Alert archive / Tennessee / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 89, NWS Morristown, TN

June 25, 2018Loudon County, Roane County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jun 25, 2018, 12:31 PM EDT for Loudon County, Roane County, Tennessee. It was in force for 44 min. 2 reports 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 25, 2018, 12:31 PM EDT (16:31 UTC)
Expired: Jun 25, 2018, 1:15 PM EDT
In force: 44 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Loudon County, TN, Roane County, TN

The radar

The Knoxville radar (KMRX), 114 km from the middle of the area, began a volume at 16:31 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 25, 1:15 PM EDT	HAIL 1	Loudon, TN
Jun 25, 1:25 PM EDT	TSTM WND DMG	5 Ne Philadelphia, TN	TWO TREES WERE REPORTED DOWN FIVE MILES NORTHEAST OF PHILADELPHIA.

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 44 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, 4.5 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: 1637 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 801 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 4.8

Open this sounding in Storm Lab

The text

As transmitted.

643 
WUUS54 KMRX 251631
SVRMRX
TNC105-145-251715-
/O.NEW.KMRX.SV.W.0089.180625T1631Z-180625T1715Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
1231 PM EDT MON JUN 25 2018

The National Weather Service in Morristown has issued a

* Severe Thunderstorm Warning for...
  Central Loudon County in east Tennessee...
  Roane County in east Tennessee...

* Until 115 PM EDT.

* At 1231 PM EDT, a severe thunderstorm was located near Fairview, or
  7 miles west of Loudon, moving east at 20 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...
  Oak Ridge, Lenoir City, Kingston, Rockwood, Loudon, Fairview,
  Midtown, Harriman, Philadelphia, Paint Rock, Bradbury and Tellico
  Village.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

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

&&

LAT...LON 3571 8462 3573 8464 3570 8467 3572 8468
      3572 8470 3574 8470 3584 8475 3601 8439
      3572 8417 3569 8416 3568 8463
TIME...MOT...LOC 1631Z 263DEG 21KT 3576 8448 

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

mjb

1 follow-up statement

141 
WWUS54 KMRX 251659
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
1259 PM EDT MON JUN 25 2018

TNC105-145-251715-
/O.CON.KMRX.SV.W.0089.000000T0000Z-180625T1715Z/
Loudon TN-Roane TN-
1259 PM EDT MON JUN 25 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 PM EDT
FOR CENTRAL LOUDON AND ROANE COUNTIES...

At 1259 PM EDT, a severe thunderstorm was located near Loudon, moving
east at 20 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...
Oak Ridge, Lenoir City, Kingston, Rockwood, Loudon, Fairview,
Midtown, Harriman, Philadelphia, Paint Rock, Bradbury and Tellico
Village.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

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

&&

LAT...LON 3571 8462 3573 8464 3570 8467 3572 8468
      3572 8470 3574 8470 3584 8475 3601 8439
      3572 8417 3569 8416 3568 8463
TIME...MOT...LOC 1659Z 269DEG 20KT 3574 8429 

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

mjb

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 25, 10:50 AM EDT, 1 hour 41 minutes earlier.

Area forecast discussion, Jun 25, 10:50 AM EDT, 1 hour 41 minutes before

Area Forecast Discussion
National Weather Service Morristown TN
1050 AM EDT Mon Jun 25 2018

.DISCUSSION...The overall weather pattern shows weak ridging over
the Southern Appalachian Region today with a minor short wave riding
along the upper flow...and at the surface...a broad frontal boundary
stretched west to east across KY. This set up will allow a band of
showers and thunderstorms to develop and move through the area this
afternoon.  The air mass will destabilize this afternoon with CAPE
values expected to be around 1500-2500 J/Kg and bulk shear 0-6 km
around 25-35 kts.  As a result...a few storms may become strong to
severe with the greatest threat strong...damaging winds and to a
lesser extent large hail up to an inch will be possible.
Additionally...heavy rain is possible with the stronger storms which
may cause minor flooding...mainly in low lying areas or poor
drainage locations.  All handled well in the current forecast...will
update to remove morning wording.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             91  72  91  73 /  50  20  30  20
Knoxville McGhee Tyson Airport, TN  87  71  88  71 /  70  40  30  40
Oak Ridge, TN                       86  71  88  72 /  60  30  30  40
Tri Cities Airport, TN              83  67  83  67 /  70  50  30  40

&&

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

mjb

Hazardous weather outlook, Jun 25, 4:20 AM EDT, 8 hours 11 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
420 AM EDT Mon Jun 25 2018

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-260830-
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-
420 AM EDT Mon Jun 25 2018 /320 AM CDT Mon Jun 25 2018/

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

.DAY ONE...Today and Tonight

Strong to severe storms will be possible this afternoon. 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...Tuesday through Sunday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon.

