National Weather Service Text Product Display

Area Forecast Discussion
Issued by NWS Knoxville/Tri Cities, TN

Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

-- Highlight Changed Discussion --

-- Discussion containing changed information from previous version are highlighted. --
639
FXUS64 KMRX 201928
AFDMRX

Area Forecast Discussion
National Weather Service Morristown TN
328 PM EDT Sun Aug 20 2017

.SHORT TERM...-- Changed Discussion --(Tonight and Monday)...Skies are mostly sunny and
very warm to hot at mid afternoon with temperatures in the upper
80s to lower 90s. Heat index values are in the lower to mid 90s
this afternoon. High pressure ridge has strengthened over the
forecast area since Saturday and heights may build even more
Monday. Cloud cover is limited to some scattered cu over the
plateau and higher eastern Tennessee and southwest Virginia
mountains. No precipitation is showing up on area radars too.
Pattern looks similar Monday but a slight increase in moisture
from east of the mountains will bring a small chance for showers
and storms to higher elevations of Clay County NC and extreme
northeast Tennessee mountains late afternoon to around sunset.
This should not affect Eclipse viewing during the early to mid
afternoon. The main concern is the warm temperatures and high UV
index before and after the eclipse for people spending the day
outdoors. Not much relief from winds which will be light south to
southwest. Lows tonight should be a couple degrees warmer than
Sundays...mid 60s north and northeast to lower 70s around
Chattanooga.

.LONG TERM...(Monday night through Sunday)...This part of the
forecast remains basically unchanged with the main event being a
high likelihood of frontal convection primarily Tuesday night into
Wednesday with a gradual drop in probability Wednesday night as
the cold front slips south and east onto the Piedmont. Cooler and
drier air builds in for much of the remainder of the extended
forecast. However, had to keep a little bit of an orographic pop
going for the higher terrain features on Saturday and Sunday with
a weak cyclonic flow developing aloft and a hint of an inverted
trough forming at the surface. It still appears that there will be
a nice drop in temperatures behind the cold front with maxes a
good five to ten degrees cooler through the end of the work week
and only a slight warming trend expected over the weekend.

$$-- End Changed Discussion --

.PRELIMINARY POINT TEMPS/POPS...
-- Changed Discussion --Chattanooga Airport, TN 72 92 74 91 / 0 10 0 20
Knoxville McGhee Tyson Airport, TN 69 89 72 90 / 0 10 0 10
Oak Ridge, TN 70 91 72 90 / 0 10 0 20
Tri Cities Airport, TN 65 89 68 88 / 10 10 0 10-- End Changed Discussion --

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

National Weather Service National Headquarters