327
FXUS62 KJAX 141914
AFDJAX

Area Forecast Discussion
National Weather Service Jacksonville FL
314 PM EDT Tue May 14 2024

...STRONG TO ISOLATED SEVERE STORMS EXPECTED TO DEVELOP OVER
NORTHEAST FL OVERNIGHT...
...HEAVY DOWNPOURS EXPECTED THROUGH WEDNESDAY MORNING FOR
LOCATIONS ALONG AND SOUTH OF INTERSTATE 10...
...NEXT FRONTAL BOUNDARY IMPACTS OUR REGION THIS WEEKEND...

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

.SYNOPSIS...
Issued at 314 PM EDT Tue May 14 2024

Afternoon surface analysis depicts a warm front lifting northward
through the Carolinas and north GA, with a wavy cold front
extending from north to south across the Tennessee and Lower
Mississippi Valleys. Aloft...closed upper troughing centered
over the Mid-Mississippi Valley was moving slowly eastward, with
ridging centered over Cuba and the northwestern Caribbean Sea. This
weather pattern was creating deep southwesterly flow across our
area, with this flow propelling the shortwave trough and
associated weakening Mesoscale Convective System (MCS) that
impacted our area earlier this morning offshore and east of Cape
Canaveral this afternoon, with another MCS moving eastward across
the east central Gulf of Mexico, or south of the FL panhandle
coast, this afternoon. Subsidence in the wake of the departing MCS
was allowing for filtered sunshine to overspread our area this
afternoon from west to east, as thick debris cirrostratus cloud
cover along the I-95 corridor thins out as convection moves
further away from our area. Breezy south-southwesterly winds
prevail across northeast and north central FL in the wake of the
MCS, with lighter winds for locations north of Interstate 10.
Temperatures at 19Z were generally in the 80s area-wide, except
upper 70s beneath the thicker departing cirrostratus across
coastal Flagler County. Dewpoints were mostly in the upper 60s and
lower 70s throughout our region.

&&

.NEAR TERM...
(through Tonight)
Issued at 314 PM EDT Tue May 14 2024

Subsidence in the wake of the departing MCS should keep a lid on
convective activity across our region through the evening hours,
with a few showers possibly developing towards midnight ahead of
the next developing MCS that is expected to impact our region
overnight. This next MCS will be aided by a 90-knot jet streak at
250 millibars (around 35,000 feet) that will be developing at the
base of the trough that will be digging into the Tennessee Valley
overnight, which will also force a 40-50 knot low level
southwesterly low level jet around 850 millibars (around 5,000
feet) that will become aligned along the Interstate 10 corridor
towards sunrise. The digging trough will push a cold front
eastward across the FL panhandle overnight. Increasingly
divergent flow aloft as a result of strengthening winds aloft
should create an expanding area of convection along or just
north of the Interstate 10 corridor just after midnight tonight,
with an increasing potential for strong to isolated severe
thunderstorms expected during the overnight and predawn hours,
mainly across northeast FL.

Heavy downpours may extend into coastal southeast GA during the
overnight and predawn hours before convection begins a
southeastward push towards sunrise on Wednesday. The main threats
with strong to isolated severe convection overnight will be
downburst winds of 40-60 mph and hail, and an isolated tornado
cannot be ruled out, especially for locations south of I-10.
Widespread 1-2 inch rainfall totals will be possible by sunrise
for coastal southeast GA and the I-10 corridor before activity
shifts south of I-10 after sunrise. Lows tonight will only fall to
the upper 60s across inland southeast GA and lower 70s elsewhere.

&&

.SHORT TERM...
(Wednesday through Thursday night)
Issued at 314 PM EDT Tue May 14 2024

The active weather pattern continues through Wednesday, with
another round expected overnight tonight and through Wednesday
afternoon. Strong to isolated severe potential will be highest in
the morning south of I-10 with the primary hazards being gusty
winds, locally heavy rainfall, and isolated tornadoes. By early
afternoon, the bulk of the storms will be offshore/south of the
area, with lingering isolated thunderstorms possible through the
afternoon over north central FL. High temperatures will trend near
normal Wednesday, reaching the mid to upper 80s area-wide.

