29, 2023, 3:05 PM EDT for 5 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 29, 2023, 3:05 PM EDT (19:05 UTC)
Expired
Jul 29, 2023, 3:45 PM EDT
In force
40 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Anderson County, TN, Campbell County, TN, Grainger County, TN, Knox County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 47 km from the middle of the area, began a volume at 19:08 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, 7.1 hours before the alert went out and 240 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 12:00Z on 2023-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1630 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 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 12:00Z on 2023-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 96 square meters per square second.1939Sfc1 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
1630 J/kg
Mixed-layer CIN
-138 J/kg
Mixed-layer LCL
1241 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
96 m²/s²
0-3 km storm-relative helicity
129 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 29, 1:58 PM EDT, 1 hour 7 minutes earlier.

Area forecast discussion, Jul 29, 1:58 PM EDT, 1 hour 7 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Hazardous weather outlook, Jul 29, 3:22 AM EDT, 11 hours 43 minutes before
Hazardous Weather Outlook
National Weather Service Morristown TN
322 AM EDT Sat Jul 29 2023

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-300730-
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-
322 AM EDT Sat Jul 29 2023 /222 AM CDT Sat Jul 29 2023/

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

.DAY ONE...Today and Tonight

Very hot conditions will continue today with temperatures far
into the 90s and heat index values around 100 degrees across the
central and southern Tennessee Valley.

A few strong storms are possible during the afternoon and evening hours
with isolated damaging winds and heavy rainfall as the main
threats.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not needed at this time.

In the hours before

Special weather statement, Jul 29, 10:20 AM EDT, 4 hours 45 minutes before
Special Weather Statement
National Weather Service Morristown TN
1020 AM EDT Sat Jul 29 2023

VAZ006-291500-
Russell VA-
1020 AM EDT Sat Jul 29 2023

...A strong thunderstorm will impact portions of Russell County
through 1100 AM EDT...

At 1019 AM EDT, Doppler radar was tracking a strong thunderstorm over
Trammel, or 8 miles southwest of Davenport, moving east at 25 mph.

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Lebanon, Cleveland Va, Honaker, Dye and Rosedale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3708 8186 3704 8182 3696 8178 3695 8182
      3689 8189 3687 8196 3688 8198 3687 8202
      3693 8231 3697 8233 3700 8229 3699 8225
      3704 8217 3705 8210 3704 8208 3705 8204
      3709 8201
TIME...MOT...LOC 1419Z 281DEG 23KT 3702 8226

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

TD
Special weather statement, Jul 29, 10:53 AM EDT, 4 hours 12 minutes before
Special Weather Statement
National Weather Service Morristown TN
1053 AM EDT Sat Jul 29 2023

VAZ006-008-291545-
Washington VA-Russell VA-
1053 AM EDT Sat Jul 29 2023

...A strong thunderstorm will impact portions of central Russell and
central Washington Counties through 1145 AM EDT...

At 1052 AM EDT, Doppler radar was tracking a strong thunderstorm over
Lebanon, moving southeast at 25 mph.

HAZARD...Winds up to 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Abingdon, Lebanon, Glade Spring, Damascus, Lindell, Holston,
Hansonville, Emory-Meadow View and Rosedale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3661 8183 3662 8187 3682 8223 3701 8201
      3694 8182 3693 8184 3680 8171 3676 8168
TIME...MOT...LOC 1452Z 298DEG 21KT 3686 8208

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

TD
Special weather statement, Jul 29, 2:37 PM EDT, 28 minutes before
Special Weather Statement
National Weather Service Morristown TN
237 PM EDT Sat Jul 29 2023

TNZ035-067-291930-
Roane TN-Morgan TN-
237 PM EDT Sat Jul 29 2023

...A strong thunderstorm will impact portions of southeastern Morgan
and northern Roane Counties through 330 PM EDT...

At 236 PM EDT, Doppler radar was tracking a strong thunderstorm near
Rockwood, moving east at 25 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Oak Ridge, Kingston, Rockwood, Oliver Springs, Midtown, Harriman,
Oakdale, Coalfield, Bradbury and Pine Orchard.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3587 8472 3589 8471 3590 8468 3598 8471
      3601 8474 3606 8473 3603 8433 3589 8432
      3589 8433 3584 8434 3582 8438 3580 8438
TIME...MOT...LOC 1836Z 281DEG 20KT 3596 8466

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...30 MPH

TD
Special weather statement, Jul 29, 2:46 PM EDT, 19 minutes before
Special Weather Statement
National Weather Service Morristown TN
246 PM EDT Sat Jul 29 2023

TNZ013-036-037-291930-
Anderson TN-Union TN-Campbell TN-
246 PM EDT Sat Jul 29 2023

...A strong thunderstorm will impact portions of northeastern
Anderson, southeastern Campbell and western Union Counties through
330 PM EDT...

