443
FXUS62 KMLB 181039
AFDMLB

Area Forecast Discussion
National Weather Service Melbourne FL
639 AM EDT Tue Aug 18 2026

...New AVIATION...

.KEY MESSAGES...
Issued at 255 AM EDT Tue Aug 18 2026

- A Heat Advisory is in effect for all east central Florida
  counties between 10 AM and 8 PM for peak heat indices of 108F to
  112F. Practice heat safety!

- An active weather pattern is forecast through this week, with
  daily afternoon showers and thunderstorms anticipated across
  east central Florida.

- Hot conditions will continue over the next couple of days with
  temperatures trending closer to normal late this week.

&&

.DISCUSSION...
Issued at 255 AM EDT Tue Aug 18 2026

Today-Tonight...Surface high pressure will remain just south of
the Florida peninsula today, allowing for the continued spread
southward of a moist air mass. Westerly flow prevails both at the
surface and aloft, resulting in a delayed development of the east
coast sea breeze. The sea breeze will struggle to push inland,
with guidance suggesting it should move just past the I-95
corridor. With the moist air mass overhead causing PWATs to exceed
2" areawide, a return of scattered shower and storm chances is
anticipated across east central Florida today, with timing following
the diurnal pattern driven by the sea breezes. Activity will
increase this afternoon, with westerly flow aloft supporting
offshore-moving showers and storms through late afternoon into
the evening hours. Sufficient instability from daytime heating and
modest low-level lapse rates supporting vertical growth, dry air
above 800 mb enhancing downdraft potential, and PWATs exceeding 2"
areawide will support isolated strong storm development across
the area today. Storm hazards will include frequent lightning
strikes, wind gusts of 45 to 55 mph, and heavy downpours with the
potential for quick rainfall accumulations of 1-3" in some spots.
Minor, localized flooding cannot be ruled out, especially along
the coast. There is a low chance for some broad rotation as well
along the sea breeze, with a brief funnel cloud or two not able to
be fully ruled out. Activity wanes into the evening and overnight
hours across the peninsula, with a return of prevailing light
westerly flow and mostly dry conditions.

Hot conditions will persist across east central Florida today,
with mostly clear skies through the morning hours supporting
effective daytime heating. Afternoon highs will continue to climb
into the mid 90s areawide, remaining above normal values. Humid
conditions in addition to the highs will result in peak heat
indices of 108F to 112F, with another Heat Advisory issued across
all ten east central Florida counties between 10 AM and 8 PM.
Residents and visitors alike are encouraged to practice heat
safety, remain adequately hydrated, and avoid spending extended
periods of time in the heat. Limited relief overnight from the
muggy conditions, with lows only falling into the mid 70s to low
80s.

Wednesday-Monday...An active pattern will continue across east
central Florida through this week and into early next week. Mid-
level ridging will weaken across the Florida peninsula, with
guidance now favoring a mid-level low developing across the Gulf
and lifting across north Florida mid to late week. This low would
be absorbed by a trough digging southward across the eastern US
this weekend. At the surface, this mid-level pattern would support
persistent increasing moisture locally, with a series of decaying
frontal boundaries anticipated to approach Florida through late
this week while broad high pressure remains situated across the
Gulf. Locally, west to southwest winds are forecast to continue
areawide, with daytime heating supporting the development of the
east coast sea breeze each day. The push inland during the
afternoon hours will result in winds becoming more south to
southeasterly behind it, with westerly winds aloft preventing too
much intrusion inland. Combined with the moist air mass in place,
a diurnal pattern of showers and storms will persist, with
development driven primarily by the sea breezes each day. Rain
and storm chances will remain near normal (40-60%) through the
period, with storm hazards including lightning strikes, gusty
winds, and heavy downpours that have the potential to produce
minor, localized flooding in some spots. With steering flow
remaining out of the west, activity will push offshore through the
afternoon and evening hours each day, with mostly dry conditions
anticipated across the peninsula through the overnight hours.

Temperatures are forecast to remain above normal over the next
couple of days, though the persistent moist pattern will lead to a
trend closer to normal late this week and into the weekend. The
heat will still remain a concern through this week as peak heat
indices climb well into triple digits, with continued support from
guidance that some locations across east central Florida may near
and even exceed Heat Advisory thresholds. This will continue to
be closely monitored and additional heat products will be issued
as needed.

&&

.MARINE...
Issued at 255 AM EDT Tue Aug 18 2026

The Atlantic ridge axis will remain south of the waters through
most of this week, with boating conditions anticipated to remain
generally favorable. West to southwest winds each day become more
south to southeasterly during the afternoon hours as the east
coast sea breeze develops, with wind speeds around 10 knots
anticipated. Seas of 1 to 3 feet persist, highest across the
offshore waters.

Offshore-moving showers and storms are forecast across the local
waters through this week, primarily during the evening hours. Any
storms that develop will be capable of producing lightning
strikes, wind gusts exceeding 30 knots, heavy downpours, and
locally higher seas. Continued isolated development across the
Gulf Stream waters during the overnight hours can`t be ruled out,
but confidence in this remains low.

&&

.AVIATION...
(12Z TAFs)
Issued at 601 AM EDT Tue Aug 18 2026

Continued mainly VFR through the TAF period. Dry conditions and
light WRLY winds thru the morning hours. Low-level WRLY flow, again,
will keep the ECSB (delayed) pinned near the coast, where it is
able to develop later this afternoon. Winds becoming E/SE 8-10 kts
where sea breeze passes, else WRLY winds 8-12 kts further inland
with some higher afternoon gusts. Higher moisture values continue
northward and PoPs will be highest across the I-4 corridor and
toward the Volusia/Brevard coasts later in the day/early evening
where a sea breeze collision will occur. TEMPO groups later as
confidence allows with generally MVFR in storms. Interior
terminals will rely on surface heating/WCSB for aftn convective
chances. Entrainment of dry air, however, may allow for elevated
DCAPE values to be realized in terms of strong (local) wind gusts
at the surface in a few storms. Storm motion favors out of the
northwest at 10-15 kts. Generally quiet conditions resuming
mid/late evening thru the overnight with WRLY winds becoming
light.

&&

.PRELIMINARY POINT TEMPS/POPS...
DAB  94  78  94  77 /  50  20  60  10
MCO  97  79  95  78 /  50  20  60  20
MLB  96  79  94  78 /  50  30  50  10
VRB  95  77  94  76 /  40  30  50  10
LEE  95  79  95  78 /  60  20  60  20
SFB  95  79  95  78 /  60  20  70  20
ORL  96  80  95  78 /  50  20  70  20
FPR  95  77  93  76 /  40  30  50  10

&&

.MLB WATCHES/WARNINGS/ADVISORIES...
FL...Heat Advisory from 10 AM this morning to 8 PM EDT this evening
     for FLZ041-044>046-053-058-141-144-154-159-164-247-254-259-
     264-347-447-547-647-747.

AM...None.
&&

$$

DISCUSSION...Tollefsen
AVIATION...Sedlock