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The reasonable weather explanations that separate you and me from the folks poking out of the cave are part of the modern knowledge specialty of meteorology, which is the five-dollar word for the science of weather and climate. That’s what this book is all about. Weather scientists know the answers now to the basic questions about the changes that take place in the sky and plenty more. Already you know more than you probably think you do about the weather. Phrases like “low-pressure system” and “high-pressure ridge” have become familiar, even if not so well understood. And images from space satellites of enormous arms and blotches of cloudiness slowly swirling over the surface of Earth appear on television screens and on our smartphones as familiar as the faces of friends. Already you are ahead of people who wondered about the weather some 60 years ago before the satellites went into orbit and made the great size of storms so obvious. So even before you tackle the details of the comings and goings in the air over your head, some congratulations are in order. In most times past, when people wondered about the weather, they were scared to death. They were frightened by the storms, and when they asked questions about them, they were frightened by the answers they got. If I told you it was the magic of the witch doctor, or the fact that the gods are angry, now you would laugh at me. You and I have come a long way, baby. There is no right way to read this book, and no wrong way to read it either. You can read it straight through from the first page to the last, but you don’t need to. You don’t need to read Chapter 1, for example, to get a grip on the subjects covered in Chapter 2. Browse through it or start anywhere you like. If there’s something about how weather happens that’s been bugging you, just jump in and check it out. (Why the sky is blue is explained in Chapter 15, for example.) Weather For Dummies is your ready reference on the subject.