379 
FXUS64 KMRX 091748
AFDMRX

Area Forecast Discussion
National Weather Service Morristown TN
148 PM EDT Tue Jun 9 2026

...New DISCUSSION, AVIATION...

.KEY MESSAGES...
Updated at 133 PM EDT Tue Jun 9 2026

- Scattered showers and thunderstorms with heavy rains will
  present a threat of isolated flash flooding this afternoon and
  again tomorrow. A front will approach on Friday for another 
  chance of scattered storms across the area too. 

- Frontal passage on Friday into Saturday will give a short
  reprieve of muggy conditions over the weekend.

- Another slug of high PWAT air moves in on Monday for more
  chances of showers and thunderstorms and associated heavy rain.

&&

.DISCUSSION...
Issued at 133 PM EDT Tue Jun 9 2026

Currently have a nearly stationary boundary situated north to 
south from our far western VA counties, southward through the 
Smokies and into our western NC counties this afternoon. Regional 
radar imagery shows a line of showers roughly aligned with this 
boundary and slowly shifting east with time. Aloft, 

A weak upper trough is working its way through the Appalachian 
region today, skirting the northern periphery of a deep south 
ridge anchored over the Louisiana coastline. At the surface, a 
line of showers is aligned with a nearly stationary boundary that 
is situated below this trough, stretching from our VA counties 
southward through the Smokies and into far western NC this 
afternoon. PWATs remain around or slightly above 1.9". With 
wetbulb zero heights within a few hundred feet of freezing levels,
both of which are above 13k ft AGL, the combination of efficient 
warm rain processes and high PWATs will incentives high rainfall 
rates in what convection is present through this evening and the 
overnight period. For areas around and north of the I-40 corridor,
both 1hr and 3hr flash flood guidance is generally below 2 
inches. While widespread flash flooding isn't expected, the 
environment is certainly supportive of heavy rain and at least an 
isolated flash flooding threat. I don't believe a watch is 
necessary, but we'll certainly have to monitor things closely. For
tomorrow, similar conditions will be present, with another 
nocturnal convectively induced shortwave moving out of Kentucky 
and across the northern half of our CWA tomorrow morning into the 
afternoon hours. This will support isolated to scattered showers 
and thunderstorms and another isolated flash flood threat.

The atmosphere dries out some Thursday as the ridge expands 
overhead. Some typical summertime convection over the terrain is 
expected but if I had to bet I think stay dry in the valley.

On Friday a weak front will approach from the northwest. SPC 
currently has areas from our far northern VA counties, further 
northeast highlighted in a Day 4 risk area. This seems reasonable 
as shear and instability increase. Forecast soundings suggest 
there's a possibility of some isolated severe storms further south
in our CWA though, with damaging winds being the concern there. 
However, details are still a little too uncertain to get terribly 
concerned about it just yet. Post-frontal dry air filters in over
the weekend for more comfortable conditions. Then, Sunday into 
Monday there's a possibility of more heavy rains.

&&

.AVIATION...
(18Z TAFS)
Issued at 133 PM EDT Tue Jun 9 2026

ISOLD to SCT SHRA/TSRA will continue across East Tennessee through
this evening, with additional ISOLD SHRA possible overnight. Have
PROB30 and TEMPO groups to account for ongoing convection 
affecting terminals in the next few hours but there's enough 
uncertainty in coverage and placement of overnight storms to 
prohibit including them now. Expect flight categories to drop to
MVFR levels late tonight.

&&

.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN             70  89  71  91 /  20  20   0  10 
Knoxville McGhee Tyson Airport, TN  70  87  71  91 /  40  40  20  20 
Oak Ridge, TN                       69  87  70  90 /  50  50  10  20 
Tri Cities Airport, TN              67  83  68  88 /  60  80  30  50 

&&

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

$$

DISCUSSION...CD
AVIATION...CD


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