-- Discussion containing changed information from previous version are highlighted. --
848
FXUS64 KHUN 161646
AFDHUN

Area Forecast Discussion
National Weather Service Huntsville AL
1146 AM CDT Sun Jun 16 2024

...New AVIATION...

.NEAR TERM...
(Rest of Today)
Issued at 914 AM CDT Sun Jun 16 2024

Another very hot day on tap for much of the area with temperatures
posed to reach the 90 degree mark in some locations as early as 10
AM! Eventually, scattered decks of cumulus will develop which
should temper heating by the early/mid afternoon. However, not
before highs reach the mid to upper 90s once again. With dewpoints
running a hare higher than yesterday -- peak heat index values
between 100-104 degrees will be common in many locations and metro
areas such as Huntsville-Muscle Shoals-Decatur may exceed 105
degrees briefly this afternoon. All in all, this heat will be
dangerous to vulnerable populations, and everyone is urged
exercise caution during the peak heating of the day. By the
mid afternoon, low chances (20-30%) for a few diurnally driven
storms will return to the forecast during the 21-01z window
mainly. Inverted-V sounding profiles will favor localized gusty
winds being the main impacts with the strongest storms.

&&

.SHORT TERM...
(Tonight through Tuesday)
Issued at 232 AM CDT Sun Jun 16 2024

Any lingering showers/tstms should quickly diminish with the start
of the early evening hrs. Another unseasonably warm/muggy night is
then expected into early Mon, with lows falling mainly into the
mid 70s/near 70F. The upper ridge pattern also looks to remain
fairly stagnant over the southern Atlantic states going into the
abbreviated work week. With a slightly more active southerly flow
pattern developing across the lower MS Valley region coupled with
a continued increase in moisture, a low chc for mainly afternoon
showers/tstms (20-30%) looks to remain in the forecast Mon/Tue.
The pulse like nature of any convection will again allow for a
few stronger storms, capable of gusty winds/brief heavy rainfall.
A slight increase in cloud cover will also translate in afternoon
highs more in the lower 90s/near 90F. Lows Mon night also look to
remain in the mid 70s/near 70F for most spots.

&&

.LONG TERM...
(Tuesday night through Saturday)
Issued at 232 AM CDT Sun Jun 16 2024

Summer-like warmth will continue over much of the southeast and
eastern Lower-48, as strong upper level ridging becomes a controlling
feature for our sensible weather. This upper ridge should be centered
over the coastal Mid Atlantic and New England with maximum heights
around 597 decameters. The ridge will strengthen even more as we go
through second half of the week, peaking at 600 decameters from
Wednesday into late Thursday. The presence of the ridge although
located more to our NE, should be close enough to suppress convection,
due to warm temperatures aloft and subsidence that occurs under
strong areas of high pressure.

Juneteenth/Wednesday should feature more clouds than sun with highs
rising to around 90, which is close to seasonable norms. Overall
atmospheric moisture over this region should decrease Wed night, with
lows around 70. Thursday, and the first day of Summer (which occurs
around 351 PM CDT) should come in style with highs rising into
the low/mid 90s. A tad warmer is expected on Friday with highs in
the mid 90s. Corresponding heat index values on Juneteenth should
range close to the air temperatures in the Wed-Fri timeframe. Low
temps in this period should cool into the upper 60s to lower 70s.

A system of tropical origins could move over the SE coast (north
Florida to South Carolina) in the Thu/Fri timeframe. Output from
the various model camps are uncertain with timing and strength
with this feature. The GFS was the fastest and further south
solution with it coming ashore Thu, while the ECMWF was more over
the GA/SC coast Thu night, and the Canadian over the SC coast Fri
and the weakest depiction. In any case, moisture from the tropics
will move across the Tennessee Valley late Friday into Saturday.
Strong daytime heating Sat with highs in the mid 90s and heat
index values to 101 will produce a more unstable environment.
There appears to be enough moisture to help a few showers and
thunderstorms form Sat afternoon over the entire area.

&&

.AVIATION...
-- Changed Discussion --
(18Z TAFS)
Issued at 1146 AM CDT Sun Jun 16 2024

VFR conditions will be the predominant flight category at both
terminals through the period. Low chances (20-30%) for SHRA/TSRA
are forecast this afternoon between 21-01z. Should a rogue storm
impact either terminal, amendments and AWWs will be needed. Storms
will dissipate shortly after sunset, with VFR conditions
prevailing through the remainder of the period.
-- End Changed Discussion --

&&

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

$$

NEAR TERM...AMP.24
SHORT TERM....09
LONG TERM....RSB
AVIATION...AMP.24