The formation of these structures usually begins with a warm RFD, though a cold, wet FFD might also occur.
The formation of these structures usually begins with a warm RFD, though a cold, wet FFD might also occur. Shortly before these entities form, a "hook echo" often appears on Doppler radar, which will typically have a large quantity of debris at the tip. These entities typically are either of the wedge or stovepipe varieties. The Great Natchez one of these entities appeared in Mississippi in 1840. When they occur over water, they are called waterspouts. Their strength is now typically measured on the EF, or Enhanced Fujita scale. For 10 points, identify these rapidly rotating columns of air that occur predominantly in a namesake "Alley" of midwest states.
The formation of these structures usually begins with a warm RFD, though a cold, wet FFD might also occur.
tornadoes [accept waterspouts before mentioned]