Clermont, Florida Weather Forecast Discussion

378
FXUS62 KMLB 151050
AFDMLB
Area Forecast Discussion
National Weather Service Melbourne FL
650 AM EDT Mon Sep 15 2025
...New AVIATION...
.KEY MESSAGES...
Issued at 215 AM EDT Mon Sep 15 2025
- A high risk of life-threatening rip currents exists at area
  beaches today, entering the water is discouraged
- Low rain chances through Tuesday, coverage gradually increases
  from south to north mid to late week; locally heavy rainfall
  possible across the Treasure Coast Thursday and Friday
- Temperatures remain near to slightly below normal this week,
  especially across the south, where higher coverage of clouds and
  rain are forecast
&&
.PREVIOUS DISCUSSION...
Issued at 215 AM EDT Mon Sep 15 2025
Today-Tonight...Early this morning, a low pressure system is
situated over the Atlantic, east of the Carolinas. A weak surface
boundary extends southwestward from the low, remaining nearly
stationary over the Bahamas and Florida Straits. 500mb RAP analysis
indicates a broad area of low pressure extending from northeast
Florida to the Outer Banks. Drier air, closer to the 10th-25th
percentile for this point in September, is in place over much of
central and northern Florida. Dew points have fallen into the 60s,
so temperatures in the 70s do not feel quite as muggy stepping out
the door.
Temperatures are forecast to climb back toward mid-September normals
(upper 80s/near 90) this afternoon under a partly cloudy sky.
Forecast soundings stay rather dry but show a very modest increase
in moisture around 850mb later in the day. Thus, isolated showers
are possible, mainly from Orlando southward. Marginally supportive
MLCAPE values will be pinned along the coast (Melbourne southward)
and around Lake Okeechobee, so a slight chance for a storm should
stay confined to those locations. For many, it will be a dry and
seasonably warm day, followed by temperatures in the 70s tonight
(upper 60s north of I-4).
Tuesday-Wednesday...A mid-upper level low is cut off from the
northern stream by mid week and is gradually absorbed into an
upstream trough by late Wednesday into Thursday. Until then, its
surface low reflection over the Atlantic will continue north-
northwestward, eventually moving onshore near the North Carolina and
southeast Virginia coast. By Wednesday, this low center (well north
of the local area) is progged to help re-establish/bring a surface
boundary northward over the Florida Peninsula. Onshore flow persists
as a little more moisture spreads northward, mainly Wednesday and
beyond. Tuesday`s rain chances look similar to today`s, with the
focus for isolated to scattered showers from Osceola/southern
Brevard County southward (limited thunder). Guidance depicts a
moisture gradient centered over the area Wednesday (PW 1.4" north to
2"+ south). Any threat for locally heavy rainfall will likely be
confined to southern Martin County and points south Wednesday
afternoon. Forecast highs trend near to slightly below normal
Tuesday with below normal temperatures (mid 80s) Wednesday across
Okeechobee County and much of the immediate coast.
Thursday-Sunday...As the H5 Mid Atlantic low dissipates and joins a
deepening trough over the northeast Thursday-Friday, we end up
underneath broad troughing over the Midwest/Tennessee Valley next
weekend. Deep moisture transport looks to be most persistent
southeast of the Orlando area, pooled at times along the quasi-
stationary surface front, with comparably drier air (1.5"-1.7" PW)
situated farther inland and northwest of the boundary. For southern
portions of the Treasure Coast still in D2 (Severe Drought), high
rain chances through at least Thursday and Friday could help put a
dent in drought conditions. Multi-run 24-hour QPF trends across the
EC/EC-AIFS/GFS ensemble suites are focused on heavier rainfall
potential Thursday into early Friday, especially from Fort Pierce
southward to Stuart. NBE 72-hr probabilities of greater than 2"
Wednesday A.M. through Saturday A.M. are around 20-30%, which is
notable at this time range. Despite the dry antecedent conditions,
portions of the Treasure Coast could see enough rain in a short
enough span of time to create localized flooding concerns
(especially Thursday and Friday).
Farther north, forecast rain amounts ranging from a few
hundredths to 1-2" are possible, with higher values focused along
the coast from Cape Canaveral southward. Rain chances will last
into the weekend areawide but the threat for locally heavy
rainfall is a bit more in question due to model discrepancies.
Temperatures during the period will remain near to slightly below
normal, especially where added cloud cover prohibits more
efficient daytime heating.
&&
.MARINE...
Issued at 215 AM EDT Mon Sep 15 2025
North-northeasterly flow becomes more east-northeasterly mid to late
week. Wind speeds generally 10-12 kt thru Wed. (locally 15 kt at the
coast) increase up to 15 kt across the waters Thu. and Fri. Boating
conditions remain poor today (small craft should exercise caution)
over the Gulf Stream due to 6 ft waves, but gradual improvements are
forecast by Tue. Wave heights generally remain 3-5 ft Tue.,
decreasing to 2-4 ft Wed.-Fri. Low rain chances will be largely
confined to the Gulf Stream and southern Treasure Coast waters
through Wednesday until deeper moisture brings higher rain and
isolated lightning storm chances late week.
&&
.AVIATION...
(12Z TAFs)
Issued at 650 AM EDT Mon Sep 15 2025
Mainly VFR today into tonight. Afternoon/evening shower and storm
chances will be below normal today (~20-30% near to southeast of the
I-4 corridor) due to a drier airmass in place across the area. Have
maintained VCSH for KMLB/KVRB/KFPR from 17-00Z, and VCTS at KSUA
from 18Z-00Z where storm chances are a little higher. Rain chances
remain too low to include any tempo groups for this activity at this
time. Mostly dry conditions then forecast overnight tonight. Light
northerly winds around 5 knots this morning will become E/NE and
increase to 9-13 knots this afternoon behind the inland moving east
coast sea breeze boundary.
&&
.PRELIMINARY POINT TEMPS/POPS...
DAB  85  71  84  71 /  10  10  10   0
MCO  89  70  90  71 /  20  10  10   0
MLB  86  75  86  75 /  20  20  10  10
VRB  88  74  87  73 /  20  20  20  20
LEE  88  68  88  70 /  10   0  10   0
SFB  88  69  88  70 /  20  10  10   0
ORL  89  70  89  72 /  20  10  10   0
FPR  87  72  87  73 /  20  20  30  20
&&
.MLB WATCHES/WARNINGS/ADVISORIES...
FL...None.
AM...None.
&&
$$
DISCUSSION...Schaper
AVIATION...Weitlich

NWS MLB Office Area Forecast Discussion