Mount Washington is the highest peak in the Northeastern United States at 6,288 ft (1,917 m) and the most prominent mountain east of the Mississippi River. It is famous for dangerously erratic weather. For 76 years, until 2010, a weather observatory on the summit held the record for the highest wind gust directly measured at the Earth's surface, 231 mph (372 km/h or 103 m/s), on the afternoon of April 12, 1934. Before European settlers arrived, the mountain was known as Agiocochook, or "Home of the Great Spirit".[5]