In the hours before

Special weather statement, Jun 25, 6:48 AM EDT, 5 hours 43 minutes before

Special Weather Statement
National Weather Service Morristown TN
648 AM EDT MON JUN 25 2018

VAZ002-251115-
Wise VA-
648 AM EDT MON JUN 25 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN WISE COUNTY UNTIL
715 AM EDT...

At 648 AM EDT, Doppler radar was tracking a strong thunderstorm over
Mayking, or near Whitesburg, moving east at 40 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Pound.

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 3713 8255 3705 8249 3702 8277 3703 8276
      3703 8275 3704 8274 3705 8272 3707 8273
      3708 8272 3712 8272 3715 8264 3720 8255
TIME...MOT...LOC 1048Z 256DEG 44KT 3712 8275

05/MA

Special weather statement, Jun 25, 11:13 AM EDT, 1 hour 18 minutes before

Special Weather Statement
National Weather Service Morristown TN
1113 AM EDT MON JUN 25 2018

TNZ012-013-035-036-251600-
Anderson TN-Scott TN-Campbell TN-Morgan TN-
1113 AM EDT MON JUN 25 2018

...SIGNIFICANT WEATHER ADVISORY FOR MORGAN...NORTHERN ANDERSON...
SOUTHWESTERN CAMPBELL AND SOUTHEASTERN SCOTT COUNTIES UNTIL NOON
EDT...

At 1113 AM EDT, Doppler radar was tracking a strong thunderstorm near
Wartburg, moving northeast at 45 mph.

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

Locations impacted include...
Clinton, Wartburg, Jacksboro, Huntsville, Caryville, Lake City,
Norris, Sunbright, Norris Dam State Park, High Point, Smokey
Junction, Rosedale, Disney, Cove Lake State Park, Deerlodge, Royal
Blue, Norma, Frozen Head State Park, Slick Rock and Petros.

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.

&&

LAT...LON 3647 8434 3618 8404 3596 8471 3599 8472
      3606 8479 3609 8480 3609 8482 3614 8486
TIME...MOT...LOC 1513Z 245DEG 40KT 3617 8455

mjb

Special weather statement, Jun 25, 11:16 AM EDT, 1 hour 15 minutes before

Special Weather Statement
National Weather Service Morristown TN
1116 AM EDT MON JUN 25 2018

TNZ082-083-251600-
Rhea TN-Bledsoe TN-
1116 AM EDT MON JUN 25 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN RHEA AND
NORTHEASTERN BLEDSOE COUNTIES UNTIL NOON EDT/1100 AM CDT/...

At 1115 AM EDT/1015 AM CDT/, Doppler radar was tracking a strong
thunderstorm 10 miles west of Spring City, or 12 miles northeast of
Pikeville, moving east at 30 mph.

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

Locations impacted include...
Spring City, Grandview, Piney Falls State Park, Melvine, Mount Crest
and Stinging Fork Falls State 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.

&&

LAT...LON 3575 8526 3576 8527 3577 8525 3577 8510
      3576 8507 3577 8504 3575 8503 3577 8494
      3576 8492 3578 8490 3578 8488 3582 8481
      3572 8472 3563 8523 3575 8527
TIME...MOT...LOC 1515Z 250DEG 25KT 3573 8503

mjb

Special weather statement, Jun 25, 11:35 AM EDT, 56 minutes before

Special Weather Statement
National Weather Service Morristown TN
1135 AM EDT MON JUN 25 2018

TNZ012-013-251615-
Scott TN-Campbell TN-
1135 AM EDT MON JUN 25 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CAMPBELL AND SCOTT
COUNTIES UNTIL 1215 PM EDT...

At 1134 AM EDT, Doppler radar was tracking a strong thunderstorm over
Oneida, moving east at 30 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
La Follette, Oneida, Huntsville, Helenwood, Jellico, Caryville,
Winfield, Elk Valley, Honey Creek State Park, Big South Fork National
Park, Ketchen, Royal Blue, Robbins and Rugby State 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.

