569
FXUS64 KBMX 160030
AFDBMX

Area Forecast Discussion
National Weather Service Birmingham AL
730 PM CDT Wed May 15 2024

...New AVIATION...

.SHORT TERM...
(This evening through Thursday)
Issued at 1230 PM CDT WED MAY 15 2024

Dry air will filter into the area in the evening. Skies should
clear through the night, with patchy fog possible in a few
locations. Winds should be weakening through the night, so how
quickly those winds weaken may determine where and how much fog
develops. Thursday, high pressure moves across the southeast US
with dry weather and mid level flow shifting from the northwest
in the morning to the southwest by the evening.

Lows tonight will be in the upper 50s and lower 60s due to that
northwest flow, and with mostly clear skies on Thursday, highs
will be a couple of degrees above normal in the mid to upper 80s.

24

&&

.LONG TERM...
(Thursday night through next Tuesday)
Issued at 412 PM CDT WED MAY 15 2024

The beginning of the extended will be wet and unsettled for
Thursday night through Saturday evening as a second upper shortwave
over OK/TX is expected to move NEWD across the Mid MS River Valley
and TWD WV/VA by Sun morning. Model solutions continue to differ
as to the strength of the positive tilted upper low/shortwave as
it progresses across the ERN half of Conus. Instability ramps up
as the morning progresses with the best severe chances in the
afternoon and evening on Friday helped also by a low level jet.
The extent of which will depend somewhat on the morning`s rains
and recovery time afterwards. PWs are high with this event, and
this will help to have some very effective rain producers. The
highest amounts expected will be across the SRN half of the state.
From early Fri through late Sat, anywhere from 1-3 inches of rain
may be noted across the NRN half of C AL and 3-5 inches across
the SRN half (with isolated locally higher amounts). Will be
watching for some flash flooding and possible rises on area rivers
over the weekend.

08

Previous long-term discussion:
(Friday through next Tuesday)
Issued at 349 AM CDT WED MAY 15 2024

A zone of west-southwesterly flow aloft is progged to stretch from
the Texas Gulf Coast through the Southern Appalachians by Friday
morning. This is associated with a positively-tilted upper-level
trough that extends into the Great Lakes with an embedded
disturbance/low nearing the ArkLaTex. While less clear in the low-
levels, latest guidance has trended farther north with a warm
sector, many of which depict an accompanying low-level jet
overspreading the Lower Mississippi and Tennessee Valleys Friday
morning, gradually shifting eastward during the afternoon. This
would place Central Alabama in a favorable parameter space for
strong to severe thunderstorms considering low-level and deep-
layer shear with modest mid-level lapse rates. Various forecast
soundings now suggest MLCAPE <2,500 J/kg west of I-65. Hodographs
suggest supercellular storm modes are also possible.

However, there`s still much uncertainty about how things near the
surface evolve. There`s indication that morning convection could
disrupt the northward expansion of the warm sector, or at least
delay its recovery past peak heating, especially if convection
lingers across the I-10 corridor. There`s also uncertainty
regarding placement of surface boundaries and their respective
orientations. It`s for this reason that it`s also hard to clearly
define placement of flooding potential, though highest PWs and
soil moisture remain across the southern half of the area (thus
higher QPF there for now).

All things considered, and while I hate to say it, there is growing
concern for all severe weather hazards on Friday, with flooding
potential to boot.

In some capacity, lingering convection is forecast across southeast
Central Alabama into Saturday morning, though threats will have
diminished by then. The trough is progged to accelerate to the east
during this time along with the low-level jet. PoPs decrease quickly
west-to-east as a result. Deep-layer ridging is depicted in medium-
range & ensembles thereafter, which supports a period of dry,
warm weather that appears to extend into early next week. Highs in
the 90s could be possible by then.

40/Sizemore

&&

.AVIATION...
(00Z TAFS)
Issued at 654 PM CDT WED MAY 15 2024

Relatively dry conditions are anticipated much of the period.
Expecting VFR conditions with little in the way of ceilings. Some
increase in high clouds possible late Thursday afternoon.
Otherwise, mostly clear conditions. There may be some patchy fog
early Thursday morning but should remain limited in scope. Winds
will become west northwest and light after the few gusts end
within an hour or so.

75

&&

.FIRE WEATHER...

Drier, warmer conditions return to the area on Thursday with
light northwesterly 20 ft winds. Our next weather system moves
into the area on Friday. This will feature widespread rains and
thunderstorms that will persist into Saturday morning.

&&

.PRELIMINARY POINT TEMPS/POPS...
Gadsden     57  87  62  78 /   0   0  20  80
Anniston    58  86  65  80 /   0   0  20  70
Birmingham  59  87  65  79 /   0   0  30  80
Tuscaloosa  60  88  65  81 /   0   0  40  90
Calera      59  87  66  80 /   0   0  40  80
Auburn      61  85  67  80 /   0   0  20  60
Montgomery  61  87  67  83 /   0   0  30  80
Troy        60  88  67  83 /   0   0  20  70

&&

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

$$

SHORT TERM...24
LONG TERM....08
AVIATION...75