The National Weather Service has issued Coastal Flood Advisories for Miami-Dade, Broward and Palm Beach counties through 11 p.m. Thursday, warning that high tides could flood roads, parking lots and other low-lying areas. A separate round of king tides is expected to peak later in the weekend and early next week, as rain and strong winds may make coastal and urban flooding worse.

The Weather Prediction Center has placed parts of the East Coast metro area under a slight risk of excessive rainfall and flash flooding for Saturday, Oct. 24. The risk area extends from near Port St. Lucie south to northern Miami.

Forecast rainfall totals are still uncertain. A lower-impact scenario calls for 1 to 2 inches over the weekend, while other scenarios project 5 to 7 inches in 48 hours, with isolated locations potentially receiving considerably more. Heavy downpours could cause flash flooding on streets and in neighborhoods with poor drainage.

Sunday may bring the most difficult combination of weather, with heavy rain and sustained winds of 25 to 30 mph. Gusts could exceed 40 mph. Rain may linger through Monday, extending the risk in places where water has already accumulated.

The king-tide cycle runs from Oct. 24 through Oct. 30. The annual astronomical peak along Florida’s East Coast is expected Tuesday, Oct. 27; in the Florida Keys, the highest levels are forecast for Oct. 28 and 30.

King tides are exceptionally high astronomical tides caused by the alignment of the sun, moon and Earth. Strong winds from the northeast and east can push additional water toward shore. When high tides coincide with heavy rainfall, elevated sea levels can also slow drainage, increasing the chance of flooding from both seawater and rain.

Palm Beach County is also under a High Surf Advisory, with breaking waves of 5 to 7 feet, and a high risk of rip currents is in effect along Atlantic beaches through Friday. Forecast details, including where the heaviest rain will fall, could change.