Large masses of air, as much as a thousand miles across, take on certain weather characteristics when they stay at high latitudes (near the poles) or at low latitudes (near the equator) for several days at a time. They may be very cold or very warm, or they may be very humid or very dry. Then, as they move into other areas, they can affect the weather there very strongly.
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US National Weather Service Burlington VT - Time for another Weather Knowledge Wednesday! Today we'll learn about fronts. Fronts occur at the boundary between two of different density, and thus usually of
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