At 246 PM EDT, Doppler radar was tracking a strong thunderstorm near
Jacksboro, or near La Follette, moving east at 20 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
La Follette, Jacksboro, Caryville, Rocky Top, Norris, Norris Dam
State Park, Andersonville, Paulette, Big Ridge State Park and Sharps
Chapel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3637 8379 3617 8387 3617 8390 3616 8391
      3617 8391 3617 8392 3619 8395 3616 8399
      3620 8427 3640 8421
TIME...MOT...LOC 1846Z 281DEG 18KT 3631 8415

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

TD

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 8:24 PM EDTSevere Thunderstorm WarningMRXHawkins, Sullivan, Washington66 min
Jul 29, 2:37 PM EDTSpecial Weather StatementMRXRoane53 min
Jul 29, 2:46 PM EDTSpecial Weather StatementMRXUnion44 min
Jul 29, 2:53 PM EDTSevere Thunderstorm WarningMRXLoudon, Morgan, Roane52 min
Jul 29, 3:35 PM EDTSevere Thunderstorm WarningMRXLoudon, McMinn, Meigs, Monroe, Roane55 min
Jul 29, 3:41 PM EDTSevere Thunderstorm WarningMRXGrainger, Jefferson, Knox, Sevier, Union29 min
Jul 29, 4:02 PM EDTSevere Thunderstorm WarningMRXBlount, Loudon, Monroe58 min
Jul 29, 4:05 PM EDTSpecial Weather StatementMRXMcMinn40 min
Jul 29, 4:08 PM EDTSpecial Weather StatementMRXAnderson, Knox52 min
Jul 29, 4:14 PM EDTSevere Thunderstorm WarningMRXClaiborne, Grainger, Hamblen, Hancock, Hawkins61 min
Jul 29, 4:16 PM EDTSpecial Weather StatementMRXJefferson44 min
Jul 29, 4:25 PM EDTSpecial Weather StatementMRXBlount50 min
Jul 29, 4:38 PM EDTSevere Thunderstorm WarningMRXGrainger, Jefferson, Knox, Sevier13 min
Jul 29, 4:44 PM EDTSpecial Weather StatementMRXCocke46 min
Jul 29, 4:48 PM EDTSevere Thunderstorm WarningMRXCocke, Greene, Hamblen, Hawkins57 min
Jul 29, 4:53 PM EDTSevere Thunderstorm WarningMRXCarter, Greene, Hancock, Hawkins, Johnson, Sullivan and 1 more67 min
Jul 29, 4:59 PM EDTSpecial Weather StatementMRXSevier61 min
Jul 29, 5:08 PM EDTSevere Thunderstorm WarningMRXCocke, Greene, Sevier52 min
Jul 29, 5:10 PM EDTSevere Thunderstorm WarningMRXCarter, Greene, Unicoi, Washington51 min
Jul 29, 5:23 PM EDTSevere Thunderstorm WarningMRXCocke, Sevier52 min
Jul 29, 5:33 PM EDTSevere Thunderstorm WarningMRXCarter, Johnson, Sullivan, Unicoi42 min
Jul 29, 5:49 PM EDTSpecial Weather StatementMRXClaiborne, Grainger, Union41 min
Jul 29, 5:54 PM EDTSpecial Weather StatementMRXCampbell, Morgan, Scott51 min
Jul 29, 6:01 PM EDTSevere Thunderstorm WarningMRXAnderson, Campbell, Claiborne, Union59 min
Jul 29, 6:13 PM EDTSevere Thunderstorm WarningMRXClaiborne, Grainger, Hamblen, Jefferson, Union20 min
Jul 29, 6:38 PM EDTSevere Thunderstorm WarningMRXAnderson, Campbell, Scott, Union38 min
Jul 29, 6:42 PM EDTSpecial Weather StatementMRXAnderson, Roane48 min
Jul 29, 7:06 PM EDTSevere Thunderstorm WarningMRXAnderson, Blount, Grainger, Jefferson, Knox, Loudon and 3 more54 min
Jul 29, 7:13 PM EDTSpecial Weather StatementMRXLoudon, McMinn, Monroe47 min
Jul 29, 7:15 PM EDTSpecial Weather StatementMRXBledsoe, Meigs, Rhea, Sequatchie45 min
Jul 29, 7:35 PM EDTSpecial Weather StatementMRXPolk40 min
Jul 29, 7:46 PM EDTSpecial Weather StatementMRXBlount44 min
Jul 29, 7:53 PM EDTSpecial Weather StatementMRXHamilton, Sequatchie52 min
Jul 28, 8:19 PM EDTSpecial Weather StatementMRXScott41 min
Jul 29, 10:20 AM EDTSpecial Weather StatementMRXRussell40 min
Jul 29, 10:53 AM EDTSpecial Weather StatementMRXRussell, Washington52 min
Jul 29, 4:06 PM EDTSevere Thunderstorm WarningMRXLee, Russell, Scott, Washington, Wise, City of Bristol and 1 more54 min
Jul 29, 4:28 PM EDTAreal Flood AdvisoryMRXRussell3 hr

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.