Alert archive / Tennessee / Special Weather Statements in 2017

Special Weather Statement, NWS Morristown, TN

April 5, 20174 counties in Tennessee

NWS Morristown, TN issued this special weather statement at Apr 5, 2017, 8:55 PM EDT for 4 counties in Tennessee. It was in force for 50 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
Apr 5, 2017, 8:55 PM EDT (00:55 UTC)
Expired
Apr 5, 2017, 9:45 PM EDT
In force
50 min
Issued by
NWS Morristown, TN

Counties Claiborne County, TN, Grainger County, TN, Hancock County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 26 km from the middle of the area, began a volume at 00:57 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

Nashville Metro, TN (KBNA), launched 00:00Z, 0.9 hours before the alert went out and 280 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-pSkew-T log-p diagram, Nashville Metro, TN at 00:00Z on 2017-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 00:00Z on 2017-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -96 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2789 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
-96 m²/s²
0-3 km storm-relative helicity
30 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Apr 5, 7:25 PM EDT, 1 hour 30 minutes earlier.

Area forecast discussion, Apr 5, 7:25 PM EDT, 1 hour 30 minutes before
Area Forecast Discussion
National Weather Service Morristown TN
725 PM EDT Wed Apr 5 2017

.Aviation...Main concerns are the following:

1) Severe storms at CHA between 00-01Z,TYS between 01-03Z, and TRI
between 03-05Z.
2) MVFR ceiling and showers spreading back into the area around
daybreak Thursday.
3) Strong westerly winds developing behind FROPA between 09-13Z
Thursday. West winds between 20 and 30kts gusting up to 35kts
are expected for Thursday.

Given shear and instability later today along with synoptic forcing,
threat for severe storms will increase. Shear and instability is
sufficient for tornadoes across the CHA area through 01Z.

Besides the tornado threat, strong winds aloft, lowering freezing
level, and increasing HAIL CAPES may produce some damaging winds and
large hail up to Golfball size at CHA/TYS this evening.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             48  56  39  60 /  70  60  10   0
Knoxville McGhee Tyson Airport, TN  48  53  38  57 /  80  70  40  10
Oak Ridge, TN                       48  54  38  58 /  80  70  30  10
Tri Cities Airport, TN              47  50  34  50 /  90  80  60  20

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...None.
TN...Winter Weather Advisory from 8 AM Thursday to 8 AM EDT Friday
 for Blount Smoky Mountains-Cocke Smoky Mountains-Johnson- Sevier
Smoky Mountains-Southeast Carter-Southeast Greene- Southeast Monroe-
Unicoi.

VA...Winter Weather Advisory from 8 AM Thursday to 8 AM EDT Friday
 for Wise.

&&
Hazardous weather outlook, Apr 5, 4:33 PM EDT, 4 hours 22 minutes before
Hazardous Weather Outlook
National Weather Service Morristown TN
433 PM EDT Wed Apr 5 2017

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-062045-
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-
433 PM EDT Wed Apr 5 2017 /333 PM CDT Wed Apr 5 2017/

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

.DAY ONE...This Afternoon and Tonight

...Outbreak of Severe Thunderstorms Expected Across the Eastern
Tennessee Valley and Southern Appalachian Region This Afternoon
and Evening...

A strong upper-level storm system will move into the region
on today. The associated cold front is expected to trigger
scattered to numerous severe thunderstorms through this evening.
Damaging straight-line winds in excess of 60 mph and hail up to
the size of golfball will be possible with these storms.

A few tornadoes will also be possible with the strongest
storms. Additionally, a localized strong tornado cannot be ruled
out, particularly along the Cumberland Plateau and across
southeast Tennessee.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

...Winter Weather Advisory is in effect for the Mountains of
southwest Virginia and far east Tennessee...

A strong cold front will move across area tonight with colder air
spilling into the southern Appalachians. The cold air will allow
the rain showers to change to snow across the higher elevations
Thursday morning.

Snow accumulations of 3 to 6 inches are possible at elevations at
or above 4000 feet, and 1 to 3 inches between 2500 and 4000 feet,
by Thursday evening. Heavier amounts are possible across the
highest elevations. A dusting or less of snow is expected
elsewhere in areas below 2500 to 3000 feet.

After this system moves through winds out of the northwest will
increase Thursday into Friday, especially in the higher
elevations. Winds of 30-40 mph with higher gusts will be possible,
especially at elevations above 2500 feet. A Wind Advisory may be
needed at a later time to address this.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed this afternoon and evening in
support of severe weather operations.

