Alert archive / Tennessee / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 98, NWS Morristown, TN

August 1, 2019Johnson County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Aug 1, 2019, 9:34 PM EDT for Johnson County, Tennessee. It was in force for 41 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 1, 2019, 9:34 PM EDT (01:34 UTC)
Expired: Aug 1, 2019, 10:15 PM EDT
In force: 41 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Johnson County, TN

The radar

The Knoxville radar (KMRX), 142 km from the middle of the area, began a volume at 01:35 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 1.6 hours before the alert went out and 180 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: 1524 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1332 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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 Aug 1, 9:20 PM EDT, 14 minutes earlier.

Area forecast discussion, Aug 1, 9:20 PM EDT, 14 minutes before

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Hazardous weather outlook, Aug 1, 3:06 PM EDT, 6 hours 28 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
306 PM EDT Thu Aug 1 2019

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-021915-
Cherokee-Clay-Scott-Campbell-Claiborne-Hancock-Hawkins-Sullivan-
Johnson-Morgan-Anderson-Union-Grainger-Hamblen-Northwest Cocke-
Cocke Smoky Mountains-Northwest Greene-Southeast Greene-
Washington-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-Russell-
306 PM EDT Thu Aug 1 2019 /206 PM CDT Thu Aug 1 2019/

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

.DAY ONE...Today and Tonight

Scattered showers and thunderstorms can be expected, especially
this afternoon into early evening. A few of these thunderstorms
may become strong to severe, with locally damaging winds along
with torrential downpours which may cause localized flooding.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Numerous showers and thunderstorms on Sunday may have the
potential to produce heavy rainfall and localized flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated, but spotters are encouraged
to submit any reports of severe weather through the web by going
to www.weather.gov/mrx/SpotterReports.

In the hours before

Special weather statement, Aug 1, 7:22 PM EDT, 2 hours 12 minutes before

Special Weather Statement
National Weather Service Morristown TN
722 PM EDT Thu Aug 1 2019

NCZ060-TNZ087-101-102-020015-
Cherokee NC-West Polk TN-East Polk TN-Southeast Monroe TN-
722 PM EDT Thu Aug 1 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CHEROKEE...
NORTHEASTERN POLK AND SOUTH CENTRAL MONROE COUNTIES UNTIL 815 PM
EDT...

At 722 PM EDT, Doppler radar was tracking a strong thunderstorm 14
miles northeast of Ducktown, moving west at 20 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Hiawasse Dam, Coker Creek, Violet, Turtletown 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 3524 8454 3527 8444 3524 8437 3531 8429
      3534 8420 3517 8408 3506 8450
TIME...MOT...LOC 2322Z 073DEG 16KT 3523 8426

DH

Special weather statement, Aug 1, 7:36 PM EDT, 1 hour 58 minutes before

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Special weather statement, Aug 1, 7:42 PM EDT, 1 hour 52 minutes before

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Local storm report, Aug 1, 7:45 PM EDT, 1 hour 49 minutes before

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Special weather statement, Aug 1, 8:29 PM EDT, 1 hour 5 minutes before

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Special weather statement, Aug 1, 9:18 PM EDT, 16 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
Aug 1, 8:22 PM EDT	Areal Flood Advisory	MRX	Sullivan, Washington	113 min
Aug 1, 8:29 PM EDT	Special Weather Statement	MRX	Sullivan	46 min
Aug 1, 9:18 PM EDT	Special Weather Statement	MRX	Johnson, Sullivan	42 min
Aug 1, 9:25 PM EDT	Areal Flood Advisory	MRX	Johnson, Sullivan	2 hr
Aug 1, 10:22 PM EDT	Special Weather Statement	MRX	Johnson	38 min
Aug 2, 1:42 PM EDT	Special Weather Statement	MRX	Campbell	48 min
Aug 2, 2:54 PM EDT	Special Weather Statement	MRX	Blount	51 min
Aug 2, 3:11 PM EDT	Areal Flood Advisory	MRX	Johnson	2 hr
Aug 2, 3:23 PM EDT	Special Weather Statement	MRX	Jefferson	52 min
Aug 2, 3:40 PM EDT	Areal Flood Advisory	MRX	Blount	99 min
Aug 2, 4:07 PM EDT	Special Weather Statement	MRX	Claiborne	38 min
Aug 2, 4:21 PM EDT	Areal Flood Advisory	MRX	Claiborne, Hancock	58 min
Aug 2, 4:27 PM EDT	Areal Flood Advisory	MRX	Sullivan	2 hr
Aug 2, 4:42 PM EDT	Special Weather Statement	MRX	Hamblen	48 min
Aug 2, 4:48 PM EDT	Special Weather Statement	MRX	Claiborne	42 min
Aug 2, 4:56 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Union	20 min
Aug 2, 5:13 PM EDT	Areal Flood Advisory	MRX	Grainger, Greene, Hamblen, Hawkins	2 hr
Aug 2, 5:34 PM EDT	Areal Flood Advisory	MRX	Scott	116 min
Aug 2, 5:54 PM EDT	Special Weather Statement	MRX	Scott	36 min
Aug 2, 6:05 PM EDT	Special Weather Statement	MRX	Greene	40 min
Aug 2, 6:12 PM EDT	Severe Thunderstorm Warning	MRX	Scott	33 min
Aug 2, 6:20 PM EDT	Areal Flood Advisory	MRX	Scott	3 hr
Aug 2, 6:29 PM EDT	Flash Flood Warning	MRX	Scott	2 hr
Aug 2, 6:38 PM EDT	Special Weather Statement	MRX	Scott	37 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2019 Every severe thunderstorm warning in 2019

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.