727
FXUS64 KHUN 300000
AFDHUN

Area Forecast Discussion
National Weather Service Huntsville AL
700 PM CDT Fri Aug 29 2025

...New AVIATION...

.NEAR TERM...
(Tonight)
Issued at 1254 PM CDT Fri Aug 29 2025

High pressure persisting over the Ohio River Valley will promote
clear and calm conditions across the Tennessee Valley once again
tonight. Additionally, northwest flow out of Canada will continue
to transport and reinforce this cool, dry air mass. This will
enable a good setup for radiational cooling across the area once
again tonight. As a result, temperatures to dip into the upper
50s into the low 60s tonight. Some very localized patchy fog will
be possible in sheltered valley locations along rivers/lakes late
tonight into early Saturday morning -- but most locations will
remain free of fog.

&&

.SHORT TERM...
(Saturday through Monday)
Issued at 1052 AM CDT Fri Aug 29 2025

High pressure at the surface will continue to prevail Saturday
and Sunday heading into the Labor Day holiday weekend, with
continued warm/dry conditions and plenty of sunshine to enjoy.
Highs will again peak between 85-90 degrees with lows in the lower
60s in most locations. The ridge will shift eastward by Monday
(Labor Day), allowing the aforementioned frontal boundary to move
further to the north. A gradual moisture return and diurnal
heating will help to generate low to medium chances for showers
and thunderstorms in the afternoon/evening on Monday.

&&

.LONG TERM...
(Monday Night through Thursday)
Issued at 1025 PM CDT Thu Aug 28 2025

During the timeframe from Monday night-Tuesday night, the
coverage of convection is expected to increase region-wide, as a
south-southwesterly low-level jet will become established in
advance of a low-amplitude 500-mb wave dropping southeastward from
the northern Plains into the Mid-MS Valley (within the flow
around an amplifying northern stream trough digging south-
southeastward across central Canada). The southeastward-advancing
wave may lead to development of a surface trough across the Lower
MS Valley, which could ultimately interact with the remnants of
the backdoor cold front, leading to an increase in showers and
thunderstorms. Although richer moisture/higher CAPE may be
confined to our south, instability will be sufficient for
thunderstorms and locally heavy rain will be possible.

Rain and thunderstorms will begin to diminish in coverage from
W-to-E at some point Wednesday/Wednesday night as the mid-level
wave ejects northeastward into the Upper OH Valley. However, as a
deepening surface low (related to the northern stream trough)
begins to shift eastward across the northern Great Lakes/southern
Ontario, a stronger cold front will sweep southeastward into the
TN Valley on Thursday, potentially resulting in another round of
showers and thunderstorms (if moisture/instability are still
present). Should this occur, mid-level westerly flow of 30-40
knots may support a few stronger and more organized thunderstorms
during this period. Highs from Monday-Thursday will fall back into
the u70s-l80s due to clouds and precipitation, with lows
remaining in the l-m 60s.

&&

.AVIATION...
(00Z TAFS)
Issued at 700 PM CDT Fri Aug 29 2025

Multi-layer clouds (consisting of few high-based Cu and sct-bkn
As/Cs) will continue to spread southeastward across the TN Valley
this evening and overnight, as a weak upper-level disturbance
tracks across the region in NW flow aloft. However, conditions
will remain VFR at the HSV/MSL terminals, especially as the clouds
may confine development of BF/FG early Sat morning to valleys and
lakes. Mid/high-lvl clouds will clear the region btwn 12-18Z,
with a NE wind of 5-10 kts expected during the afternoon.

&&

.HUN WATCHES/WARNINGS/ADVISORIES...
AL...None.
TN...None.

&&

$$

NEAR TERM...AM
SHORT TERM...AMP
LONG TERM...70/DD
AVIATION...70/DD