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Unformatted text preview: hich atmospheric moisture returns the Earth’s surface Forms of precipitation: rain, hail, snow, Forms and sleet and How precipitation forms How Forms Forms based on two mechanisms: 1) ice crystal process and 2) collisioncrystal coalescence process Rain/drizzle Rain/drizzle Rain: Rain: Drops of water that fall from a cloud that have a diameter of 0.002 inch that Drizzle: Fine, uniform drops of water that Drizzle: have a diameter less than 0.002 inch have Most rain originates from nimbostratus Most clouds or in towering cumulonimbus clouds clouds Drizzle are produced from stratus or Drizzle nimbostratus clouds nimbostratus Snow Snow Snow: Snow: Precipitation in the form of ice crystals crystals Light, fluffy snow is produced when the air Light, temperature very low (23oF or lower) temperature Heavy snow is produced when air Heavy temperature are above 23oF. Has a high temperature F. moisture content moisture Sleet Sleet Sleet: Sleet: small ice particles which are clear and translucent and Hail Hail: Hail: precipitation in the form of hard, rounded pellets or irregular clumps of ice rounded Hail is produced only in large, Hail cumulonimbus clouds, where there is an abundant supply of supercooled water abundant Measuring precipitation Measuring Rain: Rain: Can be measured by using a standard rain gauge standard Snow: Measured based on depth and Snow: water equivalent water...
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- Fall '10