Original: The Blizzard of 2003, also known as the Presidents' Day Storm II or simply PDII, was a historical and record-breaking snowstorm on the East Coast of the United States and Canada, which lasted from February 14 to February 19, 2003.
Simplified: The Blizzard of 2003, also called the Presidents' Day Storm of 2003, or Presidents' Day Storm II, was a very big snowstorm on the East Coast of the United States and Canada, which started on February 15 and ended on February 18, 2003.