Forecasting a storm's intensity can be more challenging than predicting where it will make landfall. Forecast models, particularly for hurricanes, have improved, but they can still miss intensification or overstate it. Below is the intensity for Erin so far, and how experts at the Hurricane Center believe it will weaken or strengthen.

The storm brought heavy rain and wind over the weekend to parts of the Caribbean and it will send large swells up and down the East Coast, putting communities on alert for rip currents.