The Vancouver F3 tornado of April 5, 1972, which killed six people and injured over 300, stands alone in the record books. The 1972 tornado was similar in atmospheric structure to many local tornados, including that of the Hazel Dell EF1 tornado of 2008. However, it was significantly stronger. The tornado spun up to F3 status and stayed on the ground for nearly 8 miles. The resulting tornado caused five to six million dollars in property damage in Vancouver alone. Unlike tornadoes east of the Rockies, tornadoes in the Pacific Northwest are often called "cold core" due to their lack of humid and buoyant air, which prevents them from forming supercell thunderstorms. Meteorologists have speculated that both Willamette Valley and West Hills could aid in the development of tornadoes across Clark County.