Alert archive / Tennessee / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 129, NWS Morristown, TN

July 5, 2018McMinn County, Monroe County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 5, 2018, 3:32 PM EDT for McMinn County, Monroe County, Tennessee. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 5, 2018, 3:32 PM EDT (19:32 UTC)
Expired: Jul 5, 2018, 4:15 PM EDT
In force: 43 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties McMinn County, TN, Monroe County, TN

The radar

The Knoxville radar (KMRX), 127 km from the middle of the area, began a volume at 19:34 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 7.5 hours before the alert went out and 218 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: 442 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 668 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

480 
WUUS54 KMRX 051932
SVRMRX
TNC107-123-052015-
/O.NEW.KMRX.SV.W.0129.180705T1932Z-180705T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
332 PM EDT THU JUL 5 2018

The National Weather Service in Morristown has issued a

* Severe Thunderstorm Warning for...
  Southeastern McMinn County in east Tennessee...
  Southwestern Monroe County in east Tennessee...

* Until 415 PM EDT.

* At 332 PM EDT, a severe thunderstorm was located 13 miles southeast
  of Madisonville, moving west at 10 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...
  Madisonville, Tellico Plains, Bullet Creek and Mount Vernon. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3528 8448 3528 8451 3551 8444 3543 8417
      3527 8421 3527 8423 3526 8423
TIME...MOT...LOC 1932Z 100DEG 9KT 3535 8426 

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

SR

1 follow-up statement

302 
WWUS54 KMRX 051949
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
349 PM EDT THU JUL 5 2018

TNC107-123-052015-
/O.CON.KMRX.SV.W.0129.000000T0000Z-180705T2015Z/
McMinn TN-Monroe TN-
349 PM EDT THU JUL 5 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR SOUTHEASTERN MCMINN AND SOUTHWESTERN MONROE COUNTIES...

At 349 PM EDT, a severe thunderstorm was located 11 miles south of
Madisonville, moving west at 10 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...
Tellico Plains, Mount Vernon and Bullet Creek. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3528 8448 3528 8451 3551 8444 3541 8420
      3527 8422 3527 8423
TIME...MOT...LOC 1949Z 100DEG 9KT 3536 8431 

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

SR

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 Jul 5, 3:26 PM EDT, 6 minutes earlier.

Area forecast discussion, Jul 5, 3:26 PM EDT, 6 minutes before

Area Forecast Discussion
National Weather Service Morristown TN
326 PM EDT Thu Jul 5 2018

.SHORT TERM...(Tonight and Friday)...Isolated to scattered showers
and storms will continue to develop this afternoon and continue into
the evening hours. Current CU field suggest the greatest chance for
these showers and storms will be south of I-40 and across our
eastern mountains. However, any storms that develop over the
eastern mountains could still drift into central and northern valley
locations later this afternoon and evening. A few of these storms
may become strong to severe as we have a moist and unstable airmass
in place. Heavy rain and gusty winds will be the main concerns.

Current thinking is that the activity developing near the cold front
across the Ohio River Valley will continue to develop and spread
southward this evening and overnight. Models show this activity
weakening as it draws closer to our area. The main question is does
it completely fall apart before reaching us. Showers and storms then
redevelop tomorrow morning across our northern areas out ahead of
the front. These showers and storms then continue to develop and
move southward toward the central and southern valley through the
day. With little to no shear in place the threat for severe weather
is very low. However, of few of these storms could again be strong
to severe as soundings are moderately unstable. The main threat for
tomorrow is again heavy rain and gusty winds.

Lows tonight will be in lower 70s for most. Highs will be cooler
tomorrow due to the cloud cover in place from showers and storms.
Highs in the low to mid 80s are expected.

.LONG TERM...(Friday night through Wednesday)...Upper level ridge
shifts west and upper level trough settles along east coast. A
weak cold front will also sink south of the region. Another upper
level ridge then builds over the Great Lakes and Ohio Valley.
Scattered showers and a few storms will continue Friday night as
front moves south. Saturday drier air mass filters into the
northern sections of the region but clouds continue in the south
closer to the front. Moisture will still be around southern
sections so there will be a chance of showers and storms. Highs
will be much cooler in the upper 70s to mid 80s. Saturday night
more dry air will filter in and lows will be mainly in the 60s.
Sunday and Monday the Upper ridge strengthens over the region and
this will keep rain chances very low and air mass still rather dry
with lower night time and day time temperatures. Tuesday through
Thursday the ridge begins to break down and moisture increases
from the south. Temperatures will creep back up to the lower 90s
and diurnal slight chance showers and storms will return.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             73  88  71  85 /  50  70  40  40
Knoxville McGhee Tyson Airport, TN  73  86  68  85 /  50  70  30  20
Oak Ridge, TN                       73  85  68  85 /  50  70  30  20
Tri Cities Airport, TN              70  83  65  83 /  50  70  30   0

&&

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

SR/TD

Hazardous weather outlook, Jul 5, 3:28 PM EDT, 4 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
328 PM EDT Thu Jul 5 2018

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-061930-
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-
328 PM EDT Thu Jul 5 2018 /228 PM CDT Thu Jul 5 2018/

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

.DAY ONE...This Afternoon and Tonight

No hazardous weather is expected.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

A frontal boundary will build south across the Southern
Appalachians on Friday, producing scattered to numerous showers
and thunderstorms. There is a small chance that a few of these
storms may become strong to severe. Damaging winds, hail up to
quarter size, frequent lightning, and heavy rainfall are possible.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed Friday.

