High pressure is settling in for the weekend, and if you like sunshine, that’s a good thing. On the other hand, if you are concerned over the fact that most of North Carolina has slipped back into a moderate drought, it’s a bad thing. You’re probably well aware after a lifetime of watching the weather forecast that high pressure means fair weather and low pressure typically means storms, but do you know just what causes high and low pressure?

Have you ever wondered just what a high pressure system is?  We hear the phrase regularly when listening to a weather forecast, but how many people understand what causes high pressure versus low pressure?  What about a blizzard?  Does having a blizzard mean several feet of snow falling in a short time, or is there a more precise definition?