As the storm approached landfall, the National Hurricane Center renamed the hurricane "Post-Tropical ... storm Sandy. What happened in the atmosphere that caused this monstrous storm to form?

HARLINGEN, Texas (ValleyCentral) – The National Hurricane Center says winds have strengthened and Sara is now a tropical storm in the Caribbean with the chance of eventually moving into the Gulf ...

Like Sandy did, this storm may also interact with non-tropical weather systems that could allow it to re-intensify as a hybrid tropical-post-tropical storm while it remains off the East Coast.