Two more tropical systems trail Hurricane Erin, which is following a projected course that brushes past the East Coast without making landfall.

While Erin won't hit the U.S. directly, the storm's biggest impact on the East Coast will be along the Outer Banks of North Carolina, where coastal flood watches, tropical storm watches and storm surge watches are in effect. The storm surge could be as high as 4 feet.

Erin isn't as intense as it once was. But its large size is what matters most. While it won't landfall, it will bring high surf and rip currents to much of the East Coast. And it could bring damaging surge flooding for some.