Alert archive / Tennessee / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 110, NWS Morristown, TN

August 22, 20194 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Aug 22, 2019, 7:39 PM EDT for 4 counties in Tennessee. It was in force for 51 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 22, 2019, 7:39 PM EDT (23:39 UTC)
Expired: Aug 22, 2019, 8:30 PM EDT
In force: 51 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Grainger County, TN, Jefferson County, TN, Knox County, TN, Sevier County, TN

The radar

The Knoxville radar (KMRX), 24 km from the middle of the area, began a volume at 23:43 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 12:00Z, 11.7 hours before the alert went out and 333 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: 479 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 1205 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: -13 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 Aug 22, 7:35 PM EDT, 4 minutes earlier.

Area forecast discussion, Aug 22, 7:35 PM EDT, 4 minutes before

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Hazardous weather outlook, Aug 22, 2:49 PM EDT, 4 hours 50 minutes before

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In the hours before

Special weather statement, Aug 22, 5:21 PM EDT, 2 hours 18 minutes before

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Special weather statement, Aug 22, 5:33 PM EDT, 2 hours 6 minutes before

Special Weather Statement
National Weather Service Morristown TN
533 PM EDT Thu Aug 22 2019

TNZ040-041-073-074-222215-
Cocke Smoky Mountains TN-Sevier Smoky Mountains TN-
Northwest Cocke TN-North Sevier TN-
533 PM EDT Thu Aug 22 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN COCKE AND EAST CENTRAL
SEVIER COUNTIES UNTIL 615 PM EDT...

At 533 PM EDT, Doppler radar was tracking a strong thunderstorm 10
miles west of Smoky Mountains-Big Creek, or 11 miles east of
Gatlinburg, moving east at 30 mph.

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

Locations impacted include...
Smoky Mountains-Newfound Gap, Smoky Mountains-Balsam Mountain,
Pittman Center, Del Rio, Round Mountain, Cosby, Hartford, Max Patch,
Waterville and Great Smoky Mountains National Park.

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 3566 8335 3580 8342 3599 8295 3595 8290
      3593 8290 3593 8292 3588 8290 3587 8292
      3584 8292 3582 8295 3579 8296 3577 8299
      3579 8308 3577 8311 3577 8316 3573 8319
      3572 8325 3569 8326 3566 8330
TIME...MOT...LOC 2133Z 249DEG 24KT 3575 8330

DH

Special weather statement, Aug 22, 5:49 PM EDT, 1 hour 50 minutes before

Special Weather Statement
National Weather Service Morristown TN
549 PM EDT Thu Aug 22 2019

VAZ001-002-005-222230-
Scott VA-Wise VA-Lee VA-
549 PM EDT Thu Aug 22 2019

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN LEE...NORTHWESTERN SCOTT
AND SOUTHWESTERN WISE COUNTIES UNTIL 630 PM EDT...

At 549 PM EDT, Doppler radar was tracking a strong thunderstorm near
Jonesville, moving east at 20 mph.

Pea size hail and winds in excess of 45 mph will be possible with
this storm.

Locations impacted include...
Jonesville, Big Stone Gap, Pennington Gap, Appalachia, St. Charles,
Duffield, Jasper, Dryden and Pattonsville.

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 3696 8276 3671 8265 3661 8314 3674 8319
      3675 8313 3678 8313 3680 8310 3682 8310
      3685 8302 3685 8301 3686 8299 3687 8291
      3690 8287 3691 8288 3692 8287
TIME...MOT...LOC 2149Z 250DEG 18KT 3673 8309

DH

Special weather statement, Aug 22, 5:57 PM EDT, 1 hour 42 minutes before

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Special weather statement, Aug 22, 7:04 PM EDT, 35 minutes before

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Special weather statement, Aug 22, 7:19 PM EDT, 20 minutes before

Special Weather Statement
National Weather Service Morristown TN
719 PM EDT Thu Aug 22 2019

TNZ012-222345-
Scott TN-
719 PM EDT Thu Aug 22 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN SCOTT COUNTY UNTIL
745 PM EDT...

At 719 PM EDT, Doppler radar was tracking a strong thunderstorm near
Oneida, moving northeast at 25 mph.

Pea size hail and winds in excess of 45 mph will be possible with
this storm.

Locations impacted include...
Oneida, Helenwood, Winfield, Ketchen, Honey Creek State Park and Big
South Fork National Park.

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 3660 8456 3659 8433 3657 8430 3640 8467
      3641 8467 3644 8469 3650 8471 3658 8477
      3660 8474
TIME...MOT...LOC 2319Z 229DEG 20KT 3656 8458

DH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 8:33 PM EDT	Areal Flood Advisory	MRX	McMinn	117 min
Aug 22, 11:51 AM EDT	Special Weather Statement	MRX	Carter, Sullivan, Washington	39 min
Aug 22, 12:27 PM EDT	Special Weather Statement	MRX	Carter, Johnson, Sullivan	48 min
Aug 22, 1:33 PM EDT	Special Weather Statement	MRX	Knox	42 min
Aug 22, 2:09 PM EDT	Special Weather Statement	MRX	Grainger	51 min
Aug 22, 2:35 PM EDT	Special Weather Statement	MRX	Loudon	40 min
Aug 22, 3:11 PM EDT	Special Weather Statement	MRX	Loudon	49 min
Aug 22, 4:06 PM EDT	Special Weather Statement	MRX	Union	39 min
Aug 22, 5:21 PM EDT	Special Weather Statement	MRX	Anderson	39 min
Aug 22, 5:33 PM EDT	Special Weather Statement	MRX	Cocke	42 min
Aug 22, 5:57 PM EDT	Special Weather Statement	MRX	Loudon, Roane	48 min
Aug 22, 7:04 PM EDT	Special Weather Statement	MRX	Knox	41 min
Aug 22, 7:19 PM EDT	Special Weather Statement	MRX	Scott	26 min
Aug 22, 7:59 PM EDT	Special Weather Statement	MRX	Sevier	46 min
Aug 22, 11:31 AM EDT	Special Weather Statement	MRX	Scott	44 min
Aug 22, 12:07 PM EDT	Special Weather Statement	MRX	Wise, City of Norton	53 min
Aug 22, 1:06 PM EDT	Special Weather Statement	MRX	Russell	39 min
Aug 22, 5:49 PM EDT	Special Weather Statement	MRX	Lee	41 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.