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Justin Snow of the Indianapolis Colts stands in a snowstorm during a National Football League game on Sunday Winter weather has returned to northern areas of the world. Steel CastingIn much of the United States, winter means the return of snow. Snow is a subject of great interest to weather experts. Experts sometimes have difficulty estimating where, when or how much snow will fall. One reason is that heavy amounts of snow fall in surprisingly small areas. Another reason is that a small change in temperature can mean the difference between snow and rain.
VOICE TWO: Snow is a form of frozen water. It contains many groups china phoneof tiny ice particles called snow crystals. These crystals grow from water particles in cold clouds. They usually grow around a piece of dust. All snow crystals have six sides, but they grow in different shapes.china mobile phone The shape depends mainly on the temperature and water levels in the air. Snow crystals grow in one of two designs -- platelike and columnar. Platelike crystals are flat. They form when the air temperature is about fifteen degrees below zero Celsius. Columnar snow crystals look like sticks of ice. They form when the temperature is about five degrees below zero.
VOICE ONE: The shape of a snow crystal may change from one form to cheap phonesanother as the crystal passes through levels of air with different temperatures. When melting snow crystals or raindrops fall through very cold air, they freeze to form small particles of ice, called sleet. Groups of frozen water droplets are called snow pellets. Under some conditions, these particles may grow larger and form solid pieces of ice, or hail.
(MUSIC) VOICE TWO: When snow crystals stick together, they produce snowflakes.unlocked phone Snowflakes come in different sizes. As many as one hundred crystals may join together to form a snowflake larger than two and one-half centimeters. Under some conditions, snowflakes can form that are five centimeters long. Usually, this requires near freezing temperatures, light winds and changing conditions in Earth's atmosphere. Snow contains much less water than rain. About fifteen centimeters of wet snow has as much water as two and one-half centimeters of rain. About seventy-six centimeters of dry snow equals the water in two and one-half centimeters of rain.
VOICE ONE: Much of the water we use comes from snow. Melting r4i dsi snow provides water for rivers, electric power centers and agricultural crops. In the western United States, mountain snow provides up to seventy-five percent of all surface water supplies. Snowfall helps to protect plants and some wild animals from cold, winter weather. Fresh snow is made largely of air trapped among the snow crystals. Because the air has trouble moving, the movement of heat is greatly reduced. Snow also is known to influence the movement of sound waves. When free shippingthere is fresh snow on the ground, the surface of the snow takes in, or absorbs, sound waves. However, snow can become hard and flat as it becomes older or if there have been strong winds. Then the snow's surface will help to send back sound waves. Under these conditions, sounds may seem clearer and travel farther.
VOICE TWO: Generally, the color of snow and ice appears white. This is becausecheap wedding dresses the light we see from the sun is white. Most natural materials take in some sunlight. This gives them their color. However, when light travels from air to snow, some light is sent back, or reflected. Snow crystals have many surfaces to reflect sunlight. Yet the snow does take in a little sunlight. It is this light that gives snow its white appearance. Sometimes, snow or ice may appear to be blue. The blue light is thecheap wedding dresses product of a long travel path through the snow or ice. In simple terms, think of snow or ice as a filter. A filter is designed to reject some substances, while permitting others to pass through. In the case of snow, all the light makes it through if the snow is only a centimeter thick. If it is a meter or more thick, however, blue light often can be seen.
(MUSIC) VOICE ONE: Snow falls in extreme northern and southern areas of the world throughout the year. However, the heaviest snowfalls have been reported in the mountains of other areas during winter. These areas include the Alps in Italy and Switzerland,Mother of the Bride Dresses the coastal mountains of western Canada, and the Sierra Nevada and Rocky Mountains in the United States. In warmer climates, snow is known to fall in areas over four thousand nine hundred meters above sea level. A December storm left heavy snow to clear off a sidewalk in Omaha, Nebraska VOICE TWO: