Because the indefinite article 'a' means any one of a kind or group. In this sentence you are not talking about one cyclone, but any cyclone, cyclones in general. Also cyclones is plural. So you use zero article.
If you said 'A cyclone is generally accompanied .............' then that is ok.
This applies to the other nouns precipitation and weather.
cyclones
when a warm and cold air come in as a contact it is like cold air is heavier than warm air so it sinks forcing lighter warm air to rise
When a Hurricane hits land, it creates huge waves, very heavy rains, and can cause flooding. Afterwards the storm will weaken rapidly.
Jupiter has a huge storm that has been going for many years. It is named the Great Red Spot.
In the US the cyclones form around June 1st to November 30th and in AUS, November 1st to april but can happen any time
Yes. Most cyclones produce precipitation.
Cyclones and decreasing air pressure are associated with wind, clouds, and precipitation.
Yes. Cyclones often produce thunderstorms, and tornado occur during thunderstorms. So both are commonly accompanied by lighting.
Air in cyclones undergoes cooling as it rises.
Cyclones in Europe are known as cyclones. They are not called hurricanes - this is a term generally reserved for cyclones in the Americas.
Although there is weather on Jupiter, there is not technically any precipitation. Rather, Jupiter experiences cloud formations, lightning, and gigantic cyclones.
The term cyclone refers to a wide variety of weather phenomena. Many cyclones are not particularly violent, though tropical cyclones (hurricanes and typhoons) generally are. Generally speaking tornadoes are more violent than cyclones but cyclones cover a much larger area and so release much more energy.
Yes. France can get mid-latitude cyclones. Howevere, these are not the same as tropical cyclones (a.k.a. hurricanes, typhoons, etc) and are generally far less severe.
Yes, surface cyclones are typically accompanied by divergence aloft in the upper levels of the atmosphere. This divergence allows for rising air and helps to enhance the development and intensification of the surface cyclone.
The air in the center of cyclones rises. As warm, moist air converges at the center of a cyclone and is forced upwards, it cools, condenses, and forms clouds and precipitation. This rising motion generates the low-pressure system characteristic of cyclones.
It is because using the articles would change the meaning.
Cyclones in the western hemisphere are generally called hurricanes.