Alert archive / Tennessee / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 87, NWS Morristown, TN

June 24, 20184 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jun 24, 2018, 6:16 PM EDT for 4 counties in Tennessee. It was in force for 59 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 24, 2018, 6:16 PM EDT (22:16 UTC)
Expired: Jun 24, 2018, 7:15 PM EDT
In force: 59 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties McMinn County, TN, Meigs County, TN, Monroe County, TN, Rhea County, TN

The radar

The Knoxville radar (KMRX), 122 km from the middle of the area, began a volume at 22:16 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.

What was reported inside it

Time	Report	Where	Remark
Jun 24, 6:40 PM EDT	TSTM WND DMG	Murray Store, TN	SEVERAL TREES DOWN REPORTED ACROSS NORTHERN MCMINN COUNTY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 24 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 10.3 hours before the alert went out and 188 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: 782 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 948 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

363 
WUUS54 KMRX 242216
SVRMRX
TNC107-121-123-143-242315-
/O.NEW.KMRX.SV.W.0087.180624T2216Z-180624T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
616 PM EDT SUN JUN 24 2018

The National Weather Service in Morristown has issued a

* Severe Thunderstorm Warning for...
  East central Rhea County in east Tennessee...
  Northeastern Meigs County in east Tennessee...
  Northeastern McMinn County in east Tennessee...
  Western Monroe County in east Tennessee...

* Until 715 PM EDT.

* At 616 PM EDT, a severe thunderstorm was located near Sweetwater,
  moving southeast at 15 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Athens, Sweetwater, Madisonville, Spring City, Englewood, Vonore,
  Tellico Plains, Niota, Peakland, Clear Water, Murray Store, Ten
  Mile and Mount Vernon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3562 8492 3576 8478 3573 8470 3572 8470
      3572 8468 3570 8467 3572 8465 3571 8462
      3569 8463 3564 8462 3565 8459 3563 8457
      3564 8454 3562 8451 3565 8452 3567 8450
      3565 8449 3566 8447 3556 8418 3531 8435
TIME...MOT...LOC 2216Z 303DEG 11KT 3559 8459 

HAIL...1.00IN
WIND...60MPH
 
$$

DH

1 follow-up statement

494 
WWUS54 KMRX 242256
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
656 PM EDT SUN JUN 24 2018

TNC143-242305-
/O.CAN.KMRX.SV.W.0087.000000T0000Z-180624T2315Z/
Rhea TN-
656 PM EDT SUN JUN 24 2018

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL RHEA COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3559 8475 3569 8463 3564 8462 3565 8459
      3563 8457 3564 8454 3562 8451 3565 8452
      3567 8450 3565 8449 3566 8447 3556 8418
      3531 8435
TIME...MOT...LOC 2255Z 300DEG 22KT 3558 8462 

$$

TNC107-121-123-242315-
/O.CON.KMRX.SV.W.0087.000000T0000Z-180624T2315Z/
Meigs TN-McMinn TN-Monroe TN-
656 PM EDT SUN JUN 24 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR EAST CENTRAL MEIGS...NORTHEASTERN MCMINN AND WESTERN MONROE
COUNTIES...

At 655 PM EDT, a severe thunderstorm was located 8 miles west of
Sweetwater, moving southeast at 25 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Athens, Sweetwater, Madisonville, Englewood, Vonore, Tellico Plains,
Niota, Mount Vernon and Murray Store.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3559 8475 3569 8463 3564 8462 3565 8459
      3563 8457 3564 8454 3562 8451 3565 8452
      3567 8450 3565 8449 3566 8447 3556 8418
      3531 8435
TIME...MOT...LOC 2255Z 300DEG 22KT 3558 8462 

HAIL...0.75IN
WIND...60MPH
 
$$

DH

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 24, 3:08 PM EDT, 3 hours 8 minutes earlier.

Area forecast discussion, Jun 24, 3:08 PM EDT, 3 hours 8 minutes before

Area Forecast Discussion
National Weather Service Morristown TN
308 PM EDT Sun Jun 24 2018

.SHORT TERM...(Tonight and Monday)...After ongoing convection
diminishes later early this evening expect a bit of a lull in the
action, but a mid level short wave is forecast to be moving into
the area late tonight into Monday. This is expected to bring
another round of numerous showers and thunderstorms for the latter
part of the night into Monday. Some of these storms may be strong
to severe with damaging winds the primary threat, so will keep
mention of this in the HWO. With the expected increase in precip
and cloud cover Monday especially north/central, will keep high
temperatures lower than today.

.LONG TERM...(Monday night through Sunday)...Afternoon convection
will linger into at least the first half of the Monday night
period. Should ease from west to east as the evening progresses.
Tuesday the upper ridge remains weak over the forecast area but
should suppress convection over the majority of the Tennessee
Valley while higher terrain and Plateau areas could see scattered
afternoon storms.

