Cyclones.

This is the intro to the subject Cyclogenesis in Wikipedia. It is mainstream, concise, comprehensive and wrong. …

Some editing for length you can find the rest of it here.

Cyclone refers to an area of closed, circular fluid motion rotating in the same direction as the Earth. This is usually characterized by inward spiraling winds that rotate counter clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.

The largest low-pressure systems are cold-core polar cyclones and extratropical cyclones which lie on the synoptic scale. Warm-core cyclones such as tropical cyclones, mesocyclones, and polar lows lie within the smaller mesoscale. Subtropical cyclones are of intermediate size.

Extratropical cyclones form as waves in large regions of midlatitude temperature contrasts called baroclinic zones.

These zones contract to form weather fronts as the cyclone intensifies. Later in their life cycle, cyclones occlude as cold core systems. A cyclone's track is guided over the course of its 2 to 6 day life cycle by the steering flow of the polar or subtropical jetstream.

Weather fronts separate two masses of air of different densities and are associated with the most prominent meteorological phenomena.

Air masses separated by a front may differ in temperature or humidity.

Strong cold fronts typically feature narrow bands of thunderstorms and severe weather and may on occasion be preceded by squall lines or dry lines.

They form west of the circulation center and generally move from west to east.

Warm fronts form east of the cyclone center and are usually preceded by stratiform precipitation and fog. They move poleward ahead of the cyclone path.

Occluded fronts form late in the cyclone life cycle near the center of the cyclone and often wrap around the storm center.

Tropical cyclones form due to latent heat driven by significant thunderstorm activity, and are warm core.

Cyclones can transition between extratropical, subtropical, and tropical phases under the right conditions.

Mesocyclones form as warm core cyclones over land, and can lead to tornado formation.

Waterspouts can also form from mesocyclones but more often develop from environments of high instability and low vertical wind shear.

This was obviously written by someone who knows what he is talking about. Probably an highly regarded expert. But it isn't easy for us lamers in the subject to follow.

I am going to give my take on it in another post.

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