-- Discussion containing changed information from previous version are highlighted. --
738
FXUS64 KHUN 221955
AFDHUN

Area Forecast Discussion
National Weather Service Huntsville AL
255 PM CDT Wed May 22 2024

...New NEAR TERM, SHORT TERM...

.NEAR TERM...
-- Changed Discussion --
(Rest of Today and Tonight)
Issued at 255 PM CDT Wed May 22 2024

Warm moist conditions will continue through the afternoon with
fair weather cumulus developing over nearly the whole area. The
feature of interest will be a cold front draped just NW of us
triggering severe storms in AR/MS/TN. This boundary will continue
to propagated generally southeast through the duration of the near
term. The concern currently is the fact that storms have fired up
slightly earlier and slightly further east than models have
indicated. An earlier arrival of severe storms mean a better
thermodynamic profile for storms to take advantage of. As storms
enter NW AL CAMS indicate they will have 2000+ J/KG of CAPE to
work with. With sufficient shear and 7 C/KM + lapse rates in
place, storms that enter the area before sunset will pose a threat
for hail, damaging winds, and frequent lightning. Best chances
and highest confidence in seeing strong to severe storms is in NW
AL and our TN counties.

The front will continue to move east after sunset which will
support a gradual decrease in severe storm potential both through
the night and as storms move east. Showers and generally
thunderstorms will likely remain through the night as the front
takes its sweet time traversing the area.
-- End Changed Discussion --

&&

.SHORT TERM...
-- Changed Discussion --
(Thursday through Saturday)
Issued at 255 PM CDT Wed May 22 2024

Thursday morning we will be greeted again by the lingering front
promoting more widespread showers and perhaps a few rumbles of
thunder across the area. Rain and thunder chances will decrease
through mid day as the front moves on. Chances for storms will
then transition to being driven by day time heating. If we can
clear out and heat up, strong to severe storms will be again
possible Thursday afternoon. Beyond Thursday afternoon, several
shortwaves will ripple NE through the area and promote high
chances for rain overnight on Thursday and through the day on
Friday. This will be mostly rinse and repeat into Saturday as
rain and storm chances again pick back up in the afternoon.

Each day storms will pose a threat for hail, gusty winds, and
frequent lightning. Those with outdoor activities this weekend
will need to remain vigilant. Aside from storm chances, our temps
will remain in the mid to high 80s making for very muggy
conditions during the dry slots of the day.
-- End Changed Discussion --

&&

.LONG TERM...
-- Changed Discussion --
(Saturday night through Tuesday)
Issued at 255 PM CDT Wed May 22 2024

No big changes made to the extended portion. A powerful system moving
from the south/central Plains to the southern Great Lakes will keep
chances of showers and thunderstorms in the forecast for the Tennessee
Valley this weekend into Tuesday. More numerous, and possibly strong
to severe storms look more probable Sunday into Memorial Day. These
will be preceding, and possibly accompanying a cold front moving
across the area Monday. Dry weather and slightly cooler conditions
return late Tuesday into Wednesday.

Previous discussion...
Issued at 354 AM CDT Wed May 22 2024

A more vigorous shortwave will pivot from the central/southern
Plains into the Ohio Valley/Great Lakes on Sunday, bringing
widespread convection to portions of the Mid South and lower Ohio
Valley -- including the potential for a regional outbreak of
severe weather over those regions. Closer to home here in the
Tennessee Valley, a threat for strong to severe thunderstorms will
also exist. Guidance hints at an initial wave of prefrontal
convection during the morning hours on Sunday, followed by an
additional round during the evening hours (into portions of the
overnight hours) directly along the cold front has it pushes
through the area. This second round would be more likely to pose a
threat for severe weather given the potential storm environment in
place. However, it is too early to get too specific on timing
given uncertainties in the evolution of this system and what
exactly the storm environment would support. Still this bears
close watching in the coming days, especially given that it will
occur during the busy Memorial Holiday weekend. Additional chances
for showers and storms will exist Monday (40-60%) and Tuesday
(20-30%) before ridging helps to dry us out by the middle of next
week. By Tuesday, guidance favors a subtle air mass chance as
drier air works its way in and highs in the upper 70s to lower 80s
will be common.
-- End Changed Discussion --

&&

.AVIATION...
(18Z TAFS)
Issued at 1210 PM CDT Wed May 22 2024

The prevailing terminal conditions will be VFR through the TAF
period. It is likely we will see showers and thunderstorms this
evening and overnight however their timing and location are highly
uncertain right now. Better chances for storms will develop just
before 0Z with MSL being more favorable. TS will be possible
through the night yet with low confidence in timing and coverage
kept it as VCTS in the TAF. Tomorrow morning showers will remain a
possibility yet TS is less likely thus kept it as VCSH in the TAF.

&&

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

$$

NEAR TERM...RAD
SHORT TERM....RAD
LONG TERM....AMP/RSB
AVIATION...RAD