The focus shifts to the upper low/trough over the Mississippi River
Valley on Tuesday night. The atmosphere will remain rather moist and
unsettled over our area during this time period. However, by
Wednesday afternoon, the models have been consistent in having the
southern portion of that trough rather active. More widespread
showers and thunderstorms will likely occur on Wednesday into
the first part of Thursday. Expect diminishing rain chances later
Thursday afternoon.

By Friday the upper ridge should suppress the majority of
convection with the exception of along the frontal boundary which
may get hung up across the far southern third of the forecast area.
Under the influence of the upper high, daytime temperatures will be
summer-like in the upper 80s to lower 90s. Overnight temperatures
will generally be in the 70s.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             73  90  72  91 /  30  50  30  20
Knoxville McGhee Tyson Airport, TN  71  86  70  89 /  60  70  40  20
Oak Ridge, TN                       72  86  70  90 /  70  70  40  30
Tri Cities Airport, TN              69  82  66  85 /  60  70  50  30

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...None.
TN...None.
VA...None.
&&

LW/AC

Hazardous weather outlook, Jun 24, 2:59 PM EDT, 3 hours 17 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
259 PM EDT Sun Jun 24 2018

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-251900-
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-
259 PM EDT Sun Jun 24 2018 /159 PM CDT Sun Jun 24 2018/

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

.DAY ONE...This Afternoon and Tonight

Strong to severe storms will be possible late this afternoon into
tonight. Damaging winds will be the main threat with these
storms. Hail up to quarter size and localized flash flooding will
also be possible.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

A few strong to severe storms will also be possible Monday.
Damaging winds will be the main threat with these storms. Hail up
to quarter size will also be possible. Heavy rainfall will also
lead to localized flash flooding especially in areas of poor
drainage.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed at some point today through
Monday.

In the hours before

Special weather statement, Jun 24, 5:29 PM EDT, 47 minutes before

Special Weather Statement
National Weather Service Morristown TN
529 PM EDT SUN JUN 24 2018

TNZ099>101-242215-
West Polk TN-Bradley TN-Hamilton TN-
529 PM EDT SUN JUN 24 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN BRADLEY...SOUTHWESTERN
POLK AND SOUTHEASTERN HAMILTON COUNTIES UNTIL 615 PM EDT...

At 528 PM EDT, Doppler radar was tracking a strong thunderstorm near
Harrison, or 10 miles northeast of Chattanooga, moving east at 25
mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Chattanooga, South Cleveland, Wildwood Lake, Harrison, Collegedale,
Waterville, Conasauga, East Brainerd, Red Clay State Park, Flint
Springs, Gap Springs, Ooltewah, McDonald, Apison, Harrison Bay State
Park and East Ridge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 8519 3515 8512 3508 8462 3499 8465
TIME...MOT...LOC 2128Z 291DEG 21KT 3512 8509

DH

Local storm report, Jun 24, 5:36 PM EDT, 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
536 PM EDT SUN JUN 24 2018

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

0530 PM     TSTM WND DMG     CLEVELAND               35.18N 84.87W
06/24/2018                   BRADLEY            TN   911 CALL CENTER

            SEVERAL TREES DOWN IN THE CLEVELAND AREA.

&&

PWARREN

Special weather statement, Jun 24, 5:48 PM EDT, 28 minutes before

Special Weather Statement
National Weather Service Morristown TN
548 PM EDT SUN JUN 24 2018

TNZ013-014-037-038-242245-
Claiborne TN-Union TN-Campbell TN-Grainger TN-
548 PM EDT SUN JUN 24 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN CLAIBORNE...
SOUTHEASTERN CAMPBELL...WESTERN GRAINGER AND UNION COUNTIES UNTIL 645
PM EDT...

At 548 PM EDT, Doppler radar was tracking a strong thunderstorm near
La Follette, moving east at 25 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
La Follette, Maynardville, Rutledge, Plainview, Blaine, Luttrell,
Lone Mountain, Buffalo Springs, Rose Hill, Big Ridge State Park,
Sharps Chapel, Sandlick, Fincastle, Joppa, Norris Lake and Norris Dam
State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3640 8348 3618 8351 3616 8353 3618 8354
      3619 8356 3617 8356 3617 8358 3615 8359
      3617 8360 3615 8360 3622 8397 3626 8400
      3627 8402 3630 8403 3625 8406 3625 8408
      3624 8407 3625 8415 3642 8412
TIME...MOT...LOC 2148Z 278DEG 25KT 3633 8405

DH

Local storm report, Jun 24, 5:49 PM EDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
549 PM EDT SUN JUN 24 2018

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

0540 PM     TSTM WND DMG     6 S ROCKWOOD            35.79N 84.68W
06/24/2018                   ROANE              TN   911 CALL CENTER

            MULTIPLE TREES DOWN.

