| A | B |
|---|
| Backing Wind | A shift in a counterclockwise direction, example from east to north. |
| Cold Front | When cold air actively advances into a region occupied by warmer air. |
| Cold Type Occluded Front | Most common occluded front where colder air over takes cooler air. |
| Cyclogenesis | Process that creates a new cyclone. |
| Directional Divergence | The spreading out of an air stream after a trough in the upper atmosphere. |
| Front | Boundaries that separate different air masses. |
| Middle Latitude Cyclone | Are large cyclones of low pressure systems that travel from west to east. |
| Occluded Front | Where a cold front over takes a warm front and the warm air rides aloft. |
| Occlusion | The over taking of one front by another. |
| Overrunning | Warm air overriding and gliding over the cold air. |
| Polar Front Theory | States that polar fronts, separating polar and tropical air masses, gives rise to cyclonic disturbances that intensify and move along the front and pass through a succession of stages. |
| Speed Divergence | The divergence of air aloft that results form the variations in velocity that occur along the axis of a jet stream. As wind moves from an area of lower to faster speed and diverges. |
| Stationary Front | A situation in which the surface position of a front does not move; the flow on either side of such a boundary is nearly parallel to the position of the front. |
| Veering Wind Shift | A shift in a clockwise direction, example from north to east. |
| Vorticity | The tendency of air to rotate like a vortex in a whirl-pool. |
| Warm Front | The frontal position of the warm air. |
| Warm Type Occluded Front | Least common occluded front where cooler air over takes cooled air. |
| Wave Cyclone | Are large cyclones of low pressure systems that travel from west to east. |
