By Nathan Frandino HALF MOON BAY, California (Reuters) – At the famous Mavericks Beach surf spot, big waves thundering into the California coastline on Thursday attracted surfers and spectators alike to the legendary break 25 miles south of San Francisco. Waves were forecast to reach as high as 30 to 40-feet (9 to 12 meters) at Mavericks, according to the website Surfline. Spectators climbed a beachside cliff to peer through drizzle and heavy fog and watch the surfers catch the gnarly swells. “Super stoked to be out here. It’s just awesome to have everyone else out here appreciating like what …