&&

PWARREN

Special weather statement, Jun 24, 5:56 PM EDT, 20 minutes before

Special Weather Statement
National Weather Service Morristown TN
556 PM EDT SUN JUN 24 2018

TNZ014>016-038-039-242300-
Claiborne TN-Hamblen TN-Hancock TN-Grainger TN-Hawkins TN-
556 PM EDT SUN JUN 24 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN HAWKINS...
SOUTHEASTERN CLAIBORNE...SOUTHWESTERN HANCOCK...NORTHEASTERN GRAINGER
AND NORTHERN HAMBLEN COUNTIES UNTIL 700 PM EDT...

At 556 PM EDT, Doppler radar was tracking a strong thunderstorm over
Tazewell, or 10 miles north of Rutledge, moving east at 25 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Morristown, Rogersville, Rutledge, New Tazewell, Bean Station,
Tazewell, Russellville, Bulls Gap, Lone Mountain, Howard Quarter,
Thorn Hill, Treadway, Mooresburg, St. Clair and Klondike.

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 3641 8297 3627 8302 3628 8303 3625 8306
      3624 8308 3620 8312 3620 8313 3619 8314
      3618 8316 3635 8367 3652 8361
TIME...MOT...LOC 2156Z 287DEG 21KT 3642 8356

DH

Local storm report, Jun 24, 5:58 PM EDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
558 PM EDT SUN JUN 24 2018

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

0530 PM     FLASH FLOOD      BIG SPRING              35.40N 84.90W
06/24/2018                   MEIGS              TN   911 CALL CENTER

            MULTIPLE ROADS ALONG HWY 58 SOUTH OF DECATUR ARE FLOODED.

&&

PWARREN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 4:22 AM EDT	Special Weather Statement	MRX	Grainger, Hamblen	38 min
Jun 24, 1:44 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Meigs, Rhea	31 min
Jun 24, 2:12 PM EDT	Special Weather Statement	MRX	McMinn, Monroe, Polk	63 min
Jun 24, 3:47 PM EDT	Special Weather Statement	MRX	Jefferson	43 min
Jun 24, 4:08 PM EDT	Special Weather Statement	MRX	Jefferson	67 min
Jun 24, 4:13 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Grainger, Hamblen, Jefferson	47 min
Jun 24, 4:16 PM EDT	Special Weather Statement	MRX	McMinn	44 min
Jun 24, 4:18 PM EDT	Special Weather Statement	MRX	Hamilton	42 min
Jun 24, 4:20 PM EDT	Special Weather Statement	MRX	Knox	55 min
Jun 24, 4:32 PM EDT	Severe Thunderstorm Warning	MRX	McMinn, Meigs	43 min
Jun 24, 4:36 PM EDT	Areal Flood Warning	MRX	Jefferson	3 hr
Jun 24, 4:38 PM EDT	Special Weather Statement	MRX	Marion	52 min
Jun 24, 4:40 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene	65 min
Jun 24, 4:47 PM EDT	Flash Flood Warning	MRX	Hamilton, Meigs, Rhea, Sequatchie	3 hr
Jun 24, 4:47 PM EDT	Special Weather Statement	MRX	Blount	58 min
Jun 24, 4:49 PM EDT	Special Weather Statement	MRX	Hamilton	41 min
Jun 24, 4:59 PM EDT	Severe Thunderstorm Warning	MRX	Hamilton, Marion, Sequatchie	42 min
Jun 24, 5:04 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, McMinn, Meigs, Polk	56 min
Jun 24, 5:07 PM EDT	Special Weather Statement	MRX	Loudon, Roane	53 min
Jun 24, 5:14 PM EDT	Special Weather Statement	MRX	Monroe	46 min
Jun 24, 5:19 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Loudon, McMinn, Meigs, Monroe, Roane	56 min
Jun 24, 5:29 PM EDT	Special Weather Statement	MRX	Bradley	46 min
Jun 24, 5:32 PM EDT	Severe Thunderstorm Warning	MRX	Monroe, Polk	47 min
Jun 24, 5:44 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, Polk	25 min
Jun 24, 5:48 PM EDT	Special Weather Statement	MRX	Grainger, Union	57 min
Jun 24, 5:56 PM EDT	Special Weather Statement	MRX	Hamblen	64 min
Jun 24, 6:00 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Greene, Hamblen, Hancock, Hawkins	60 min
Jun 24, 6:33 PM EDT	Special Weather Statement	MRX	Cocke, Grainger, Jefferson	42 min
Jun 24, 6:53 PM EDT	Special Weather Statement	MRX	Greene	67 min
Jun 24, 7:49 PM EDT	Special Weather Statement	MRX	Sullivan	56 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2018 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.