Cyclone

you need four things. get one wrong and it fizzles.

drag sea temp, wind shear, latitude and humidity — hold all four and watch a storm organize

A tropical cyclone needs four things at once: water above about 26.5C, wind shear below roughly 10 knots, distance from the equator to spin, and enough humidity to survive. Miss one and it fizzles.

Concepts: criticality, thermodynamics.

An interactive you play with one thumb, on Wundr.