Special Weather Statement, NWS Morristown, TN

Area Forecast Discussion
National Weather Service Morristown TN
326 PM EDT Fri Aug 2 2019

.SHORT TERM...(Tonight and Saturday)...

Current radar imagery indicates isolated to scattered showers/storms
across the forecast area. Best coverage, as predicted, has been
across the higher elevations along the TN/NC line. With daytime
heating, SBCAPE values are up into the 1500-2000 J/Kg range. Upper
level flow is around 10-15 kts making deep layer shear values
extremely low. Moisture remains plentiful with PW values around the
75th percentile for early August. In the upper levels, there is a
trough axis that stretches across the forecast area. At the surface,
still seeing a hint of an inverted trough near the Cumberland
Plateau. Overall, not much forcing with a typical summer pattern.
There could be a few stronger storms with heavy rainfall, gusty
winds, and small hail being the main threats. Flash flood guidance
values are lowest near the Tri-Cities area into southwest Virginia
with 3-hr values around 1.5 inches. Therefore, will have to pay
extra close attention to the potential for localized flooding in
these locations. Expect convection will come to an end near sunset
with the loss of daytime heating. Patchy fog will develop overnight
and the coverage will depend on how widespread the showers/storms
are this afternoon and evening. For now, have introduced fog to the
forecast mainly near area rivers and lakes. Overnight lows will be
near climatology across the area in the mid 60s to low 70s.

The trough axis will slowly drift to the southeast throughout the
short-term forecast period. Current water vapor imagery indicates
dry air in the mid to upper levels across middle and west Tennessee.
PW values will drop as the drier air aloft moves in from the west
into the 1.2-1.5 inch range. These values are closer to or just
below the 50th percentile for early August. Model soundings,
especially from the NAM, indicate a decent dry layer aloft on
Saturday afternoon. Due to this, have cut back on PoPs some and
expect coverage of showers and storms will be less than today.
Overall, looking at PoPs in the 20-30% range from most locations
tomorrow afternoon. Highs will once again be near climatology in the
mid to upper 80s for most locations.

.LONG TERM...(Saturday night through Friday)...

Not a lot of change in the extended forecast. Overall, we remain in
troughing pattern with high pressure to our west over the Four
Corners states and a high to our east over Bermuda. Temperatures
will be near normal with chances of rain on most days due to the
lowered heights in place.

Saturday night into Sunday we have a weak cold front approaching
from the north out of the Ohio River Valley. Highest POPs of the
period (likely and high-end chance) occur on Sunday as the front
settles across the area and provides a forcing mechanism for showers
and storms. The frontal location on Monday should be centered along
the spine of the Appalachians. The front, or what's left of it,
slowly pushes eastward through the day and into Monday night. This
gives us no POPs by Monday night as the front is far enough east to
be of no influence.

Tuesday should be mostly dry as we are behind the front, expect for
some diurnal showers and storms across the high terrain. Wednesday
into Thursday the trough deepens as a shortwave dives down into the
flow. This brings back chance POPs across the area. The main
shortwave exits to our east Thursday night into Friday but a weak
secondary wave will dive down into the trough base for Friday
keeping slight chance POPs in for the forecast area.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             71  89  71  85 /  20  40  40  60
Knoxville McGhee Tyson Airport, TN  68  87  69  84 /  20  40  40  60
Oak Ridge, TN                       68  88  70  85 /  30  30  40  60
Tri Cities Airport, TN              64  85  65  83 /  30  20  30  50

&&

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

MA/SR

Hazardous Weather Outlook
National Weather Service Morristown TN
305 AM EDT Fri Aug 2 2019

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-030715-
Cherokee-Clay-Scott-Campbell-Claiborne-Hancock-Hawkins-Sullivan-
Johnson-Morgan-Anderson-Union-Grainger-Hamblen-Northwest Cocke-
Cocke Smoky Mountains-Northwest Greene-Southeast Greene-
Washington-Unicoi-Northwest Carter-Southeast Carter-Roane-Loudon-
Knox-Jefferson-Northwest 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-Russell-
305 AM EDT Fri Aug 2 2019 /205 AM CDT Fri Aug 2 2019/

This Hazardous Weather Outlook is for portions of southwest North
Carolina...east Tennessee and southwest Virginia.

