651
FXUS62 KMLB 170640
AFDMLB

Area Forecast Discussion
National Weather Service Melbourne FL
240 AM EDT Mon Aug 17 2026

...New KEY MESSAGES, DISCUSSION, MARINE, CLIMATE...

.KEY MESSAGES...
Issued at 240 AM EDT Mon Aug 17 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!

- Heat concerns persist across east central Florida through mid-
  week due to above-normal afternoon highs and peak heat indices
  nearing or reaching Heat Advisory criteria.

- A tight moisture gradient today will lead to higher rain chances
  across the north, with increasing moisture areawide from Tuesday
  onward supporting a return to near-normal rain and storm chances
  across east central Florida.

&&

.DISCUSSION...
Issued at 240 AM EDT Mon Aug 17 2026

Today-Tonight...Broad mid-level ridging persists across the area
while at the surface, the Atlantic ridge axis drifts southwards as
a weakening frontal boundary sags south across the southeastern
US. Locally, this will result in weak offshore flow both at the
surface and aloft, though the development of the east coast sea
breeze later this afternoon will result in winds along the coast
becoming more south to southeasterly. A sharp gradient of moisture
is forecast across the area today, with moisture out ahead of the
frontal boundary pushing towards northern portions of the
forecast area while drier air remains in place southward. This
will result in better rain chances from Kissimmee to Cape
Canaveral and areas northward with PoPs ranging from 20-50%. Storm
development will be possible today with this activity thanks to
sufficient daytime heating, modest low-level lapse rates, and dry
air aloft supporting greater downdraft potential. Storm hazards
today will include wind gusts up to 55 mph, frequent lightning
strikes, and heavy downpours. Westerly flow aloft will keep
activity pushing eastward through today, with showers and storms
eventually moving offshore through the evening and overnight
hours. Drier conditions are forecast overnight with a return to
the prevailing light westerly flow areawide.

Afternoon temperatures will continue to climb into the mid to
upper 90s across east central Florida, with showers and storms up
north providing some relief from the heat late afternoon and into
this evening. Regardless, the heat continues to be a concern as
peak heat indices reach well into the triple digits, with yet
another Heat Advisory in effect for all ten east central Florida
counties between 10 AM and 8 PM. Adequate hydration and breaks in
the shade or an air conditioned building will be crucial for those
spending extended periods of time outdoors. Residents and
visitors alike are encouraged to practice heat safety to help
avoid developing heat illness. Muggy conditions continue through
the overnight hours will temperatures only falling into the mid
70s to low 80s.

Tuesday-Sunday...The mid-level ridging will continue to broaden
through this week as a series of shortwaves travels around the
base of a trough situated across the eastern US. The trough is
then forecast to deepen and expand farther south towards this
weekend. At the surface, the Atlantic ridge axis will remain well
south of the Florida peninsula, maintaining persistent offshore
flow locally through this week. A return of diurnally-driven
showers and storms is anticipated across east central Florida as
the plume of moisture expands southwards and keeps the area within
a moist airmass through this week. Rain chances return closer to
normal values, with PoPs ranging between 40-60% each afternoon.
Any storms that manage to develop will be capable of producing
lightning, gusty winds, and heavy downpours, with activity
forecast to push offshore due to the persistent westerly flow.
Temperatures and the heat will also remain a focus through this
week, with hot conditions persisting through at least Wednesday.
Additional Heat Advisories for portions of the area cannot be
ruled out. Towards the end of this week, thanks to the greater
rain chances and moisture, temperatures are anticipated to trend
slightly closer towards normal.

&&

.MARINE...
Issued at 240 AM EDT Mon Aug 17 2026

The Atlantic ridge axis slowly shifts southward today and through
the rest of this week, with an approaching frontal boundary
bringing increasing moisture locally as it stalls and washes out
across north Florida. Offshore-moving shower and storm chances
increase starting today north of Cape Canaveral but will expand to
include all of the waters from Tuesday onward. Storms will be
capable of producing lightning strikes, wind gusts in excess of 30
knots, heavy downpours, and locally higher seas. Outside of
showers and storms, generally favorable boating conditions are
anticipated through this week. West to southwest winds of 5 to 10
knots will persist, becoming more south to southeast each
afternoon as the east coast sea breeze develops. Seas remain
between 1 to 2 feet, with occasional 3 foot seas across the
offshore waters.

&&

.AVIATION...
(06Z TAFs)
Issued at 1255 AM EDT Mon Aug 17 2026

Continued mainly VFR through the TAF period. Dry conditions and
light WRLY winds into morning hours. Low-level flow a bit
stronger WRLY than the previous day and expect the ECSB could be
delayed (esp TIX north) on top of not making it toward the
interior terminals today. Winds becoming E/SE 8-10 mph where sea
breeze passes, else 6-10 mph further west (inland). Higher
moisture values northward, thus only have VCTS mention near MLB
northward this afternoon/early eve as some CAMs showing a few
lightning storms this far south. Potential TEMPO groups later as
confidence allows with MVFR in storms. Interior terminals will
rely on surface heating/WCSB for aftn convective chances. Boundary
collisions early this evening across the eastern peninsula closer
toward the coast. Still mainly lower than normal TSRA/SHRA
chances overall. Generally quiet conditions resuming mid/late
evening thru the overnight.

&&

.CLIMATE...
Issued at 240 AM EDT Mon Aug 17 2026

Record high temperatures at local climate sites today:

Site          Aug 17
Daytona     96  (1990)
Leesburg    98  (2005)
Sanford     97  (2005)
Orlando     99  (1929)
Melbourne   97  (2022)
Vero Beach  98  (2022)
Fort Pierce 97  (2022)

&&

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

&&

.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