559 FXUS62 KMFL 060716 AFDMFLArea Forecast Discussion National Weather Service Miami FL 316 AM EDT Sat Sep 6 2025
...New SHORT TERM, LONG TERM, MARINE...
.KEY MESSAGES... Updated at 211 AM EDT Sat Sep 6 2025
- Storms capable of producing rain heavier than usual today.
- Heavy rain threat gradually diminishes late this weekend into next week.
- Wet pattern continues through next week.
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.SHORT TERM... (Today through Sunday) Issued at 211 AM EDT Sat Sep 6 2025
Today... WV imagery this morning depicts an elongated shortwave stretched northeast to southwest from the Mid-Atlantic, through north- central Florida, and into the eastern Gulf. At the surface, a 05z hand analysis continues to show a tight Td gradient across central Florida, with a more defined trough stretching from the southeast Gulf, across south Florida, bending northward back towards the Mid-Atlantic. South of this boundary, winds are generally southerly and easterly to its north. The 00z sounding from MFL sampled PWATs of about 2.3" which is very similar to yesterday and still in the upper 10th percentile of climatology for this time of year. While there`s plenty of moisture, the cirrus canopy is a bit less this morning than previous days and may allow for a bit more destabilization across land areas today. The presence of the upper level trough may help with an earlier start to, and more numerous convection along, the Gulf breeze at it moves inland this morning. Storms should then work their way towards and up the east coast along the east coast seabreeze that will remain pinned close to the coast. With 700mb flow veered a bit from the surface, it may mean that storms that initially move off the east coast seabreeze will get pushed back towards the coast as they generally move north/northeastward. Global, hi-res, and calibrated guidance depicts lower potential QPF values than yesterday. This may be because some upper level dry air on the edge of the shortwave may sneak into south Florida today and start to lower the PWATs a bit. That said, expect about 1-2" of rain in most storms that develop, with a scattered few producing around 2-3". Where low-level flow may result in some back-building or training storms along the Broward and especially Palm Beach metros, a reasonable worst case in an isolated location or two would be around 4".
Sunday... The upper-level wave will have advected out of the region by Sunday, leaving behind some upper-level dry air. The surface trough is expected to be a little less pronounced as well. It`s likely that the main forcing for convection will be along the seabreezes. With low-level flow remaining southwesterly, that will favor a pattern of late morning/early afternoon storms along the Gulf coast, becoming more numerous and robust along the east coast in the mid to late afternoon. The highest coverage will likely be across Palm Beach county where the lake breeze could enhance convection along the Atlantic breeze. With the reduction of PWATs to the upper quartile of climatology, expect more typical rain amounts with storms that develop.
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.LONG TERM... (Sunday night through Friday) Issued at 211 AM EDT Sat Sep 6 2025
A gradual amplification of the eastern CONUS trough by multiple shortwaves is expected early next week through mid-week. Ensembles are in pretty good agreement through Tuesday, but differences in the core of the northern stream pattern across the Great Lakes region start to introduce QPF differences mid to late week across Florida based on the amplification of the shortwave at the base of the trough. Generally speaking, the pattern consisting of upper- level support, a weak surface boundary, and messy seabreeze interactions is expected to continue through most if not all of next week. Rain chances will remain above average, but PWATs appear to be closer to average. There may still be some minor flooding concerns based on storm movements, but individual storms may not be as efficient at producing heavy rain as they have been this past week.
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.AVIATION... (06Z TAFS) Issued at 131 AM EDT Sat Sep 6 2025
Low-level southwesterly flow will favor the seabreezes converging along the east coast later this afternoon. Heavier than usual rain will be possible within the stronger storms. Showers and storms should come to an end rather quickly by the evening hours.
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.MARINE... Issued at 211 AM EDT Sat Sep 6 2025
A gentle south to southwesterly wind flow will remain in place across most of the local waters through the weekend. Scattered to numerous showers and thunderstorms will be possible each day through the weekend. Locally hazardous winds and seas could develop in and around thunderstorm activity.
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.PRELIMINARY POINT TEMPS/POPS... Miami 89 77 90 77 / 80 50 80 60 West Kendall 89 76 90 76 / 80 50 80 50 Opa-Locka 90 77 91 76 / 80 50 80 60 Homestead 88 76 89 76 / 80 60 60 50 Fort Lauderdale 88 77 90 76 / 80 60 80 60 N Ft Lauderdale 90 77 91 77 / 80 50 80 60 Pembroke Pines 91 77 92 76 / 80 50 80 60 West Palm Beach 90 76 91 76 / 80 70 80 60 Boca Raton 90 76 91 76 / 80 60 80 70 Naples 90 78 89 77 / 80 70 70 40
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.MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. &&
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SHORT TERM...Harrigan LONG TERM....Harrigan AVIATION...Harrigan
NWS mfl Office Area Forecast Discussion