.DAY ONE...Today and Tonight

Scattered showers and thunderstorms can be expected, especially
this afternoon into early evening. A few of these thunderstorms
may become strong to severe, with locally damaging winds along
with torrential downpours which may cause localized flooding.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Numerous showers and thunderstorms on Sunday may have the
potential to produce heavy rainfall and localized flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated, but spotters are encouraged
to submit any reports of severe weather through the web by going
to www.weather.gov/mrx/SpotterReports.

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Special Weather Statement
National Weather Service Morristown TN
142 PM EDT Fri Aug 2 2019

TNZ012-013-036-021830-
Anderson TN-Scott TN-Campbell TN-
142 PM EDT Fri Aug 2 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN ANDERSON...SOUTHWESTERN
CAMPBELL AND SOUTHEASTERN SCOTT COUNTIES UNTIL 230 PM EDT...

At 141 PM EDT, Doppler radar was tracking a strong thunderstorm near
Jacksboro, or 7 miles southwest of La Follette, moving east at 5 mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
La Follette, Jacksboro, Caryville, Lake City, Norris, Norris Dam
State Park, Smokey Junction, Andersonville, Disney, Cove Lake State
Park, Fincastle, Royal Blue and Norma.

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 3619 8437 3639 8440 3645 8404 3618 8401
TIME...MOT...LOC 1741Z 264DEG 6KT 3630 8424

05/MA

Special Weather Statement
National Weather Service Morristown TN
254 PM EDT Fri Aug 2 2019

TNZ071-072-021945-
Blount Smoky Mountains TN-NW Blount TN-
254 PM EDT Fri Aug 2 2019

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL BLOUNT COUNTY UNTIL 345
PM EDT...

At 254 PM EDT, Doppler radar was tracking a strong thunderstorm near
Maryville, moving east at 5 mph.

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

Locations impacted include...
Maryville, Smoky Mountains-Fontana Area, Clover Hill, Talassee,
Walland, Cades Cove and Happy Valley.

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 3554 8400 3556 8400 3555 8401 3554 8404
      3555 8407 3573 8409 3579 8381 3555 8378
      3553 8381
TIME...MOT...LOC 1854Z 264DEG 5KT 3565 8400

05/MA

Special Weather Statement
National Weather Service Morristown TN
323 PM EDT Fri Aug 2 2019

TNZ069-070-073-022015-
Jefferson TN-Knox TN-North Sevier TN-
323 PM EDT Fri Aug 2 2019

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL KNOX...SOUTHWESTERN
JEFFERSON AND NORTHWESTERN SEVIER COUNTIES UNTIL 415 PM EDT...

At 323 PM EDT, Doppler radar was tracking a strong thunderstorm near
Sevierville. This storm was nearly stationary.

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

Locations impacted include...
Knoxville, Sevierville, Strawberry Plains, McMahan, Kodak, Kimberlin
Heights and Seymour.

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 3595 8384 3609 8367 3608 8366 3609 8366
      3610 8367 3611 8365 3610 8365 3610 8363
      3611 8363 3596 8350 3585 8362
TIME...MOT...LOC 1923Z 135DEG 3KT 3596 8364

05/MA

Special Weather Statement
National Weather Service Morristown TN
407 PM EDT Fri Aug 2 2019

TNZ014-038-022045-
Claiborne TN-Grainger TN-
407 PM EDT Fri Aug 2 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN CLAIBORNE AND NORTH
CENTRAL GRAINGER COUNTIES UNTIL 445 PM EDT...

At 407 PM EDT, Doppler radar was tracking a strong thunderstorm near
Tazewell, or 12 miles north of Rutledge, moving southeast at 5 mph.

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

Locations impacted include...
New Tazewell, Tazewell, Howard Quarter and Thorn Hill.

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 3643 8337 3641 8339 3642 8337 3638 8335
      3631 8351 3648 8364 3656 8343
TIME...MOT...LOC 2007Z 331DEG 5KT 3645 8347

DGS