Map: Track tropical storm Cristobal as it makes its way to the U.S.

Here comes tropical storm Cristobal.

The rain-heavy tropical storm, which has already brought flooding to Mexico and portions of Central America, is forecast to gain strength as it travels across the Gulf of Mexico.

Tropical storm-force winds are expected arrive in the U.S. overnight, according to the National Hurricane Center at NOAA. Parts of the Louisiana and Mississippi coasts are under either Storm Surge Warning or a Storm Surge Watch.

Track the movement of the storm center and the latest in the forecast from the National Hurricane Center with this map: