System collision?

[Deep Snow please]

Continuing discussion from MAD thread as I'm not utterly confused. Could someone give me a laymans run down of what happens when different pressure systems collide with each-other? Is it always the same or is it governed by external factors?

 

I.e

1. Low Pressure and Low Pressure
2. High Pressure and Low Pressure
3. High Pressure and High Pressure

[Mokidugway]

On 25/01/2019 at 18:18, Deep Snow please said:

Continuing discussion from MAD thread as I'm not utterly confused. Could someone give me a laymans run down of what happens when different pressure systems collide with each-other? Is it always the same or is it governed by external factors?

 

I.e

1. Low Pressure and Low Pressure
2. High Pressure and Low Pressure
3. High Pressure and High Pressure

Depends on cold front or warm front , cold being denser undercuts warm  ,fluid dynamics  basically