The south of Florida enjoys this Thursday its last relatively calm day before a stationary front laden with tropical moisture turns the weekend into one of the rainiest of the fall, with accumulations of 3 to 5 inches of rain expected by Monday in Miami-Dade, Broward, and Palm Beach, according to forecasts from Fox Weather and CBS Miami.
This Thursday, high temperatures will be around 90 °F, but the heat index could soar to 100 °F in the afternoon due to humidity. CBS Miami advises staying hydrated, as "heat indices will spike into the high 90s and 100 °F in the afternoon hours when humidity is taken into account."
East winds will blow with gusts of 15 to 20 mph, and the risk of rip currents on the beaches of Miami-Dade and Broward is low, although the National Weather Service (NWS) maintains a high risk in Palm Beach until 8 PM.
On Friday, scattered showers will arrive, driven by the breeze, with highs in the upper 80s °F and a heat index approaching 97 °F. Nothing that isn’t manageable, but a sign of what’s to come.
On Saturday, the outlook changes significantly: an 80% chance of rain, scattered to widespread storms, and downpours that could accumulate between 2 and 4 inches in 24 hours just in Miami-Dade and Broward, according to the worst-case scenario from the NWS. CBS Miami puts it bluntly: "Saturday looks drenching, with scattered storms that could produce heavy downpours."
Sunday will be the most complicated day of the weekend. Storms will spread throughout the region, the chance of rain rises to 90%, and gusts could reach 30 mph or more.
"The probability of rain is even higher on Sunday, with more widespread storms and the potential for heavy rainfall and localized flooding," warns CBS Miami. The unstable pattern will continue into the start of the following week.
The mechanism behind all this is a decaying front that remains stationary over southern Florida, combined with high pressure that tightens the gradient over the peninsula. This fuels easterly winds of 30 to 40 mph along the Atlantic coast from Daytona Beach to Miami-Dade.
Fox Weather has issued a level 1 out of 4 flood threat for the entire east coast of Florida. Important: this is not a tropical system, but rather a frontal rain system with deep tropical moisture.
Conditions at beaches and for navigation will be hazardous throughout the weekend: high waves, rip currents, and strong onshore winds. The NWS has not issued a formal flood alert for the entire region, but it does warn of localized flooding in urban areas with poor drainage.
The areas of Miami-Dade that have historically been more vulnerable are Hialeah, Sweetwater, Brickell, Downtown Miami, and Miami Beach, as well as Doral, Medley, Tamiami, Kendall, and Coral Gables.
Depressed roads and low streets near canals are the most critical points. The recommendation is clear: never drive a vehicle into a flooded street, even if it appears to be shallow.
Beyond the weekend, the next spring tides are expected from October 24 to 30, peaking on October 26 and 27 near the full moon. Fox Weather warns that the rain and onshore winds this weekend could raise water levels and anticipate some of the effects of these tides, causing moderate coastal flooding in Atlantic coast communities even without additional rainfall.
It is important to remember that the conventional homeowners insurance does not cover floods and that new policies from the National Flood Insurance Program (NFIP) have a waiting period of 30 days before they take effect, meaning that those who do not have coverage can no longer obtain it in time for this event.
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