Alert archive / Tennessee / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 122, NWS Morristown, TN

June 28, 2018Marion County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jun 28, 2018, 11:09 AM CDT for Marion County, Tennessee. It was in force for 36 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
Jun 28, 2018, 11:09 AM CDT (16:09 UTC)
Expired
Jun 28, 2018, 11:45 AM CDT
In force
36 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Marion County, TN

The radar

The Northeast Alabama radar (KHTX), 47 km from the middle of the area, began a volume at 16:12 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, 4.2 hours before the alert went out and 142 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 2018-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2274 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 2018-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 195 square meters per square second.193958Sfc1 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
2274 J/kg
Mixed-layer CIN
-92 J/kg
Mixed-layer LCL
1063 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
195 m²/s²
0-3 km storm-relative helicity
251 m²/s²
Significant tornado parameter
1.4
Supercell composite
11.7

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 Jun 28, 10:55 AM CDT, 14 minutes earlier.

Area forecast discussion, Jun 28, 10:55 AM CDT, 14 minutes before
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Hazardous weather outlook, Jun 28, 2:39 AM CDT, 8 hours 30 minutes before
Hazardous Weather Outlook
National Weather Service Morristown TN
339 AM EDT Thu Jun 28 2018

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-290745-
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-NW 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-Russell-Washington-
339 AM EDT Thu Jun 28 2018 /239 AM CDT Thu Jun 28 2018/

This Hazardous Weather Outlook is for portions of Southwest North
Carolina...East Tennessee and Southwest Virginia.

.DAY ONE...Today and Tonight

Additional showers and thunderstorms are expected once again
across the region. A few of these storms may become strong or
severe, producing damaging winds, hail and heavy rainfall with
localized flash flooding possible.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed today and tonight.

In the hours before

Special weather statement, Jun 28, 9:45 AM CDT, 1 hour 24 minutes before
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Special weather statement, Jun 28, 9:56 AM CDT, 1 hour 13 minutes before
Special Weather Statement
National Weather Service Morristown TN
1056 AM EDT THU JUN 28 2018

NCZ060-TNZ086-087-281600-
Cherokee NC-Northwest Monroe TN-Southeast Monroe TN-
1056 AM EDT THU JUN 28 2018

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN CHEROKEE AND SOUTH
CENTRAL MONROE COUNTIES UNTIL NOON EDT...

At 1056 AM EDT, Doppler radar was tracking a strong thunderstorm 12
miles southeast of Madisonville, moving southeast at 20 mph.

Winds in excess of 45 mph will be possible with this storm.

Locations impacted include...
Murphy, Tellico Plains, Coker Creek, Violet, Hiawasse Dam, Culberson
and Unaka.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3499 8414 3499 8422 3540 8435 3547 8418
      3507 8392 3507 8393 3506 8394 3505 8397
      3504 8396 3498 8414
TIME...MOT...LOC 1456Z 336DEG 17KT 3537 8425

DH
Local storm report, Jun 28, 10:09 AM CDT, 1 hour before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1109 AM EDT THU JUN 28 2018

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

1045 AM     FLASH FLOOD      ATHENS                  35.45N 84.60W
06/28/2018                   MCMINN             TN   BROADCAST MEDIA

            MULTIPLE ROADS FLOODED ACROSS THE COUNTY.

&&

PWARREN
Local storm report, Jun 28, 10:13 AM CDT, 56 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1113 AM EDT THU JUN 28 2018

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

1000 AM     FLASH FLOOD      6 SW GATLINBURG         35.66N 83.57W
06/28/2018                   SEVIER             TN   PARK/FOREST SRVC

            FLOODING IN THE ELKMONT AREA OF THE GSMNP.

&&

PWARREN
Local storm report, Jun 28, 10:54 AM CDT, 15 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1154 AM EDT THU JUN 28 2018

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

1030 AM     TSTM WND DMG     DUNLAP                  35.37N 85.39W
06/28/2018                   SEQUATCHIE         TN   EMERGENCY MNGR

            SEVERAL TREES DOWN ACROSS THE NORTHERN HALF OF THE
            COUNTY.

&&

PWARREN
Local storm report, Jun 28, 10:56 AM CDT, 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1156 AM EDT THU JUN 28 2018

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

1125 AM     TSTM WND DMG     CARTWRIGHT              35.28N 85.46W
06/28/2018                   SEQUATCHIE         TN   EMERGENCY MNGR

            FEW TREES DOWN.