A brief break in this wet pattern is expected for Thursday as the
front sits just south of the area over central Florida. Clear
skies will allow for good daytime heating with highs reaching to
upper 80s to lower 90s. Beachside will be able to heat up into the
upper 80s/near 90 as well due to elevated west/northwest winds
preventing an east coast sea breeze from moving far inland.

&&

.LONG TERM...
(Friday through next Tuesday)
Issued at 314 PM EDT Tue May 14 2024

Precipitation chances will return Friday afternoon/evening and
last through Monday as the front lifts northward Friday,
followed by a trialing cold front incoming from the northwest this
weekend. The highest rain chances will be on Saturday ahead of
the frontal passage, numerous showers and isolated thunderstorms
are forecast. More uncertainty in the forecast comes on Sunday and
Monday, depending on where the front`s position is, for now
scattered rain and thunderstorm chances are in the forecast both
days. High temperatures will range from the mid 80s to lower 90s
each day during this period, with mild lows in the mid 60s to
lower 70s.

&&

.AVIATION...
(18Z TAFS)
Issued at 138 PM EDT Tue May 14 2024

We will see a respite from rainfall through 06z with VFR
conditions and south-southwest winds of 8 to 12 knots with
some higher afternoon gusts to 15-18 knots. Two more rounds of
convection are anticipated for the area terminals. The first round
will commence between 06-08z with a line of convection moving
through the region until 12z. Any storms can produce strong winds
of 35-45 knots and brief IFR cigs and vsby. Shortly after
sunrise, between 12-14z, a potential second round of showers and
storms are forecast to move through the region moving along a slow
moving cold front with some of the stronger storms containing
gusty winds and heavy rain which can cause IFR cigs and vsbys for
area terminals. During the nocturnal hours winds will be out of
the west-southwest at 6 to 9 knots, and then increasing ahead of
the front after sunrise at 10 to 15 knots with some higher gusts.

&&

.MARINE...
Issued at 314 PM EDT Tue May 14 2024

Southwesterly winds will strengthen overnight ahead of an
approaching cold front, with widespread showers and the potential
for strong to severe thunderstorms expected developing over our
local waters after midnight. Strong to severe thunderstorms will
be capable of producing damaging wind gusts, hail and waterspouts
late tonight and Wednesday morning. Activity will then shift
southeastward late on Wednesday morning as the frontal boundary
shifts southward. Outside of thunderstorm activity, winds will
increase to Caution levels of 15-20 knots throughout our local
waters by Wednesday morning, with Caution conditions continuing
offshore on Wednesday night. Seas of 3-5 feet are expected both
nearshore and offshore through Wednesday.

Conditions will improve from north to south on Wednesday
afternoon and evening as the frontal boundary shifts southward,
with breezy westerly winds expected outside of thunderstorm
activity that will gradually subside by Thursday afternoon as weak
high pressure settles over the southeastern states. Seas will
remain in the 3-5 foot range offshore on Wednesday night, with
near shore seas subsiding to 2-4 feet. Winds will then shift to
southerly on Friday ahead of the next frontal boundary that will
impact our area this weekend. Showers and thunderstorms will
likely impact our local waters from Saturday afternoon through
Sunday morning, with a few strong storms possible. Winds will then
shift to northwesterly by Sunday afternoon and night as this
front pushes offshore. Seas of 2-4 feet are expected throughout
our local waters from Thursday through the upcoming weekend.

Rip Currents: A southeasterly ocean swell and choppy surf
conditions will keep a lower end moderate risk in place at area
beaches through Wednesday. Light prevailing offshore winds should
result in a low risk by Thursday.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  68  86  65  88 /  50  10   0   0
SSI  72  86  69  86 /  60  40   0   0
JAX  71  87  67  90 /  80  50   0   0
SGJ  72  86  69  90 /  80  70   0   0
GNV  71  85  67  89 /  80  70   0   0
OCF  72  84  67  89 /  70  80   0   0

&&

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

$$