Flash flood warnings issued across Seminole County after heavy rain

Drivers were left stranded and streets turned into standing water across Seminole County Sunday evening after 2 to 4 inches of rain fell quickly, triggering flash flood warnings for areas including Altamonte Springs, Winter Springs and Lake Mary. Reports of high water on roads and flooding in underpasses pushed residents to avoid flooded streets as another round of rain remained possible.

The National Weather Service in Melbourne said scattered to numerous showers and storms were expected across east central Florida, with a Marginal Risk for excessive rainfall focused along the coast. The main threats included lightning, flooding and strong wind gusts, and forecasters said locally heavy rainfall could come from slow-moving storms as the region stayed in a summer-like sea breeze pattern into next week. Gusts could reach 40 to 50 mph in the strongest storms.

In Seminole County, that kind of rainfall can create fast-moving trouble in places where traffic is dense and drainage has struggled to keep up. Sanford, Longwood, Casselberry, Heathrow and Oviedo are among the communities where heavy rain can quickly spill onto major roads, complicating commutes and slowing emergency response. The flooding Sunday also put a spotlight on neighborhoods that have become familiar trouble spots, including Shadow Bay, where residents said water covered North Shadow Bay Boulevard and surrounding streets after heavy rain in recent days.

The pattern has raised a larger question for county leaders and residents: whether a few inches of rain are exposing isolated problem spots or a drainage system that is falling behind more intense storms. In Midway, Seminole County leaders broke ground on a long-awaited drainage project on March 25, 2026 after years of flooding complaints, underscoring how long some communities have waited for relief. Sunday’s warnings suggested the county was facing not just a burst of bad weather, but another test of whether its oldest flood-prone areas can handle the storms now rolling through Central Florida.