Illustration of a wind vector, the two- or three-dimensional vector describing the instantaneous wind magnitude and direction at a point (often using Cartesian coordinates; i.e. X and Y wind vectors). The term can also apply to the resultant wind vector which is sometimes drawn as an arrow with length proportional to wind speed
Illustration of cumulonimbus clouds, tall, dense, and involved in thunderstorms and other intense weather. Cumulonimbus means "column rain" in Latin. It is a result of atmospheric instability. These clouds can form alone, in clusters, or along a cold front in a squall line. They create lightning through the heart of the cloud. Cumulonimbus storm cells can produce heavy rain (particularly of a convective nature) and flash flooding, as well as straight-line winds