In the hours before

Special weather statement, Apr 5, 7:46 PM EDT, 1 hour 9 minutes before
Special Weather Statement
National Weather Service Morristown TN
746 PM EDT WED APR 5 2017

TNZ012-013-035>037-067-060030-
Anderson TN-Roane TN-Campbell TN-Scott TN-Union TN-Morgan TN-
746 PM EDT WED APR 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MORGAN...ANDERSON...
CAMPBELL...NORTHERN ROANE...SOUTHEASTERN SCOTT AND SOUTHWESTERN UNION
COUNTIES UNTIL 830 PM EDT...

At 745 PM EDT, Doppler radar was tracking a strong thunderstorm near
Midtown, or near Rockwood, moving northeast at 55 mph.

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

Locations impacted include...
Oak Ridge, Clinton, La Follette, Rockwood, Wartburg, Oliver Springs,
Jacksboro, Midtown, Harriman, Caryville, Lake City, Norris, Oakdale,
Coalfield, Big Ridge S.p., Smokey Junction, Rosedale, Dearmond,
Norris Dam S.p. and Fincastle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Occasional 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.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

A tornado watch remains in effect until 1000 PM EDT for eastern
Tennessee.

LAT...LON 3624 8386 3583 8464 3590 8470 3590 8468
      3599 8472 3605 8478 3651 8414
TIME...MOT...LOC 2345Z 230DEG 49KT 3596 8463
Special weather statement, Apr 5, 8:00 PM EDT, 55 minutes before
Special Weather Statement
National Weather Service Morristown TN
800 PM EDT WED APR 5 2017

TNZ081>085-098>100-060100-
Sequatchie TN-Rhea TN-Bledsoe TN-Marion TN-Bradley TN-Hamilton TN-
Meigs TN-McMinn TN-
800 PM EDT WED APR 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR RHEA...BRADLEY...SEQUATCHIE...
MEIGS...BLEDSOE...MCMINN...MARION AND HAMILTON COUNTIES UNTIL 900 PM
EDT/800 PM CDT/...

At 759 PM EDT/659 PM CDT/, Doppler radar was tracking strong
thunderstorms along a line extending from 7 miles northeast of Spring
City to 6 miles south of Dayton to near Fairmount to near Jasper.
Movement was northeast at 40 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Chattanooga, Cleveland, Athens, Dayton, Sweetwater, Dunlap, Jasper,
Pikeville, Decatur, Soddy-Daisy, Signal Mountain, South Pittsburg,
Spring City, Walden, Lakesite, Whitwell, Kimball, Charleston,
Ridgeside and Harrison.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

A tornado watch remains in effect until 1000 PM EDT/900 PM CDT/ for
eastern Tennessee.

LAT...LON 3499 8582 3524 8569 3529 8570 3532 8556
      3538 8549 3549 8554 3553 8560 3557 8542
      3575 8527 3577 8504 3575 8503 3580 8485
      3569 8463 3564 8462 3563 8452 3557 8450
      3527 8464 3524 8471 3517 8470 3499 8478
TIME...MOT...LOC 2359Z 233DEG 51KT 3576 8476 3540 8501 3523 8538 3501
8557
Local storm report, Apr 5, 8:01 PM EDT, 54 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
801 PM EDT WED APR 05 2017

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

0730 PM     HAIL             DUNLAP                  35.37N 85.39W
04/05/2017  M1.00 INCH       SEQUATCHIE         TN   EMERGENCY MNGR

            HAIL RANGED IN SIZE FROM A NICKEL TO A QUARTER.

&&
Special weather statement, Apr 5, 8:12 PM EDT, 43 minutes before
Special Weather Statement
National Weather Service Morristown TN
812 PM EDT WED APR 5 2017

TNZ036-037-067>069-060100-
Anderson TN-Roane TN-Loudon TN-Union TN-Knox TN-
812 PM EDT WED APR 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL LOUDON...KNOX...
ANDERSON...ROANE AND SOUTHWESTERN UNION COUNTIES UNTIL 900 PM EDT...

At 811 PM EDT, Doppler radar was tracking a strong thunderstorm over
Fairview, or 8 miles southwest of Kingston, moving northeast at 50
mph.

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

Locations impacted include...
Knoxville, Oak Ridge, Clinton, Lenoir City, Alcoa, Kingston,
Rockwood, Loudon, Farragut, Fairview, Oliver Springs, Louisville,
Plainview, Midtown, Harriman, Halls, Norris, Big Ridge S.p., Karns
and Dearmond.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Occasional 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.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

A tornado watch remains in effect until 1000 PM EDT for eastern
Tennessee.

