Hurricane Michael crashed ashore Wednesday afternoon as a Category 4 storm, ravaging the Florida Panhandle with 155-mph winds and a brutal storm surge.

Read more: Fierce Hurricane Michael makes landfall in Florida Panhandle near Mexico Beach as Category 4

Already, flood waters have swamped hard hit areas. But remember, even after hurricanes pass, they often leave overflowing rivers and streams in their wake. Flood waters can take weeks to recede.

The Tampa Bay Times is collecting water height data from across the state in real-time. In the map below, click on any dot to see how high the water has risen, based on the most recent measurement available. As flooding gets worse and worse, more dots will turn blue. By Wednesday afternoon, Spring Creek and the Sopchoppy River in Wakulla County had already flooded.