Published: Jun 28, 2013 4:25 PM EDT

HURRICANE CENTRAL - One of the three dangers of a tropical system is rain and the deadly freshwater flooding it brings.

Rainfall amounts are the highest in slow-moving systems and some of the worst flooding doesn't come from hurricanes but from tropical depressions and tropical storms.

Tropical Storm Fay moved onshore August 19th around 7 a.m. just south of Marco Island. As Fay moved inland, it did what most storms don't do, it strengthened. On radar you can see a well developed eye wall and the heavy rain that soaked Southwest Florida.

Fay made landfall a record four times in Florida, first hitting Key West, then just south of Marco Island, again in Flagler Beach and then finally in the Panhandle.

The slow-moving storm produced seven to 10 inches of rain in Collier, Hendry and Glades counties. Moore Haven in Glades recorded more than 16 inches in just 48 hours.

Fay not only dropped heavy rain in Southwest Florida, but on the east coast, Brevard County saw more than 20 inches of rain.

Tropical Storm Fay caused $560 million in damage and flooded out 15,000 homes.