Watching the sky can be peaceful or exciting, depending on the day or hour. Sometimes the sky is as still as a painting with snow-white clouds on a deep blue canvas. At other times ragged clouds race across the sky, propelled by high winds aloft. Sky-watching may take us on flights of fancy or lead us to ponder why the wind blows, or how clouds take such different shapes, or what wind and clouds can tell us about the weather.
Winds, or flowing air currents, are caused by warm air rising and cool air flowing in to take its place. Because the sun heats the Earth unequally, the atmosphere is heated unequally too, warming and rising in some parts, cooling and sinking in others. This creates areas of low pressure, where the air has Continue reading Wind and Clouds Aloft – Background