759
FXUS62 KJAX 190102
AFDJAX

Area Forecast Discussion
National Weather Service Jacksonville FL
902 PM EDT Wed Sep 18 2024

...New UPDATE...

.UPDATE...
Issued at 901 PM EDT Wed Sep 18 2024

For the latest NE FL and SE GA Daily Key Messages please visit:
https://www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf

No major updates to the forecast this evening as a few showers
should continua to weaken and dissipate as they drift east from
highway 301 and oer far NW SE GA near Alma. Lows will be near
normal in the the upper 60s over SE GA, around 70 over inland NE
FL and the low 70s along the NE FL coastline. Patchy fog will
develop generally from Gainesville northward across inland zones
with low stratus over the SE GA coast into inland NE FL late
tonight with clam winds away from the coast and light and variable
along the coast.

A weak cold front will move south across the area early Thursday
with light northwest winds as weak high pressure builds over the
TN river valley. Isolated to scattered showers will develop over
NE FL, especially where the cold front and the Atlantic seabreeze
interact with widely isolated thunderstorms potentially over NE FL
over the St Johns river basin to the coast. Highs will be a bit
above normal in the upper 80s over much of SE GA and along the
coast with around 90 inland for much of NE FL. Light northwest
winds will turn easterly from US-17 eastward in the afternoon
hours 5-10 mph.

&&

.NEAR TERM...
Issued at 152 PM EDT Wed Sep 18 2024

For the latest NE FL and SE GA Daily Key Messages please visit:
https://www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf

Still anticipating higher storm coverage near the northeast
Florida coast this afternoon and early evening, with gusty winds
being the primary threat. By about 8pm, most convection will
simmer down or be offshore, and with calm winds and higher
humidity, patchy inland fog will be possible. Lows will be in the
upper 60s across most of inland SE GA, and lower 70s elsewhere
tonight.

&&

.SHORT TERM...
(Thursday through Friday night)
Issued at 152 PM EDT Wed Sep 18 2024

Thursday, the surface front will edge southward across NE FL
through the day and interact with diurnal instability and sea
breezes to produce scattered showers and isolated storms mainly
across NE FL, with a another area of rain chances (20%) across
coastal SE GA in the afternoon under a drier and more stable NNW
flow aloft. Friday, steering flow transitions to NE with drier air
limiting shower and thunderstorm coverage. Continued with a low
chance 20% chance of showers and isolated storms across the NE FL
St. Johns River Basin mainly during the afternoon as surface winds
become northeast and breezy near the coast. Patchy inland late
night fog is possible both nights. Temperatures will trend near
normal values with highs in the mid to upper 80s and lows in the
upper 60s to low 70s.

&&

.LONG TERM...
(Saturday through next Wednesday)
Issued at 152 PM EDT Wed Sep 18 2024

Breezy northeast to east winds return this weekend with surface
fronts south of the region and high pressure to the northeast.
This regime will bring coastal showers onshore, with some
expansion with diurnal heating across inland NE FL in the
afternoon. Although localized heavy rainfall could cause a return
of flooding issues, weekend showers appear more transient with
less deep available moisture compared to last week`s coastal
deluges. With the return of breezy onshore flow, hazardous surf
zones conditions develop once again with a high rip current risk
and minor tidal flooding for our coastal communities and moderate
river flooding potential within the St. Johns River basin. The
strength of ENE winds weaken Monday into Tuesday as the surface
ridge center edges southward and weakens coastal convergence, but
a coastal trough with increased moisture returns Tuesday into
Wednesday with a return of morning coastal showers expanding
inland into the afternoon with isolated thunderstorm potential.
Temperatures will trend near to just below seasonal values.

The tropics are expected to become more active next week, with a
tropical system possibly forming in the southern Gulf of Mexico
and drifting northward. Use this weekend to restock supply kits,
review family evacuation plans and considering some shelter
maintenance like trimming trees. Monitor official tropical
forecasts from the National Hurricane Center at hurricanes.gov and
local emergency management officials.

&&

.AVIATION...
(00Z TAFS)
Issued at 744 PM EDT Wed Sep 18 2024

The 00Z TAF period will trend from VFR to MVFR/IFR ceilings after
06-09Z as patchy fog and low stratus clouds develop inland ahead of
a southward moving cold front over southern Georgia, then lifts
after sunrise Thursday. Light and variable winds around 3-5 knots
turn calm at away from the coast through sunrise. A weak cold
front will drift southeast through the area early Thursday with
light northwest winds 3-5 knots as weak high pressure settles to
the northwest of the region with a weak Atlantic seabreeze and the
front generating scattered showers near GNV and SGJ. Winds will
shift to easterly at the coast and duval TAF sites 17-20Z to about
5-8 knots.

&&

.MARINE...
Issued at 152 PM EDT Wed Sep 18 2024

A weak frontal boundary and pressure pattern will linger over the
region through the middle of the week. The sea breeze returns
with afternoon wind shifts to onshore for the nearshore waters
through Thursday. A frontal passage is expected late this week
with high pressure building down the eastern seaboard by this
weekend. This will lead to an increase in Northeast winds by
Friday and into the weekend with Small Craft Advisory headlines
possible.

Rip Currents: Moderate rip current risk for NE FL and SE GA
beaches continues Thursday.

&&

.HYDROLOGY...
Issued at 355 AM EDT Wed Sep 18 2024

Have expired the Coastal Flood advisories along most of the NE FL
Atlantic coast and downgraded Duval county to an advisory with
lighter onshore winds anticipated for this afternoon. Lingering
trapped tides and higher astronomical tides will continue minor
to moderate coastal flooding within the St. Johns through at least
mid-week. The moderate flooding will be mainly confined to areas
south of Jacksonville. The higher tides with this full moon cycle
will continue into September 26th with the peak levels between
Sept. 19th and 21st. Will likely need to reissue a Coastal Flood
Advisory along the Atlantic coast for Friday into the weekend with
the high tides and a surge of northeasterly winds.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  68  88  67  87 /  30  20   0   0
SSI  71  85  72  83 /  10  10   0  10
JAX  71  88  71  87 /  30  20   0  10
SGJ  73  88  73  86 /  40  20  10  20
GNV  70  90  69  89 /  20  30   0  20
OCF  71  91  71  90 /  10  40   0  20

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...Coastal Flood Warning until 5 AM EDT Friday for FLZ033-038-132-
     137.

     Coastal Flood Advisory until 5 AM EDT Friday for FLZ125-225-325.

GA...None.
AM...None.
&&

$$