Flood advisory issued after 3 inches of rain flood Lake Mary, Seminole County

Water rose fast in Lake Mary after more than 3 inches of rain fell in less than 90 minutes, forcing the National Weather Service to issue a flood advisory for Seminole County until 8 p.m. The hardest-hit areas were on the county’s western side, where localized flash flooding developed as slow-moving storms dumped heavy rain into streets and low-lying drainage areas.

National Weather Service forecasters in Melbourne warned that excessive rainfall rates in slow-moving storms could overwhelm urban and poorly drained locations across east central Florida. Their Seminole County forecast kept a chance of showers and thunderstorms in the outlook, with flooding risk still on the table as the rainy pattern continued into June 12. The broader weather setup called for a gradual increase in showers and storms each day through the weekend, and forecasters said flood-producing rain could linger into next week.

The flooding underscored how quickly routine summer storms can become a public-safety issue in Lake Mary and other western Seminole County neighborhoods. Even without tropical weather, the county’s paved surfaces, drainage canals and low-lying roads can fill rapidly when rainfall arrives in a short burst. In this case, the rain came down hard enough to push conditions from wet streets to flash flooding in under an hour and a half.

The event also landed in a county already grappling with long-running drainage concerns. Seminole County has been pursuing flood mitigation studies and sharing the results with residents as it tries to answer where flood risk remains highest and which neighborhoods need the most investment. County officials also broke ground in March 2026 on a drainage project in the Midway community, aimed at reducing flooded roads and properties after years of repeated problems there.

That work reflects a broader question facing Seminole County: whether infrastructure is keeping pace with the rainfall intensity now showing up in repeated storm events. A June 2026 report from WKMG News 6 / ClickOrlando noted that nearly 350,000 properties statewide face flood hazards not recognized as high risk in FEMA flood maps, a reminder that official maps do not always capture the places where water can pile up during extreme rain.

For Seminole County, June 11 was another warning that flash flooding is not limited to coastlines or hurricane season. In Lake Mary and across the western side of the county, a single storm system turned a short stretch of heavy rain into a fast-moving drainage test that officials are still working to meet.