chapter 9: weather factors section 5: precipitation clouds
TRANSCRIPT
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Chapter 9: Weather Chapter 9: Weather FactorsFactors
Section 5: Precipitation clouds
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PrecipitationPrecipitationPrecipitation – any form of water that falls
from clouds and reaches Earth’s surface
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PrecipitationPrecipitationNot all clouds produce
precipitation.For precipitation to occur, cloud
droplets or ice crystals must grow heavy enough to fall through the air.
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Types of PrecipitationTypes of Precipitation
RainSleet Freezing rainSnowHail
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Types of PrecipitationTypes of Precipitation
Rain – most common kind of precipitation ◦At least 0.5 millimeters◦Smaller drops of water are called
drizzle.Sleet – solid particles of ice
◦Smaller than 5 millimeters◦As raindrops fall they pass through a
layer of air below 0 ºC and freeze into these ice particles.
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Types of PrecipitationTypes of Precipitation
Freezing rain – raindrops that freeze when they touch a cold surface.◦Does not freeze in the air◦A thick layer of ice builds up on every
surface
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Types of PrecipitationTypes of Precipitation
Snow – Water vapor in a cloud that is converted directly into ice crystals◦Snowflakes have an endless number of
different shapes and patterns all with six sides or branches
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Types of PrecipitationTypes of Precipitation
Hail – round pellets of ice larger than 5 millimeters in diameter
Only forms in cumulonimbus clouds during thunderstorms
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Modifying PrecipitationModifying PrecipitationCloud Seeding – tiny crystals of silver
iodide and dry ice are sprinkled into the clouds from airplanes.
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Measuring Precipitation Measuring Precipitation Snowfall Measurement
◦A measuring stick◦Melting collected snow
Measuring the depth 10 centimeters of snow contains about the
same amount of water as 1 centimeter of rain
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Measuring Precipitation Measuring Precipitation Rain Measurement
◦Rain Gauge – an open-ended can or tube that collects rainfall
◦Measured by dipping a ruler into the water or reading a marked scale