SANTA MONICA, Calif., July 2, 2000 -- "Storm" clouds unexpectedly dominated the July Fourth weekend box office skies, raining on what was expected to be Mel Gibson's parade. Nonetheless, there was plenty of room in the holiday marketplace for both Warner Bros.' "The Perfect Storm" and Columbia and Centropolis Entertainment's "The Patriot" to do blockbuster business. "Storm" made big waves with ticket sales of nearly $42 million, while "Patriot" marched ahead, grossing nearly $22 million with ver