Here are a couple of articles and two short videos that attempt to explain how the sea might have been parted to allow the Israelites to cross.
You might notice the sea in this explaination doesn’t look much like the Red Sea as we know it today, or as is portrayed in films. Exodus, in its Hebrew original, describes in as Yam Suph, the Sea of Reeds, which is the term used for the Red Sea in other parts of the Bible; but some suggest the Sea of Reeds was in fact a more northerly lake, as seen in the videos.
Article: Computers show how wind could have parted Red Sea (summary; BBC)
Article: Could Wind Have Parted the Red Sea? (more detailed; Weatherwise)
Exodus: Gods and Kings 