Port St. Lucie, Florida 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

217
FXUS62 KMLB 051850
AFDMLB

Area Forecast Discussion
National Weather Service Melbourne FL
250 PM EDT Sat Jul 5 2025

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

.KEY MESSAGES...
Issued at 208 PM EDT Sat Jul 5 2025

- Numerous showers and storms are forecast this weekend. Today,
  frequent lightning and localized flooding are the primary
  hazards. The threat for gusty winds of 40-50 mph increases on
  Sunday.

- High pressure is expected to take hold next week, but seasonably
  ample moisture should continue to spawn scattered storms.

- As temperatures warm back to the lower 90s, tropical humidity
  will make for oppressive peak heat indices of 100 to 105 degrees
  most afternoons.

&&

.DISCUSSION...
Issued at 208 PM EDT Sat Jul 5 2025

Rest of Today-Tonight...A lingering WSW-ENE boundary near the
Orlando area associated with Tropical Storm Chantal generated a
few showers this morning along the I-4 corridor. This feature has
begun generating additional showers and storms early this
afternoon and is forecast to be focal point of convection through
the day by mesoscale models, along with the east coast sea breeze.

High coverage of showers and storms expected through the remainder
of the afternoon and into the evening hours across the forecast
area. PoPs 70-80%, with the highest coverage along the aforementioned
boundary. The main storm threat today will be locally heavy
rainfall. Totals of 2-3+" will be possible, especially near to
just south of the weak boundary, fueled by ample available
moisture. Frequent lightning strikes and gusty winds to 45 mph
will also be possible in the strongest storms. Peak convective
timing is forecast between 4-8 pm today. However, a few storms
will remain possible into the evening hours, especially for
coastal areas from Melbourne southward. Drier conditions are
expected by late evening, which will then continue through the
overnight hours. Tonight, low temperatures in the lower to mid-70s
are forecast.

Sunday-Monday...Tropical Storm Chantal is forecast to move
onshore along the Carolina Sunday morning, before dissipating
over that area into Monday. Meanwhile, the Atlantic ridge axis
will build slowly northward through the Straits of Florida through
the period, reaching the Lake Okeechobee region Monday night.
With the ridge axis remaining south of the area, southwesterly
flow will prevail, limiting the inland progression of or even
pinning the east coast sea breeze. Therefore, the eastern half of
the peninsula will be favored for afternoon and evening showers
and storms. PoPs 60-70% continue for Sunday, though slightly drier
air Monday is expected to keep PoPs nearer to normal (30-50%). A
few gusts up to around 50 mph will be possible, as DCAPE and
boundary layer flow increase compared to previous days. Storm
motions look to remain fairly limited, with locally heavy rainfall
remaining a possibility. High temperatures in the lower 90s and
humid conditions will combine to produce peak heat indices 100-105
degrees. Use caution if spending time outside, stay well
hydrated, and take adequate breaks in the shade or A/C.

Tuesday-Saturday...The Atlantic ridge axis settles in over the
central Florida peninsula, where it will remain through at least the
end of the work week. Whether this feature resides over or just
south of the forecast area will dictate the location of the sea
breeze collision each day. However, it does appear the central and
eastern portions of the peninsula would be favored, at this time.
Should the ridge axis drift southward, higher coverage of showers
and storms would be expected. Typical early July moisture is also
forecast, with PWATs 1.7-2". Thus, have maintained a climatological
normal PoP of 50-60% each afternoon. High temperatures are expected
to remain in the upper 80s to lower 90s.

&&

.MARINE...
Issued at 208 PM EDT Sat Jul 5 2025

Tropical Storm Chantal remains northeast of the local Atlantic
waters this afternoon and is forecast to move onshore along the
Carolina coast Sunday morning. Limited impacts to the east central
Florida waters are expected from this system, mainly in an
increase in seas up to 5 feet well offshore. In addition, a
stalled boundary near Cape Canaveral is producing north-
northwesterly winds to the north of the boundary, while south to
southwesterly winds prevail elsewhere, though these winds have
been limited to 10-15 kts. However, small craft should exercise
caution this evening across the offshore Treasure Coast waters, as
southwest winds briefly increase to 15-20 kts before diminishing
again overnight.

High pressure is forecast to build into the area early next week,
improving boating conditions. South to southwest winds prevail,
remaining around 15 kts or less. This will lead to an increase in
offshore-moving showers and storms, though coverage is forecast to
become near-normal, as opposed to the above normal coverage of the
last several days. Seas 2-4ft through Sunday diminish to 1-2 ft
early in the week.

&&

.AVIATION...
(18Z TAFs)
Issued at 158 PM EDT Sat Jul 5 2025

MVFR cloud bases observed across the area this morning have
mostly lifted above VFR this afternoon. High coverage of showers
and storms is forecast across east central Florida again today.
TEMPOs remain across the Orlando area terminals from 20/23Z when
peak TSRA impacts are forecast to occur. A weak sea breeze is
developing from Brevard county southward and have included TEMPOs
from 18/21Z at TIX/MLB/VRB/FPR for convection near and along the
sea breeze. Coverage of showers and storms gradually diminishes
after sunset, drying across much of the area near or before 03Z.
Winds may become variable at times with the presence of many
mesoscale boundaries, but prevailing winds are expected to remain
10 kts or less. Will monitor trends for low CIGs across the
interior again tonight, but the current TAF remains VFR.

&&

.PRELIMINARY POINT TEMPS/POPS...
DAB  74  90  74  91 /  30  60  10  40
MCO  74  90  75  92 /  50  70  10  50
MLB  74  90  75  91 /  50  60  20  40
VRB  72  92  71  91 /  30  60  20  30
LEE  75  89  76  91 /  50  70  10  50
SFB  74  91  76  93 /  40  70  10  50
ORL  75  90  76  92 /  50  70  10  50
FPR  72  91  71  91 /  30  60  20  30

&&

.MLB WATCHES/WARNINGS/ADVISORIES...
FL...None.
AM...None.
&&

$$

DISCUSSION...Leahy
AVIATION...Law