&&

LAT...LON 3659 8419 3637 8410 3635 8469 3637 8470
      3639 8469 3640 8466 3641 8467 3641 8466
      3644 8469 3650 8471 3660 8478
TIME...MOT...LOC 1534Z 259DEG 26KT 3650 8448

mjb

Special weather statement, Jun 25, 12:20 PM EDT, 11 minutes before

Special Weather Statement
National Weather Service Morristown TN
1220 PM EDT MON JUN 25 2018

TNZ067-068-084-251700-
Roane TN-Loudon TN-Meigs TN-
1220 PM EDT MON JUN 25 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL LOUDON...NORTHEASTERN
MEIGS AND ROANE COUNTIES UNTIL 100 PM EDT...

At 1220 PM EDT, Doppler radar was tracking a strong thunderstorm over
Fairview, or 8 miles southwest of Kingston, moving east at 20 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Oak Ridge, Kingston, Rockwood, Loudon, Fairview, Midtown, Harriman,
Philadelphia, Paint Rock, Bradbury, Eagle Furnace and Dearmond.

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.

&&

LAT...LON 3568 8470 3571 8472 3573 8471 3575 8472
      3575 8475 3576 8476 3579 8474 3582 8479
      3586 8473 3589 8471 3599 8448 3598 8446
      3600 8442 3569 8429
TIME...MOT...LOC 1620Z 258DEG 18KT 3576 8458

mjb

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 25, 2:31 AM EDT	Special Weather Statement	MRX	Knox	44 min
Jun 25, 3:06 AM EDT	Special Weather Statement	MRX	Union	39 min
Jun 25, 3:35 AM EDT	Special Weather Statement	MRX	Jefferson	25 min
Jun 25, 4:00 AM EDT	Special Weather Statement	MRX	Hamblen, Jefferson	30 min
Jun 25, 11:13 AM EDT	Special Weather Statement	MRX	Morgan	47 min
Jun 25, 11:16 AM EDT	Special Weather Statement	MRX	Rhea	44 min
Jun 25, 11:27 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Rhea	48 min
Jun 25, 11:35 AM EDT	Special Weather Statement	MRX	Campbell, Scott	40 min
Jun 25, 12:20 PM EDT	Special Weather Statement	MRX	Loudon, Roane	40 min
Jun 25, 12:34 PM EDT	Special Weather Statement	MRX	Bledsoe, Rhea	41 min
Jun 25, 1:01 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox, Sevier	44 min
Jun 25, 1:05 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Loudon	55 min
Jun 25, 1:27 PM EDT	Special Weather Statement	MRX	Campbell, Morgan, Scott	48 min
Jun 25, 1:30 PM EDT	Special Weather Statement	MRX	Bradley, Hamilton	45 min
Jun 25, 1:34 PM EDT	Special Weather Statement	MRX	Blount, Sevier	41 min
Jun 25, 1:43 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Morgan, Scott	50 min
Jun 25, 1:45 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Cocke, Jefferson, Knox, Sevier	60 min
Jun 25, 1:47 PM EDT	Special Weather Statement	MRX	Loudon, McMinn, Meigs, Rhea, Roane	58 min
Jun 25, 1:55 PM EDT	Severe Thunderstorm Warning	MRX	Hamilton, Loudon, McMinn, Meigs, Monroe, Rhea and 1 more	65 min
Jun 25, 2:15 PM EDT	Special Weather Statement	MRX	Polk	45 min
Jun 25, 2:19 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Grainger, Union	56 min
Jun 25, 2:30 PM EDT	Special Weather Statement	MRX	Washington	45 min
Jun 25, 3:01 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Loudon, McMinn, Monroe, Polk	44 min
Jun 25, 3:09 PM EDT	Special Weather Statement	MRX	Grainger, Hamblen	51 min
Jun 25, 3:10 PM EDT	Special Weather Statement	MRX	Greene, Unicoi	50 min
Jun 25, 3:25 PM EDT	Special Weather Statement	MRX	Carter, Johnson	50 min
Jun 25, 3:53 PM EDT	Severe Thunderstorm Warning	MRX	Johnson, Sullivan	37 min
Jun 25, 4:33 PM EDT	Special Weather Statement	MRX	Johnson	27 min
Jun 25, 5:42 PM EDT	Special Weather Statement	MRX	Morgan	48 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.