910 FXUS62 KMFL 201727 AFDMFLArea Forecast Discussion National Weather Service Miami FL 127 PM EDT Sat Sep 20 2025
...New UPDATE...
.UPDATE... Issued at 126 PM EDT Sat Sep 20 2025
Model and synoptic analyses depict two high pressure centers lingering over the Gulf coast and the E CONUS, while a decaying frontal boundary and attendant low still lingers over the west Atlantic and the Bahamas. Meanwhile, drier air keeps entraining at the mid levels across the state, along with model/sounding PWATs dropping to around 1.2 inches in general across much of the peninsula. This synoptic scenario will translate into lesser chances of rain for the rest of today, with a gradient of POPs from 20 to 40 percent north-to-south. Highest chances remain over the southern tip of the peninsula where the best pool of moisture resides.
The high pressure cells will keep SoFlo under a generally N to NE moderate flow through the rest of the weekend, which will also help in keeping higher chances of showers over the eastern half of SoFlo. The drier air aloft and the lack of dynamic support will keep thunderstorm chances to a minimum, but a couple of thunderstorms near the Atlantic coast are certainly possible, especially later in the afternoon or early evening.
By Sunday, high-res solutions and ensembles agree in having the aforementioned front slowly backtracking into extreme SoFlo, dragging some additional moisture into the area. Thus, POps for Sunday afternoon will modestly increase into the 30-50 percent range, with best chances south of I-75. Coverage should also spread across much of SoFlo as the high pressure ridge to the north migrates closer to the Atlantic seaboard and shifts winds to a more easterly flow. But even so, shower and thunderstorm activity will likely be just slightly higher than today`s.
Warm temps continue across SoFlo with afternoon highs generally around 90 degrees today and Sunday
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.SHORT TERM... (Today through Sunday) Issued at 1252 AM EDT Sat Sep 20 2025
An overall pleasant day is expected today as north-northeast surface flow prevails and reinforces the drier air mass currently in place. PWATs were observed as 1.88 inches on the 00Z sounding last evening, and global models depict potentially even lower values (1.2-1.4 inches) across interior South Florida. Mainly sunny and dry conditions should prevail overall today, although a few coastal showers may be possible during the morning hours today, and a couple isolated showers or storms may develop towards the early evening hours.
A little more moisture is able to work into the area from the south heading into Sunday afternoon, which may provide enough juice for slightly higher coverage of showers and storms on Sunday afternoon, although rain chances will still remain below average in the 30-40% range. Most of the day should be mostly sunny with showers and storms bubbling up during the mid-afternoon time period mainly across inland areas as surface flow veers more easterly. Minimal impacts expected to metro areas besides slightly higher cloud cover during the afternoon and evening compared to the morning hours.
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.LONG TERM... (Sunday night through Friday) Issued at 1252 AM EDT Sat Sep 20 2025
An upper level trough near the Great Lakes is forecast to slowly extend southward towards the southeastern US early next week. By mid to late week, the trough transitions into a cutoff low across the central US where it will slowly drift towards the Ohio and Tennessee Valley areas. This could lead to a weak boundary stalled across central Florida and potentially facilitate additional moisture across South Florida through the week. PWATs will rise back into the 2.0-2.2 inch range by Monday afternoon which is more typical for this time of year. East-northeast flow will prevail across South Florida through this time period which will give the east coast breeze the upper hand in dominating convective initiation, and will keep the area of maximum rain chances across interior and Southwest Florida each afternoon. Partly sunny conditions prevail during the morning hours with shower and thunderstorm development expected across interior areas during the each afternoon as sea breezes push inland and we reach maximum daytime heating. Slightly drier air might move into the region towards the end of the week as the boundary has the potential to pass south of the area. This could drop rain chances for Friday into the upcoming weekend.
High temperatures through the period will reach the lower 90s with overnight lows in the 70s.
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.AVIATION... (18Z TAFS) Issued at 115 PM EDT Sat Sep 20 2025
While VFR should prevail this afternoon, brief periods of MVFR/IFR are still possible with passing Atlantic showers, mainly over the east coast terminals. A northeasterly wind in the 8-12 kt range prevails through 01Z, then decreasing to around 6-8 kt later tonight.
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.MARINE... Issued at 1252 AM EDT Sat Sep 20 2025
A moderate east-northeasterly breeze will continue today. Seas across the Atlantic waters will generally remain between 2 to 3 feet while seas across the Gulf waters remain at 1 to 2 feet. Despite lower rain chances this weekend, a few showers and storms may develop across local waters. Periods of rough seas and gusty winds will be possible near the most robust shower and thunderstorm activity.
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.PRELIMINARY POINT TEMPS/POPS... Miami 77 89 78 89 / 30 50 40 60 West Kendall 76 89 76 89 / 30 60 40 70 Opa-Locka 77 90 77 89 / 30 50 30 60 Homestead 76 88 76 88 / 30 60 50 60 Fort Lauderdale 77 88 78 88 / 30 60 40 60 N Ft Lauderdale 78 89 78 89 / 30 50 40 60 Pembroke Pines 78 90 78 91 / 30 50 30 60 West Palm Beach 77 88 77 88 / 20 40 30 60 Boca Raton 77 90 77 89 / 30 50 40 60 Naples 75 92 76 90 / 10 30 10 60
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.MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. &&
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SHORT TERM...Rizzuto LONG TERM....Rizzuto UPDATE/AVIATION...17
NWS MFL Office Area Forecast Discussion