textproduct: Miami - South Florida

KEY MESSAGES

Updated at 355 AM EDT Mon Oct 5 2026

- Showers and Thunderstorms today will likely favor interior areas of South Florida.

- Rainfall chances increase this week as a frontal boundary stalls across northern/central Florida.

SHORT TERM

(Today through Tuesday) Issued at 355 AM EDT Mon Oct 5 2026

GFS/EURO and ensembles show fair consensus in the overall synoptic scenario for the short term with a deepening trough dropping into the SE CONUS, while a sfc front pushes southward into the northern portions of the peninsula. A rather persistent feature in guidance is the potential for an area of low pressure forming along the front over the Florida Panhandle region today.

A main change in latest model runs is that the front over N Fl seems to push further south through the peninsula, possibly reaching C Fl by Tuesday. And with the mid-lvl ridging finally eroding, the result will be a significant surge in moisture across SoFlo starting today, with PWATs expected just over 2", and possibly into the 2.4-2.5" range by Tuesday afternoon.

Mesoscale analysis parameters for today describe an overall saturated air mass across the area, with weak to moderate CAPE (1.0K- 1.5K j/kg), LIs slightly cooler today but still in the -3C to -5C, and generally weak lapse rates. And while this profile should support ordinary thunderstorms, it lacks the ideal vertical support (low wind shear/updraft strength) normally seen for severe cells. But a few strong or an isolated severe cell can't be ruled out. The weak dynamic support will also translate in fairly weak storm motion, with mainly short-lived pulse-style or multicellular clusters potentially resulting in slow-moving or even stationary downpours at times. Therefore, flooding will be the primary hazard today, especially with sea breeze-driven showers and storms. Best chances for rain will reside over interior western SoFlo with highest POPs in the 50-60% range.

By Tuesday, thermodynamic and stability parameters become more supportive for organized cells as the deeper moisture reaches the area. NBM responds by pushing afternoon POPs into the 60-70% range for much of SoFlo, with scattered to numerous showers and thunderstorms expected. WPC latest outlook for excessive rainfall starts by highlighting N Fl today, but it gradually expands southwards and reaching the Lake region by mid week. This may change with upcoming guidance and the local forecast will be adjusted as the situation evolves.

Despite the onset of a wetter weather pattern, the hot conditions will continue today and Tuesday with afternoon highs around 90 over much of SoFlo. Heat Index values should modify tomorrow from the low- mid 100s today, to upper 90s-low 100s by Tuesday afternoon as cloud cover and rain activity increases.

LONG TERM

(Tuesday night through Sunday) Issued at 355 AM EDT Mon Oct 5 2026

Model consensus remains fair about a potential low developing along a stalled frontal boundary around C Fl, which then slowly migrates northward across the W Atlantic. GFS is the more aggressive solution showing a stronger low on Wednesday, but regardless of the final outcome of this feature, guidance agreement depicts an overall wet pattern persisting through the end of the work week. This will also result in having a rather weak southerly flow (or even clam at times), which may combine with the influence of the low to enhance tropical moisture advection across the state. NBM shows Wednesday and Thursday as the wettest days with highest POPs in the 80-90% range for much of the area.

The overall light flow regime will also allow for afternoon sea breeze and storm outflow boundaries to drive storm development and motion. Main hazards will include damaging gusts, lightning strikes, and localized flooding. WPC day-3 outlook includes Palm Beach county and portions of the Lake region in their excessive rainfall outlook marginal category. Therefore, expect a rather rainy weather pattern to prevail through Friday.

High pressure should then reestablish in the wake of the low/front for the start of the weekend, bringing back a more typical easterly wind regime, along with decreasing POPs/Wx coverage.

Latest NBM temps show a modest cooling trend for Wednesday and Thursday with afternoon highs remaining in the mid-upper 80s, then back to around 90 or low 90s for the rest of the upcoming weekend.

MARINE

Issued at 355 AM EDT Mon Oct 5 2026

The moderate to fresh east southeasterly flow will weaken today, and could become south-southwesterly across the Gulf waters during the forecast period as a frontal boundary approaches central Florida. Increasing showers and thunderstorms are expected through the forecast period, with periods of gusty winds and rough seas accompanying any thunderstorm that forms.

Gulf Stream Hazards: None.

PRELIMINARY POINT TEMPS/POPS

Miami 89 77 89 77 / 10 10 50 20 West Kendall 89 76 89 75 / 20 10 50 10 Opa-Locka 90 77 89 76 / 10 10 60 30 Homestead 89 77 89 77 / 10 10 40 10 Fort Lauderdale 88 77 88 76 / 10 10 60 40 N Ft Lauderdale 89 77 89 76 / 10 20 60 40 Pembroke Pines 89 77 89 76 / 10 10 60 30 West Palm Beach 89 76 89 75 / 20 20 60 60 Boca Raton 88 76 88 75 / 20 20 60 50 Naples 88 76 87 76 / 20 30 40 50

MFL WATCHES/WARNINGS/ADVISORIES

FL...None. AM...None. GM...None.