A scale for these systems was updated in 2006 to account for additional damage indicators such as construction quality. A "hook echo" on the radar is a characteristic sign of one of these systems. A Totable Observatory for these systems failed to work due to having too a high center of gravity for the intense winds. These phenomena are usually formed from mesocyclones in supercells. The Enhanced Fujita Scale is used to measure the intensity of these phenomena. For 10 points, name these rotating funnel clouds that frequently occur in their namesake "Alley" in the American Midwest.
A) Dust storms
B) Tornadoes
C) Hurricanes
D) Thunderstorms