precipitation chapter 16 section 5 november 29, 2007 t-4 hannah, steven, gabby, robbie
TRANSCRIPT
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Precipitation
• Chapter 16 section 5• November 29, 2007 T-4• Hannah, Steven, Gabby, Robbie
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Vocabulary
• Precipitation: Is any form of water that falls from clouds and reaches Earth’s surface.
• Drought: Is a water shortage caused by long periods of low precipitation in a particular area.
• Rain Gauge: Is an open-ended can or tube that collects rainfall.
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Rain
• Is drops of water that are at least 0.5 millimeters in diameter.
• Is the most common form of precipitation
• It is measured in a rain gauge.
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Sleet
• Is raindrops falling through a layer of air below 0 degrees Celsius. As they fall, the raindrops freeze into particles of ice.
• Ice particles smaller than 5 millimeters in diameter is sleet.
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Freezing Rain
• Is raindrops that freeze when they touch a cold surface instead of freezing when they touch the ground.
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Hail• Are round pellets of ice
larger than 5 millimeters in diameter.
• Hail is only formed in cumulonimbus clouds during thunderstorms.
• During the thunderstorm strong updrafts carry the ice pellet up and down cold regions.
• Each time it passes a cold region a layer of ice is formed around it until it is heavy enough to fall.
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Snow
• Is water vapor in clouds that is directly converted into ice crystals or snowflakes.
• Snow is measured in a rain gauge.
• Every snowflake has 6 sides and is unique.
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Measuring Precipitation• Meteorologists measure
precipitation with rain gauges.
• A rain gauge is an open ended can or tube that collects precipitation.
• To measure how much precipitation is in a can put a ruler in it.
• For more precipitation add a funnel, that gives you ten times more of a certain kind of precipitation. When measuring it for accuracy divide by 10.
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Controlling Precipitation
• When droughts occur airplanes sprinkle dry ice (solid carbon dioxide.) and silver iodide into clouds.
• Water vapor in the clouds condenses the particles of silver iodide forming rain or snow.
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Georgia’s Drought
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5 Facts About Georgia’s Drought
• The drought in Georgia is a level 4• Atlanta Georgia is 15 inches below their normal
precipitation .• There is about a three-month supply of water left
in Lake Lanier.• Atlanta Georgia is down to a 90 day supply of
water. • The drought responds to all counties in the north,
such as Muscogee, Spalding, and Lincoln counties.
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What Must Happen Before Precipitation can Fall To The
Ground
Cloud droplets or ice crystals must grow heavy enough.