-- Discussion containing changed information from previous version are highlighted. --
625
FXUS64 KBMX 170111
AFDBMX

Area Forecast Discussion
National Weather Service Birmingham AL
811 PM CDT Sun Jun 16 2024

...New SHORT TERM, AVIATION...

.SHORT TERM...
-- Changed Discussion --
(Tonight through Tuesday)
Issued at 802 PM CDT SUN JUN 16 2024

What`s left of the sea breeze circulation has moved north and was
in the vicinity of Tuscaloosa/Birmingham/ Anniston early this
evening. The convection has decreased quite a bit, but did leave a
20 pop in the next few hours as boundaries interactions may cause
a pop up shower/storm. Otherwise, many locations have already
dropped into the 70s behind this boundary while the remaining
sites ranged from 80 to 90. No changes planned overnight with lows
still anticipated mainly in the 70s. Monday looks good too with
better rain chances west as a large surface high encompasses much
of the eastern CONUS and was centered in the western Atlantic.

75

Previous short-term discussion:
(This afternoon through Monday)
Issued at 1230 PM CDT SUN JUN 16 2024

Showers and storms will linger for a couple of hours after sunset
due to mesoscale boundary collisions and interactions and then
diminish overnight. Partly to mostly cloudy skies are expected
overnight with southeasterly flow aloft continuing. The upper
ridge will continue to build and broaden over the Mid-Atlantic
states during the day on Monday. As 700mb flow becomes more
easterly by Monday afternoon, drier air will advect westward from
Georgia and the Carolinas. Due to the influence from the upper
ridge, PoPs will be more isolated across the eastern counties,
while scattered to numerous showers and storms are possible across
the western counties, as 500mb shortwave activity and highest
PWATs will still exist. Temperatures are expected to be a tad
cooler Monday afternoon, but most folks won`t notice much of a
difference as highs top out in the low to mid 90s.

56/GDG
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&&

.LONG TERM...
(Monday night through next Saturday)
Issued at 1235 PM CDT SUN JUN 16 2024

An incredibly strong mid-level ridge will be positioned over
North Carolina and Southern Virginia to start the long-term
forecast period. The ridging will remain strong and expansive
though midweek while a disturbance becomes more organized over the
Bay of Campeche and migrates northwest toward the Southeast Texas
Coast through Wednesday. The robust ridging will continue to
persist, becoming elongated from over the Mid Atlantic Region west
to over the Central Mississippi River Valley Region toward the
end of this forecast period. The elongated ridging configuration
will result in a mid-level weakness to develop over the much of
Florida and the Eastern Gulf of Mexico, allowing an easterly wave
to move westward toward the Central Gulf Coast Region on Friday.

Similar trends were noted compared with the previous shift with
guidance high temperatures being too warm in the late week time
frame, so adjusted downward accordingly. The ridging influence
through mid week will keep PoPs quite low through Thursday.
Isolated showers and storms are expected generally along and
southeast of Interstate 59 with a scattered coverage near and
southeast of Interstate 85 on Friday. A reduction in activity is
forecast overnight followed by isolated showers and storms
areawide with scattered activity across the far southeast counties
during the day on Saturday in association with the deep tropical
moisture.

05

Previous long-term discussion:
(Monday night through Saturday)
Issued at 323 AM CDT SUN JUN 16 2024

A highly anomalous and potentially unprecedented deep-layer ridge
to our east, will expand on Tuesday, with its center shifting
from North Carolina to near New York City. As the ridge remains
nearly stationary through Thursday, 500 mb heights may reach an
incredible 600 dam. At the southern periphery of the ridge, drier
air circulating around the ridge will move into Alabama from the
east. PWAT values should drop below 1.5 inches on Tuesday and
persist through Thursday. The easterly flow from the Atlantic
should serve to moderate temperatures as well. NBM temperatures
are well above MEX guidance through the long term period, which
does not seem reasonable given reduced 850 mb temperatures and
low-level thickness values. Therefore, this update undercuts NBM
by 2 to 5 degrees for afternoon highs and 1 to 3 degrees for
morning lows, for Tuesday through Saturday.

A tropical wave embedded within easterly flow could begin to reach
our eastern counties on Friday. This may bring an increase in rain
chances that could continue into Saturday.

87/Grantham

&&

.AVIATION...
-- Changed Discussion --
(00Z TAFS)
Issued at 802 PM CDT SUN JUN 16 2024

VFR conditions are anticipated through this cycle. Any remaining
convection will diminish within a few hours. We will be left with
mid and upper level clouds from the convection. Winds become calm
to light southeast. On Monday, rain/storm chances will be better
west and have a PROB30 mention in the afternoon. Winds becoming
southeast 5-10kts.

75
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&&

.FIRE WEATHER...

Showers and thunderstorms are possible Sunday afternoon across
much of the area, although spatial coverage looks to be somewhat
limited. 20-foot winds will be southeasterly up to 6-8 mph each
day through Tuesday evening. Afternoon min RH values are expected
to drop into the 35-45 percent range Sunday and remain above 40
percent on Monday and Tuesday.

&&

.PRELIMINARY POINT TEMPS/POPS...
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Gadsden     70  94  70  90 /  20  20  10   0
Anniston    72  93  71  89 /  20  20   0   0
Birmingham  73  93  74  91 /  20  30  10   0
Tuscaloosa  74  91  73  90 /  20  40  10  10
Calera      73  93  73  90 /  20  30  10   0
Auburn      73  91  70  88 /  20  20   0   0
Montgomery  73  94  73  89 /  20  30  10   0
Troy        71  93  70  89 /  20  30   0  10
-- End Changed Discussion --

&&

.BMX WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

SHORT TERM...75
LONG TERM....05
AVIATION...75