Air moves into a Low pressure system. It pushes any air that was there upwards. Windows Original

The H for high pressure systems and alternatively the L for low pressure systems are relative measures of the pressure in that particular system compared to the pressure around the system. There are no exact measurements that would make a particular system a High and another a Low. It’s all relative!

The differences in pressure from one place to another on Earth are what cause wind. You see, air wants to move from areas of high pressure to areas of low pressure. Away from areas of high pressure and into areas of low pressure...

The Coriolis Force also adds rotation to the movement of air around pressure systems. In the Northern Hemisphere, air moves clockwise around a High and counter-clockwise around a Low. In summary, air moves away and clockwise from a High and into and counter-clockwise from a Low.

Air moves into a Low pressure system. It pushes any air that was there upwards. As the air rises, it experiences lower pressures and lower temperatures. These lower temperatures force water vapor to condense into clouds that can yield precipitation. That’s why many people equate seeing a red L on weather chart with bad weather, cloudy skies and possibilities of rain or snow.

Air moves into a Low pressure system. It pushes any air that was there upwards. Windows Original

There are no exact measurements that would make a system a Low. It's all relative! If a certain system is a Low pressure system, that means it has lower pressure then the areas around it.

The differences in pressure from one place to another on Earth are what cause wind. You see, air wants to move from areas of high pressure to areas of low pressure. Away from areas of high pressure and into areas of low pressure...

The Coriolis Force also adds rotation to the movement of air. In the Northern Hemisphere, air moves clockwise around a High and counter-clockwise around a Low.

Air moves into a Low pressure system. It pushes any air that was there up. As the air rises, water vapor condenses into clouds that can bring precipitation. That's why many people see a red L on weather chart and know there is a good chance of "bad" weather - cloudy skies and possibilities of rain or snow.

Air moves into a Low pressure system. It pushes any air that was there upwards. Windows Original

It means that that area has lower pressure then the air around it.

When there is a Low above your house, you should expect cloudy skies and maybe even rain or snow! The way I remember it is that a Low will make me feel low because "bad" weather is on the way...