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797
FXUS64 KMRX 211933
AFDMRX

Area Forecast Discussion
National Weather Service Morristown TN
333 PM EDT Tue May 21 2024

...New SHORT TERM, LONG TERM...

.SHORT TERM...
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(This evening through Wednesday)
Issued at 251 PM EDT Tue May 21 2024

Key Messages:

1. Mostly dry through Wednesday with above normal temperatures.


Discussion:

A moderate CU field is in place across the east TN mountains this
afternoon. Isolated showers and storms should begin to pop up
shortly and persist until this evening. Otherwise, quiet overnight
along with mild overnight temps.

Tomorrow, ridging begins to shift east as an upper trough approaches
from the northwest. High pressure hold strong across the Gulf
though, and the cold front slows down and remains to our north and
west. Because of this, we should remain mostly dry , other than some
slight chance POPs across the Cumberland Plateau, east TN mountains,
and southwest VA during the afternoon hours.
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&&

.LONG TERM...
-- Changed Discussion --
(Wednesday night through next Tuesday)
Issued at 251 PM EDT Tue May 21 2024

Key Messages:

1. Daily chances for showers and thunderstorms Thursday into
early next week.

2. Temperatures will generally remain near to slightly above normal.

Discussion:

The couple of days of nice weather will come to an end late
Wednesday night into Thursday, as troughing begins to extend across
the northern US and we undergo a quasi-zonal flow pattern the rest
of long term period into next week. Daily chances of showers and
thunderstorms will be possible Thursday through Memorial Day
weekend, and even into early next week. Shortwave ripples within
the flow will cycle west to east, providing the support needed
for the development of unsettled weather. A stationary front that
will hang to our north and eventually south of us through
approximately Friday, will also aid precipitation chances as
well.

MLCAPEs through Saturday will be in the hundreds to low thousands
J/kg. The one day that does stand out, however, is Sunday when a
potentially more potent shortwave rounds the trough to our north.
MLCAPEs show values up to and over 2000 J/kg Sunday afternoon. SPC
is already highlighting this set-up in their outlook, where
western parts of our CWA are within the 15 percent oval.

Generally, each day may run the risk of thunderstorm wind gusts,
hail, and flooding from repeated rounds or heavy rain rates.
Specifics as far as strong to severe thunderstorm potential is too
early to know as timing of the shortwaves will play a role. With
no real southerly flow, temperatures will remain around to just
above normal through the period.
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&&

.AVIATION...
(18Z TAFS)
Issued at 1247 PM EDT Tue May 21 2024

VFR conditions through the period at all sites, along with light
southerly winds at CHA and west southwest at TYS and TRI, less
than 10kts.

&&

.PRELIMINARY POINT TEMPS/POPS...
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Chattanooga Airport, TN             67  88  69  86 /  10  10  20  30
Knoxville McGhee Tyson Airport, TN  65  84  67  81 /  10  10  20  60
Oak Ridge, TN                       65  83  67  80 /  10  10  30  70
Tri Cities Airport, TN              62  83  63  78 /  10  10  20  70
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&&

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

$$

SHORT TERM...KS
AVIATION...