No scientific explanation.
Wyatt Archaeological Research has done the best scientific analysis of artifacts found at the site of the Red Sea crossing in a series of articles and research from 1978 to 2014. I have attended seminars and find them rather convincing. But there is no natural phenomenon which would have accounted for this.
As I read some of the responses, I am surprised to see how easily some have bought into the theories that major Bible events were fabricated. Often times these claims of fabrication are based on the prejudices and lack of information on those who make such claims. In reality, Egyptians in the inter-testamental period (from about 2,400 years ago to the times of Christ) had no trouble believing in the Exodus story, from which Egypt never recovered.