A nor'easter is about to develop off the Southeast coast and this coastal storm could bring some serious threats along with dreary weather for much of the East Coast into early next week. The nor'easter is expected to develop on Saturday just off the Southeast coast and will likely churn up seas, deliver drenching coastal rain and whip up gusty winds from Florida through the Carolinas, mid-Atlantic and into parts of the Northeast. It could turn out to be a "full-fledged" and "rather significant" nor'easter, the Weather Prediction Center warned.