In the hours before

Special weather statement, Jul 5, 2:20 PM EDT, 1 hour 12 minutes before

Special Weather Statement
National Weather Service Morristown TN
220 PM EDT THU JUL 5 2018

TNZ084-085-100-051900-
Bradley TN-Meigs TN-McMinn TN-
220 PM EDT THU JUL 5 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BRADLEY...
SOUTHWESTERN MEIGS AND SOUTHERN MCMINN COUNTIES UNTIL 300 PM EDT...

At 219 PM EDT, Doppler radar was tracking a strong thunderstorm near
Charleston, or 11 miles southwest of Athens, moving northwest at 10
mph.

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

Locations impacted include...
Athens, Decatur, Etowah, Charleston, Calhoun, Riceville, Hillsview,
Big Spring and Dentville.

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 3528 8495 3529 8494 3531 8497 3536 8497
      3537 8499 3554 8481 3534 8440 3526 8459
      3527 8467 3525 8469 3524 8471 3523 8470
      3522 8470 3521 8473
TIME...MOT...LOC 1819Z 124DEG 7KT 3533 8475

mjb

Special weather statement, Jul 5, 2:45 PM EDT, 47 minutes before

Special Weather Statement
National Weather Service Morristown TN
245 PM EDT THU JUL 5 2018

TNZ071-086-051930-
Northwest Monroe TN-NW Blount TN-
245 PM EDT THU JUL 5 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN BLOUNT AND
NORTHEASTERN MONROE COUNTIES UNTIL 330 PM EDT...

At 244 PM EDT, Doppler radar was tracking a strong thunderstorm 14
miles southwest of Maryville, moving west at 10 mph.

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

Locations impacted include...
Madisonville, Vonore, Citico Beach, Fort Loudon State Park,
Tariffville, McGee Carson Peninsula and Talassee.

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 3534 8426 3561 8439 3564 8425 3562 8425
      3562 8419 3561 8419 3563 8415 3565 8413
      3567 8405 3556 8400
TIME...MOT...LOC 1844Z 068DEG 9KT 3557 8410

TD

Special weather statement, Jul 5, 3:25 PM EDT, 7 minutes before

Special Weather Statement
National Weather Service Morristown TN
325 PM EDT THU JUL 5 2018

TNZ086-087-052015-
Northwest Monroe TN-Southeast Monroe TN-
325 PM EDT THU JUL 5 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN MONROE COUNTY UNTIL
415 PM EDT...

At 324 PM EDT, Doppler radar was tracking a strong thunderstorm 12
miles southeast of Madisonville, moving west at 10 mph.

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

Locations impacted include...
Tellico Plains and Mount Vernon.

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 3532 8445 3533 8440 3534 8440 3534 8441
      3540 8441 3540 8443 3541 8443 3550 8441
      3541 8417 3528 8420 3528 8446
TIME...MOT...LOC 1924Z 100DEG 9KT 3536 8427

SR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 8:19 PM EDT	Special Weather Statement	MRX	Bradley, Hamilton	41 min
Jul 4, 9:18 PM EDT	Special Weather Statement	MRX	Bradley, Hamilton	42 min
Jul 5, 2:20 PM EDT	Special Weather Statement	MRX	McMinn, Meigs	40 min
Jul 5, 2:45 PM EDT	Special Weather Statement	MRX	Monroe	45 min
Jul 5, 3:25 PM EDT	Special Weather Statement	MRX	Monroe	50 min
Jul 5, 4:02 PM EDT	Special Weather Statement	MRX	Blount	43 min
Jul 5, 4:13 PM EDT	Special Weather Statement	MRX	Sevier	47 min
Jul 5, 4:25 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Sevier	37 min
Jul 5, 4:51 PM EDT	Special Weather Statement	MRX	Greene	39 min
Jul 5, 5:37 PM EDT	Special Weather Statement	MRX	Blount	23 min
Jul 5, 5:41 PM EDT	Special Weather Statement	MRX	Washington	34 min
Jul 5, 5:59 PM EDT	Special Weather Statement	MRX	Roane	31 min
Jul 5, 6:08 PM EDT	Special Weather Statement	MRX	Carter	37 min
Jul 5, 6:11 PM EDT	Severe Thunderstorm Warning	MRX	Morgan, Roane	38 min
Jul 5, 6:44 PM EDT	Special Weather Statement	MRX	Washington	46 min
Jul 5, 7:17 PM EDT	Special Weather Statement	MRX	Hawkins	43 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.