066
FXUS62 KJAX 230131
AFDJAX

Area Forecast Discussion
National Weather Service Jacksonville FL
931 PM EDT Sat Jun 22 2024

...New UPDATE...

.UPDATE...
Issued at 930 PM EDT Sat Jun 22 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

Some T`storms continue to off the coast, near St Augustine, and
over portions of the Suwannee river valley, but should fade by
midnight with scattered to broken mid level clouds lingering
until near sunrise while showers hang near the coast through
much of the night. Light southerly winds expected to turn near
calm late tonight as the remnants of a weak low spiral north of
the Altamaha river near the GA coast. Not expecting fog. Lows
will be muggy again in the mid 70s inland and the upper 70s to
around 80 at the coast. Highs Saturday will rise into the upper
80s along the immediate coast.

Near tropical airmass levels (1.8 to 2.0 inches of Precipitable
Water), strong diurnal heating, and lift from the inland moving
seabreezes will create scattered to numerous thunderstorms Sunday
with locally gusty convective winds 40-50 mph and locally heavy
rainfall amounts possible. Highs will be hotter with low 90s at
the coast and mid 90s farther inland west of highway 301. Winds
will be SE behind the Atlantic seabreeze around 10 mph with some
higher gusts to 15-20 mph along the coast while winds stay south
to southwesterly further inland with the Gulf seabreeze lifting to
I-75 by late afternoon.

&&

.NEAR TERM...
Issued at 119 PM EDT Sat Jun 22 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

Drier air on the west side of the low just north of the Altamaha
River in Liberty County have really limited land based convection
with drier continental airmass and subsidence with most
convection being maritime based. This low is forecast to remain
stationary or meander very slowly around the area with a slight
drift to the west for the next 18 hours depending on the model.
Have tempered precipitation chances for the rest of the this
afternoon to mainly to isolated to widely scattered and mainly
east of highway 301.

By late tonight the Bermuda High may slide a bit farther east,
ushering in a light WSW flow. This could lead to more storms in
the morning across the Gulf that drift onshore into the Suwannee
Valley during the pre-dawn hours. With the low in the vicinity of
interior SE GA another convective area may develop toward daybreak
on the east side of the inland low with PWATs between 1.75 to just
over 2 inches.

&&

.SHORT TERM...
(Sunday through Monday night)
Issued at 124 PM Sat Jun 22 2024

An upper trough remains stationary just offshore of the FL/GA
coastline while Bermuda ridge sets up to our east...with
northwest flow aloft over the forecast area with upstream ridging
building in. We will have a predominate W-SW flow regime Sunday
and Monday with an active Gulf flow and sea breeze. On Sunday, the
west coast sea breeze may meet up with east coast seabreeze near
I-95 during the afternoon. On Monday, looks to be more of a
straight forward Gulf of Mexico west seabreeze regime. Both days
there will be scattered to numerous showers and storms with
greatest coverage across NE FL.   Unseasonably hot temperatures are
expected through the short term period with mid/upper level ridging
extending over our area from the west with ridge retrograding
slightly on Monday. 850mb temperatures will rise to 21-22C Sunday
and Monday, likely to translate to above normal high temperatures
in the mid 90s inland, near 90 coast Sunday, with mid-upper 90s
inland Monday, lower 90s coast...a few locations in interior SE GA
could peak just shy or near 100 degrees. Afternoon heat index
values each day will likely be in the 95-105 range.

&&

.LONG TERM...
(Tuesday through next Saturday)
Issued at 119 PM EDT Sat Jun 22 2024

The upper pattern changes little Tuesday until Wednesday Night
and Thursday when an upper trough digs SE toward our forecast
area, With a moist environment in place, and active sea breezes
with above normal inland temps, expecting to see scattered to
numerous showers/storms each afternoon.

Above normal high and low temperatures will continue Tuesday and
Wednesday...with some areas particularly in interior SE GA seeing
high temperatures near 100 degrees.... and with afternoon heat
index values of 100-105 each day. Current consensus guidance
maintains above normal temperatures right through Friday.

&&

.AVIATION...
(00Z TAFS)
Issued at 823 PM EDT Sat Jun 22 2024

The 00Z TAF period will include some MVFR/IFR restrictions for
T`storms near CRG and JAX that should fade by 02Z with VCSH along
the coast north and south of JAX/CRG and at GNV through 06Z.
Light southerly winds tonight will settle to under 5 knots inland
after 06Z and remain 5-10 knots along the coast with VFR ceilings
and clearing mid level clouds late. Sunday, showers along the
coast will move inland and turn to convection with VCTS at all
sites after 18-20Z with PROB30 groups for MVFR restrictions at all
TAF sites Sunday afternoon after 18Z. South to southwesterly
winds 5-8 knots will turn southeasterly behind the Atlantic
seabreeze at SGJ,CRG and southerly at JAX, SSI, and VQQ 17-20Z
8-10 knots.

&&

.MARINE...
Issued at 119 PM EDT Sat Jun 22 2024

High pressure will shift towards Bermuda this weekend with
decreasing winds and seas with a more typical summer sea breeze-
like pattern returning into early next week. Rounds of showers and
thunderstorms will continue to develop over our local waters this
weekend and into next week as prevailing winds become southerly
ahead of a weakening surface trough that will settle over the
southeastern states through midweek.

Rip Currents: Moderate rip current risk today for NE FL and SE GA
beaches as winds shift more southerly.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  73  95  75  98 /  20  40  10  40
SSI  75  91  78  95 /  40  60  20  40
JAX  74  93  75  97 /  40  70  20  50
SGJ  74  92  75  95 /  30  70  30  50
GNV  72  93  73  94 /  30  70  20  70
OCF  75  93  75  94 /  40  70  30  80

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...None.
GA...None.
AM...None.
&&

$$