But what exactly is pressure? What is a pressure system? And why should anyone care? The difference between high and low pressure is sometimes the difference between sunshine and downpours.

A low pressure system moved into the Great ... The cooler temperatures will not be lasting very long. A high pressure system ...

They are examples of extreme low pressure systems. Hurricanes often occur at the start of the American summer from end of June until October. For cyclones to occur and develop, the sea temperature ...

as it moves from high to low pressure in effort to try and restore balance in air pressure. The stronger and closer these pressure systems are, the faster the wind speed. But if the pressure ...

As a weak high pressure ridge continues to build, temperatures slowly warm through Friday. Cooler for the weekend.

A low pressure system is expected to move east ... PHOENIX - Isolated rain showers have been passing from north to south over the high terrain of northern and eastern Arizona on Saturday afternoon.