&&

PWARREN

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 27, 7:12 PM CDTFlash Flood WarningMRXMcMinn, Meigs, Rhea2 hr
Jun 27, 7:15 PM CDTSpecial Weather StatementMRXHamilton45 min
Jun 27, 7:24 PM CDTSevere Thunderstorm WarningMRXBradley, Hamilton, McMinn, Meigs51 min
Jun 28, 2:51 AM CDTSpecial Weather StatementMRXBlount39 min
Jun 28, 3:43 AM CDTSpecial Weather StatementMRXKnox47 min
Jun 28, 3:55 AM CDTSpecial Weather StatementMRXMorgan50 min
Jun 28, 4:02 AM CDTAreal Flood AdvisoryMRXMorgan3 hr
Jun 28, 4:30 AM CDTSpecial Weather StatementMRXRhea45 min
Jun 28, 4:39 AM CDTAreal Flood AdvisoryMRXBlount, Knox, Sevier3 hr
Jun 28, 4:43 AM CDTSpecial Weather StatementMRXBlount, Grainger, Jefferson, Sevier47 min
Jun 28, 4:46 AM CDTSevere Thunderstorm WarningMRXAnderson, Morgan, Roane, Scott44 min
Jun 28, 5:15 AM CDTSevere Thunderstorm WarningMRXBlount, Sevier45 min
Jun 28, 5:17 AM CDTSevere Thunderstorm WarningMRXMeigs, Rhea28 min
Jun 28, 5:28 AM CDTFlash Flood WarningMRXMorgan6 hr
Jun 28, 5:33 AM CDTSpecial Weather StatementMRXLoudon, Roane42 min
Jun 28, 5:52 AM CDTAreal Flood AdvisoryMRXBledsoe, Meigs, Rhea3 hr
Jun 28, 5:54 AM CDTSpecial Weather StatementMRXMonroe36 min
Jun 28, 6:05 AM CDTAreal Flood AdvisoryMRXBlount, Sevier3 hr
Jun 28, 6:06 AM CDTAreal Flood AdvisoryMRXLoudon, Roane3 hr
Jun 28, 6:10 AM CDTSpecial Weather StatementMRXBledsoe35 min
Jun 28, 6:48 AM CDTSpecial Weather StatementMRXBledsoe, Meigs, Rhea42 min
Jun 28, 7:06 AM CDTSpecial Weather StatementMRXLoudon, McMinn, Meigs, Monroe, Polk54 min
Jun 28, 7:41 AM CDTFlash Flood WarningMRXLoudon, Roane3 hr
Jun 28, 7:51 AM CDTSevere Thunderstorm WarningMRXMcMinn, Meigs, Monroe, Polk54 min
Jun 28, 8:02 AM CDTSpecial Weather StatementMRXMcMinn, Meigs, Rhea43 min
Jun 28, 8:08 AM CDTAreal Flood AdvisoryMRXMcMinn, Monroe, Polk3 hr
Jun 28, 8:20 AM CDTAreal Flood AdvisoryMRXBledsoe, Meigs, Rhea3 hr
Jun 28, 8:23 AM CDTSpecial Weather StatementMRXBledsoe67 min
Jun 28, 8:33 AM CDTFlash Flood WarningMRXBlount, Sevier117 min
Jun 28, 8:42 AM CDTSevere Thunderstorm WarningMRXBledsoe, Hamilton, Meigs, Rhea63 min
Jun 28, 8:52 AM CDTSpecial Weather StatementMRXPolk53 min
Jun 28, 8:59 AM CDTSevere Thunderstorm WarningMRXBradley, McMinn, Polk61 min
Jun 28, 9:07 AM CDTFlash Flood WarningMRXBledsoe, Rhea113 min
Jun 28, 9:15 AM CDTSevere Thunderstorm WarningMRXBradley, Hamilton, Marion, Sequatchie60 min
Jun 28, 9:27 AM CDTFlash Flood WarningMRXMcMinn, Meigs, Monroe, Polk3 hr
Jun 28, 9:45 AM CDTSpecial Weather StatementMRXBradley15 min
Jun 28, 9:49 AM CDTAreal Flood AdvisoryMRXBradley, Hamilton, Polk, Sequatchie3 hr
Jun 28, 10:14 AM CDTSevere Thunderstorm WarningMRXHamilton, Marion, Sequatchie61 min
Jun 28, 10:59 AM CDTAreal Flood AdvisoryMRXHamilton, Marion, Sequatchie3 hr
Jun 28, 11:57 AM CDTSevere Thunderstorm WarningMRXMarion33 min
Jun 28, 12:39 PM CDTFlash Flood WarningMRXMarion90 min
Jun 28, 6:02 AM CDTSpecial Weather StatementMRXSwain28 min
Jun 28, 9:56 AM CDTSpecial Weather StatementMRXCherokee64 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2018Every severe thunderstorm warning in 2018

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.