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

The Atlantic basin includes the northern Atlantic Ocean, Caribbean Sea and Gulf of America, as the Gulf of Mexico is now known in the U.S. per an order from President Trump. NOAA and the National Hurricane Center are now using Gulf of America on its maps and in its advisories.

Forecasts nudge Erin's likely path to the west, increasing the risks at U.S. beaches. Experts say the storm's massive size, rather than windspeed, is what makes it a threat.

Hurricane watchers are eying systems in the Atlantic basin. One has a medium chance of developing later this week.

Tropical Storm Erin's path puts some homeowners at heightened risk, as the storm starts building into a hurricane tracked by meteorologists.

The Ocean City Beach Patrol has closed the ocean to swimming, wading and surfing Tuesday as tropical storm activity off the coast brings dangerous conditions to the resort town.

Dangerous coastal impacts from Hurricane Erin will peak along the East Coast on Wednesday and Thursday as the storm passes offshore.