Port St. Lucie, Florida 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

529
FXUS62 KMLB 141857
AFDMLB

Area Forecast Discussion
National Weather Service Melbourne FL
257 PM EDT Sun Jun 14 2026

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

.KEY MESSAGES...
Issued at 257 PM EDT Sun Jun 14 2026

- Scattered to locally numerous afternoon and evening showers and
  lightning storms will persist into this week. A few strong
  storms will be possible each day, producing frequent lightning
  strikes, gusty winds up to 40-50 mph, and locally heavy rainfall
  from slow-moving storms.

- Hot and humid conditions will lead to heat indices 100-107 and
  a Moderate to Major HeatRisk. Residents and visitors should
  remain well-hydrated and seek breaks in the shade or A/C during
  the heat of the day. For more info about HeatRisk and heat
  safety tips, visit Heat.gov.

- A moderate risk of life-threatening rip currents persists at all
  central Florida Atlantic beaches. Always swim near a lifeguard
  and never enter the water alone!

&&

.DISCUSSION...
Issued at 257 PM EDT Sun Jun 14 2026

Currently-Tonight...Low level offshore flow persists but is
generally weak and should see the east coast sea breeze push
inland near to just west of the I-95 corridor. Already starting to
see some isolated to scattered showers/storms developing across
the area with daytime heating. However, greatest storm coverage
looks to be toward late afternoon/evening, generally near to
southeast of I-4 corridor and near/inland of I-95 where sea
breeze/outflow boundary collisions are favored. Westerly steering
winds decrease through late day, and while some shifts in storms
back to the coast will occur, storm motion may still be slow and
erratic across the area.

Deep moisture (PW 2-2.2") and slow storm motion will lead to
torrential downpours with persistent storms, producing a quick 2-4
inches of rainfall locally in a 60-90 min period. While this will
mostly produce minor flooding issues, there may be an isolated spot
or two that sees totals between 4-6 inches, which may lead to a
localized flash flooding threat. Therefore, a Marginal Risk (5-14%)
of excessive rainfall exists across much of east central Florida
this afternoon and evening. 15Z sounding from the Cape shows some
pockets of drier air aloft, which will also support strong gusts to
40-50 mph and frequent lightning from a few stronger storms.
However, as is usual with summer convection, can`t completely rule
localized damaging gusts to 60 mph from a storm or two. Temps at
500mb are around -6 to -7C, which may also lead to isolated reports
of small hail.

Convection diminishes and shifts slowly offshore through late
evening, with drier conditions forecast overnight. Remaining warm
and humid with lows in the mid to upper 70s for much of the area
tonight.

Monday-Wednesday...Subtropical ridge axis continues to remain south
of the area through early to midweek, continuing offshore (W/SW) low
level winds across the area. PW values of 1.8-2.0 inches will remain
sufficient enough to support scattered to locally numerous showers
and storms each afternoon and evening. Should still see the east
coast sea breeze form each afternoon, but the offshore winds should
stall the sea breeze near to just inland of the I-95 corridor, with
greatest coverage of convection focusing toward the coast. This
activity will shift offshore each day, with a few stronger storms
continuing to be possible. Main storm threats will continue to be
strong gusty winds, frequent lightning and locally heavy rainfall
producing minor flooding.

Hot and humid conditions will persist, with highs in the low to mid
90s and peak heat index values reaching 100-107 degrees each day.
Little relief will occur overnight, with lows in the mid to upper
70s. This will all contribute to a Moderate to Major HeatRisk across
the region each day. For more info about HeatRisk and heat safety
tips, visit Heat.gov.

Thursday-Sunday...Mid-level ridge across the western Atlantic will
nudge northwest across Florida through late week before shifting
back south as a passing disturbance aloft crosses the southeastern
United States. At the surface a weak frontal boundary will slide
southward toward north Florida and stall, keeping ridge axis either
near or just south of the region. This will continue to produce
scattered afternoon/evening showers and storms each day, focused
toward the eastern side of the Florida peninsula. Low level winds
may be able to become more southerly into late week allowing the
east coast sea breeze to push a little farther inland and focusing
late day boundary collisions west of I-95. However, an offshore
steering flow will still help push scattered showers/storms back
to the coast and offshore through each evening.

No significant change to the heat into late week and weekend,
with highs still above normal in the low to mid 90s and humid
conditions still producing mostly 100-107 heat index values each
day. This will continue a Moderate to Major HeatRisk each day.

&&

.MARINE...
Issued at 257 PM EDT Sun Jun 14 2026

Mostly favorable boating conditions forecast to continue through the
upcoming work week. Subtropical ridge axis will remain south of the
waters, leading to an offshore flow pattern through at least midweek.
W/SW winds in the morning will become S/SE into the afternoon and
evening as the east coast sea breeze forms and shifts inland each
day. Wind speeds will generally be less than 15 knots, but may
briefly increase to 15-18 knots offshore each evening. Seas will
range from 1-3 feet.

Main concern for boaters will be for scattered offshore moving
storms, primarily from mid afternoon through the evening hours
that will continue to be a threat each day (including through
this evening). Main storm threats will be frequent cloud-to-water
lightning strikes, gusty winds in excess of 34 kts, and
torrential downpours. Winds and seas will be locally higher in the
vicinity of any storms.

&&

.AVIATION...
(18Z TAFs)
Issued at 138 PM EDT Sun Jun 14 2026

East coast sea breeze has developed, but offshore (WSW-SW) flow
5-10 kts is slowing the inland push along the Space and Treasure
Coasts, and pinning the boundary to the coast to the north. Winds
will be shifty at KTIX-KSUA before becoming onshore (SSE-SE) 5-10
kts. ISO SHRA have developed INVOF of KVRB-KFPR, and a few SHRA
ongoing here and there across the rest of ECFL. Low confidence in
convective evolution this afternoon-evening as chaotic storm
boundaries will have a significant influence in TS development.
General trends are for TSRA/SHRA to gradually increase in
coverage, with highest coverage along the sea breeze collision
near the coastal corridor, then gradually shift offshore. Chances
at KMCO-KSFB high enough to continue TEMPOs. Have also added
TEMPOs for Treasure Coast terminals, and PROB30 for KMLB. TS
expected to dissipate after 02Z, but could linger as late as
midnight. Quiet overnight once TS dissipates or moves offshore.
Rinse repeat Monday as offshore flow favors a sea breeze collision
and high TS chances on the eastern side of the peninsula.

&&

.PRELIMINARY POINT TEMPS/POPS...
DAB  77  92  77  92 /  60  60  30  50
MCO  76  93  76  93 /  40  40  20  50
MLB  77  93  77  93 /  60  60  40  60
VRB  75  93  75  93 /  50  60  40  60
LEE  78  91  77  92 /  20  30  10  30
SFB  77  93  77  94 /  50  50  20  50
ORL  77  92  77  93 /  40  40  20  50
FPR  75  92  74  92 /  40  60  30  60

&&

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

$$

DISCUSSION...Weitlich
AVIATION...Haley