275
FXUS62 KMLB 171900
AFDMLB

Area Forecast Discussion
National Weather Service Melbourne FL
300 PM EDT Sun May 17 2026

...New KEY MESSAGES, DISCUSSION, MARINE, FIRE WEATHER...

.KEY MESSAGES...
Issued at 300 PM EDT Sun May 17 2026

- Isolated to scattered shower and storm development is forecast
  each afternoon across east central Florida through this week.

- A Moderate HeatRisk is forecast to gradually spread across east
  central Florida through this week due to warm temperatures;
  adequate hydration and breaks from the heat will be important
  for those spending extended periods of time outdoors.

- High risk for life-threatening rip currents continues at ALL
  central Florida Atlantic beaches tonight. Entering the
  dangerous surf is strongly discouraged.

&&

.DISCUSSION...
Issued at 300 PM EDT Sun May 17 2026

Through Tonight...An area of high pressure centered across the
western Atlantic just offshore the Mid-Atlantic and Carolina
coasts will remain in place through the rest of today and into the
overnight hours. This high will help keep a drier air mass in
place from 850 mb to 400 mb as well as persistent onshore flow
across east central Florida. This set-up has allowed for ample
daytime heating today, with values remaining on track to reach the
upper 80s along the coast and the low 90s across the interior. In
some spots, the convective temperature has already been reached
for the day, with some isolated shower and storm activity
developing just northwest of the Orlando metro. Shower and storm
development will continue to be possible through this afternoon,
with the greatest coverage of activity forecast to remain west of
the Orlando metro (20-40% chance), primarily across the far
western portions of Lake, Osceola, Orange, and Okeechobee counties
and outside of the forecast area. Aloft, 500 mb temperatures
remain between -11 to -9C across east central Florida and the dry
layer between 800-450 mb has caused DCAPE to exceed 800 J/kg
across most of the area. Additionally, the ample daytime heating
has resulted in plentiful instability. Moisture remains a limiting
factor for development, with PWATs generally in the 1-1.2" range
based on the latest Total PWAT satellite imagery. If any storm
activity does manage to develop, frequent lightning strikes, wind
gusts to 45 mph, small hail, and brief heavy downpours would be
the primary storm threats. Activity will move westward through the
afternoon and evening hours, with persistent easterly flow aloft
helping to prevent any pushback to the east coast. Showers and
storms are forecast to diminish into the evening hours.

Drier conditions are forecast into the overnight hours across
east central Florida, with onshore flow persisting as the high
remains in place across the western Atlantic. Temperatures
overnight are forecast to fall into the upper 60s to upper 70s,
with the coolest spots being focused near rural portions of east
central Florida. A high risk of rip currents continues at all east
central Florida beaches overnight. Entering the ocean is not
advised, even moreso at night.

Monday-Sunday...High pressure is forecast to stay situated
offshore across the western Atlantic waters through the extended
period. The high is anticipated to weaken and even slide eastward
mid to late week as a frontal boundary approaches and stalls
across the southeastern US Thursday through the end of the week,
but locally, this will result in little change to the persistent
forecast. Onshore flow will remain the dominant flow areawide,
with adequate daytime heating leading to the development and push
inland of a diffuse east coast sea breeze each afternoon. Wind
speeds will be enhanced each afternoon by the sea breeze, reaching
sustained values of 10 to 15 mph at times across the interior and
along the coast. Isolated to scattered shower and storm coverage
is forecast each day, with the highest chances focused primarily
across the interior west of I-95 (30-50%). The persistent onshore
flow will result in increasing moisture across the area, with
guidance indicating a surge of moisture reaching the area into
next weekend. This has led to an uptick in rain chances Saturday
and Sunday (40-60%), but there does remain some level of uncertainty
being so far out in time.

The persistent onshore flow will maintain a similar temperature
pattern to today, with highs in the mid to upper 80s along the
coast and reaching the upper 80s to low 90s across the interior.
Overnight temperatures will remain generally in the 70s, with some
rural locations potentially falling into the upper 60s. Increasing
coverage of Moderate HeatRisk across east central Florida is
forecast through the extended period, so visitors and residents
alike are encouraged to be mindful if spending extended periods of
time outdoors; stay hydrated and take breaks in shaded or air-
conditioned locations.

&&

.MARINE...
Issued at 300 PM EDT Sun May 17 2026

Surface high pressure will remain north of the local Atlantic
waters through the forecast period, resulting in persistent
onshore flow of 10 to 15 knots and seas generally remaining
between 2 to 4 feet. Brief wind surges to 15 to 20 knots may lead
to short periods of poor boating conditions across the offshore
waters through Tuesday with seas reaching 5 feet at times, but
overall, generally favorable boating conditions are anticipated
through a majority of the period.

A diffuse east coast sea breeze is forecast to develop each
afternoon, resulting in wind surges each afternoon along the
intracoastal waterways and along the coast. Isolated to scattered
shower and storm development will be possible along the sea
breeze, though the highest coverage is anticipated to occur
primarily across the Florida peninsula. Persistent onshore flow at
the surface and aloft should help prevent any build-back of
showers and storms towards the local waters into the evening
hours, though conversely the prevailing onshore flow may result in
some isolated to scattered marine shower development through the
overnight and early morning hours.

&&

.AVIATION...
(18Z TAFs)
Issued at 107 PM EDT Sun May 17 2026

Deep ESE flow should hold much of the convection on the western
half of the peninsula this afternoon. Aside from VCTS at LEE, only
isolated showers are forecast this evening. Quiet conds tonight
with continued breezy E/ESE winds on Monday. Few SHRA at FPR/SUA,
esp Monday.

&&

.FIRE WEATHER...
Issued at 300 PM EDT Sun May 17 2026

High pressure will remain situated across the western Atlantic
through this week, resulting in persistent onshore flow across
east central Florida. While this flow will keep moisture well
above critical thresholds, easterly winds of 10 to 15 mph gusting
to 25 mph at times will keep fire weather conditions sensitive
over the next several days. Additionally, the chance of storm
development and specifically the potential for lightning strikes
will lead to an increased concern for new fire sparks.

&&

.PRELIMINARY POINT TEMPS/POPS...
DAB  73  86  74  87 /   0   0  10  20
MCO  71  89  72  89 /  10  10  10  30
MLB  77  86  77  86 /   0  20  20  20
VRB  76  86  76  87 /  10  20  20  30
LEE  71  90  72  90 /  20   0   0  30
SFB  70  89  72  89 /   0   0  10  30
ORL  71  89  73  89 /  10  10   0  30
FPR  75  86  75  86 /  10  30  20  40

&&

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

$$

DISCUSSION...Tollefsen
AVIATION...Heil