For context for international members:
Erin is the newest tropical event in the Atlantic, the first full hurricane of the 2025 season. Through Saturday, Erin roared from developing into a tropical storm into a category 5 hurricane in a matter of hours (one of the fastest developments on record, one of only a half dozen storms to exceed 145 MPH wind speed). The storm is currently in a eyewall replacement phase as a category 3, and is NOT expected (at this time) to hit the Eastern US.
However, eyewall replacement phase typically results in a widening of the storm, so coastal regions are expected to be hit with aggressive waves, surf, and rip currents in the coming days.
Given how this storm has bucked trends, Fnu is right to be worried about impacts later in the week, thought I think the greatest concern will be the Carolina coasts given current trends, but nothing is set in stone.