Special Weather Statement, NWS Morristown, TN

Area Forecast Discussion
National Weather Service Morristown TN
338 PM EDT Sat May 18 2019

.SHORT TERM...(Tonight and Sunday)...

Upper level ridging remains across the southeast and into the
Mid-Atlantic this afternoon with a rather potent shortwave trough
advecting off the Rockies. Closer to the surface, high pressure
remains situated across the area leading to generally clear
skies. Water vapor imagery shows a fairly dry atmosphere in place
with some convection beginning to initiate across western NC.
Convective activity across the MRX area remains uncertain, however
as of discussion time, some of the diurnally driven CU seems to
be showing signs of cooler cloud tops and vertical growth. The
atmosphere is unstable with CAPE values in the 1000 to 2000 J/kg
range. A light southeasterly low level flow could enhance
orographic lift, and along with differential heating could allow
for isolated thunderstorms this afternoon. Again, confidence
remains low but feel the need to keep low end PoPs in the forecast
for the afternoon. Would expect any convection to remain short
lived given the relatively light flow aloft, and no forcing.

Overnight, the aforementioned shortwave aloft will lift northeast
into the Midwest with surface low pressure developing across the
central plains and ejecting northeast into Iowa by Sunday morning.
A cold front attendant this surface low will begin to move into
the Tennessee valley before slowing down as the main dynamics
aloft move into the Great Lakes. An increasing pressure gradient
would promote an increase in southerly flow and gusty winds. The
forecast will remain dry through Sunday afternoon with highs in
the mid to upper 80s.

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

The main headline for the extended will be anomalous ridging
building in across the region for the middle to late part of next
week with mostly dry weather and above normal temperatures. There
will be a large ridge across the Western Atlantic with troughing
across the Central CONUS on Sunday night. A shortwave trough and
closed low will be moving northeast across the Great Lakes. The
occluding surface low will have a slowing cold front which will
approach our area by late Sunday night. Main dynamics remain to our
north and west with this system with weak forcing across our area.
For this reason, expect lower PoPs with the front as it moves east
into our region with the highest PoPs across western and southern
portions of the CWA. Overall, chance PoPs are expected with some low-
end likely PoPs possible across the Cumberland Plateau and southern
Tennessee Valley. Believe that most areas will have light precip
with this system. but it will be lighter and more scattered as the
front approaches compared to further north and west. The front
stalls near our area on Monday before moving quickly north as a warm
front on Tuesday. Could have a few lingering slight chance/chance
PoPs on Monday near the frontal boundary, but expect most areas
remain dry.

Ridging builds in on Wednesday and continues to increase through the
end of the week. Some weak isentropic ascent could lead to a few
scattered showers or thunderstorms on Wednesday morning, but
confidence is low. Even if some develop, slight chance PoPs are all
that's expected Wednesday. The 500mb heights are expected to be near
590 to 594 dam Wednesday afternoon through Friday which is near the
max climatological percentile. This anomalous ridging will keep us
mainly dry and result in max temperatures about 10 to 15 degrees
above normal. Expect we will have a few diurnally driven isolated
showers or thunderstorms across the higher terrain of the mountains,
but most areas should remain dry and unseasonably warm. It will
definitely be a summer-like pattern during the majority of the
extended.

As we get into next weekend, the GFS breaks from the ECMWF and
Canadian by trying to flatten the ridge as several shortwaves move
across the Ohio Valley. However, tend to forecast with persistence
with such a strong ridge, so will trend closer to the ECMWF and
Canadian keeping ridging firmly in place.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             65  87  67  85 /  10  20  50  40
Knoxville McGhee Tyson Airport, TN  66  86  67  84 /  20  10  40  40
Oak Ridge, TN                       65  86  66  85 /  20  10  40  30
Tri Cities Airport, TN              62  86  63  82 /  20  10  20  40

&&

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

AD/JB

Hazardous Weather Outlook
National Weather Service Morristown TN
311 PM EDT Sat May 18 2019

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-191915-
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-
311 PM EDT Sat May 18 2019 /211 PM CDT Sat May 18 2019/

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 at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

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