What are the common weather systems?

Common weather systems include planetary scale weather system, weather scale weather system, mesoscale weather system, mesoscale weather system and small scale weather system.

1, planetary scale weather system

Planetary scale weather system is a weather system that affects the global, hemispheric or intercontinental scope. It is very important for short-,medium-and long-term weather forecast to study its development and change law.

2. Weather scale weather system

Weather scale system refers to a weather system with a horizontal scale of several hundred to several Qian Qian meters and a time scale of 1 day to several days. Including cyclones, anticyclones, typhoons, fronts, shear lines, etc. They can be analyzed on large-scale weather maps (such as Asia-Europe weather map and East Asia weather map), and are the main objects of weather map analysis and research, especially for short-term weather and weather scale systems.

3. Mesoscale weather system

Mesoscale weather system is a weather system with a horizontal scale of several hundred kilometers to one thousand kilometers. The small trough or wind shear (see shear line) produced in the northwest airflow behind the upper air cold vortex also belongs to the mesoscale weather system. Mesoscale weather system mainly appears in the lower troposphere, and its flow field characteristics (cyclone circulation or shear) are more obvious than the pressure field (low pressure).

4. Mesoscale weather system

Mesoscale weather system, its horizontal scale is 10 ~ 200 (or 300) kilometers, and its life history is 1 ~ 10 hour. Such as squall line, thunderstorm, mesoscale low pressure and thunderstorm high pressure.

5. Small scale weather system

A small-scale weather system refers to a weather system with a horizontal scale of less than 40 kilometers and a life history of only 10 minutes to 3 hours. Such as tornadoes and isolated thunderstorms.

Baidu Encyclopedia-Weather System