LAT...LON 3571 8462 3573 8464 3572 8469 3582 8477
      3598 8452 3602 8438 3605 8434 3607 8436
      3623 8411 3623 8407 3625 8408 3628 8403
      3628 8399 3632 8397 3600 8366 3584 8407
      3583 8412 3585 8414 3584 8414 3564 8462
TIME...MOT...LOC 0011Z 239DEG 60KT 3577 8460
Special weather statement, Apr 5, 8:23 PM EDT, 32 minutes before
Special Weather Statement
National Weather Service Morristown TN
823 PM EDT WED APR 5 2017

TNZ013-014-036-037-060115-
Anderson TN-Claiborne TN-Campbell TN-Union TN-
823 PM EDT WED APR 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR CLAIBORNE...NORTHEASTERN
ANDERSON...CENTRAL CAMPBELL AND NORTHERN UNION COUNTIES UNTIL 915 PM
EDT...

At 823 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles south of Jacksboro, or 9 miles north of Clinton, moving
northeast at 60 mph.

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

Locations impacted include...
Clinton, La Follette, New Tazewell, Tazewell, Jacksboro, Harrogate,
Caryville, Lake City, Norris, Springdale, Cove Lake S.p., Cumberland
Gap, Arthur, Andersonville, Sharps Chapel, Disney, Norris Dam S.p.,
Clairfield, Powell River Preserve and Fincastle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Occasional 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.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

A tornado watch remains in effect until 1000 PM EDT for eastern
Tennessee.

LAT...LON 3659 8346 3657 8342 3609 8419 3622 8434
      3659 8397 3658 8369 3660 8368
TIME...MOT...LOC 0023Z 228DEG 54KT 3622 8418
Special weather statement, Apr 5, 8:55 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Morristown TN
855 PM EDT WED APR 5 2017

TNZ014-015-037-038-060145-
Claiborne TN-Hancock TN-Union TN-Grainger TN-
855 PM EDT WED APR 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN CLAIBORNE...HANCOCK...
NORTHERN GRAINGER AND UNION COUNTIES UNTIL 945 PM EDT...

At 855 PM EDT, Doppler radar was tracking a strong thunderstorm near
Maynardville, moving northeast at 50 mph.

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

Locations impacted include...
Maynardville, Sneedville, Rutledge, New Tazewell, Tazewell,
Plainview, Blaine, Luttrell, Springdale, Lone Mountain, Howard
Quarter, Big Ridge S.p., Thorn Hill, Evanston, Rose Hill, Sharps
Chapel, Sandlick, Powell River Preserve, Joppa and Norris Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Occasional 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.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

A tornado watch remains in effect until 1000 PM EDT for eastern
Tennessee.

LAT...LON 3659 8294 3651 8312 3647 8316 3615 8372
      3617 8374 3617 8385 3629 8398 3633 8397
      3659 8354
TIME...MOT...LOC 0055Z 239DEG 45KT 3628 8385

EMH

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 5, 8:00 PM EDTSpecial Weather StatementMRXBledsoe, Bradley, Hamilton, McMinn, Marion, Meigs and 2 more60 min
Apr 5, 8:10 PM EDTSevere Thunderstorm WarningMRXHamilton, Marion, Meigs, Sequatchie65 min
Apr 5, 8:10 PM EDTWind AdvisoryMRXAnderson, Bledsoe, Blount, Bradley, Campbell, Carter and 27 more31 hr
Apr 5, 8:12 PM EDTSpecial Weather StatementMRXAnderson, Knox, Roane48 min
Apr 5, 8:23 PM EDTSpecial Weather StatementMRXAnderson, Claiborne52 min
Apr 5, 8:58 PM EDTSpecial Weather StatementMRXBradley, McMinn, Meigs, Polk62 min
Apr 5, 9:00 PM EDTSpecial Weather StatementMRXKnox45 min
Apr 5, 9:19 PM EDTSevere Thunderstorm WarningMRXGrainger, Jefferson, Knox, Union26 min
Apr 5, 9:42 PM EDTSevere Thunderstorm WarningMRXGrainger, Hamblen, Jefferson, Knox39 min
Apr 5, 10:15 PM EDTSevere Thunderstorm WarningMRXCocke, Greene, Hamblen, Hawkins, Jefferson27 min
Apr 6, 3:36 PM EDTFreeze WatchMRXBlount, Campbell, Carter, Claiborne, Cocke, Greene and 11 more24 hr
Apr 5, 10:22 PM EDTSpecial Weather StatementMRXRussell, Scott, Washington, Wise, City of Norton53 min

Nearby

Special Weather Statements in Tennessee, 2017Every special weather statement in 2017

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.