These systems are ranked in intensity on the Saffir-Simpson scale.
The maximum potential intensity of these systems is a strong function of the difference in Convective Available Energy between saturation and the boundary layer. During El Nino years, increased vertical shear in the Atlantic reduces the intensity of these systems, and they generate through secondary circulation, in which (*) ocean-surface saturated air rises, condenses, and precipitates. These systems are ranked in intensity on the Saffir-Simpson scale. The barometric pressure of these phenomena is lowest at their centers, and they evolve from tropical storms. For 10 points, name these massive storms, exemplified by Matthew and Katrina.
The maximum potential intensity of these systems is a strong function of the difference in Convective Available Energy between saturation and the boundary layer.
hurricane (accept any of depression or cyclone or typhoon; accept tropical storm before mention; prompt on things like storm or thunderstorm)