Tropical Storm Erin is expected to strengthen into a hurricane. See the latest update on Friday, Aug. 15. Tropical Storm Erin continues to travel west and is on pace to strengthen into the season's first major hurricane by the end of this week,

The National Hurricane Center's prediction cone shows a westward trajectory, but doesn't paint a clear picture whether or not it's likely to impact the east coast of the United States. Spaghetti models, which represent a collection of predicted paths generated by multiple computer models, paint a more definitive picture as of Wednesday morning.