Download - Weather
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Have you ever just looked Have you ever just looked at clouds?at clouds?
Why do we have Why do we have clouds?clouds?
Why are there Why are there different different shapes?shapes?
What can they What can they tell us about the tell us about the weather?weather?
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Take Good Notes!Take Good Notes!
There will be There will be a quiz on a quiz on this this informationinformation
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Understanding CloudsUnderstanding Clouds
Clouds form as Clouds form as warm air is warm air is forced upwardforced upward
As the air is As the air is forced upward, forced upward, it expands and it expands and coolscools
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Understanding CloudsUnderstanding Clouds
As the air cools, As the air cools, the relative the relative humidity humidity reaches 100%reaches 100%
For more information on For more information on Relative Humidity click Relative Humidity click ☼
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Water vapor begins to condense Water vapor begins to condense in tiny drops around nuclei. in tiny drops around nuclei. Nuclei are small particles of Nuclei are small particles of dust, salt, and smoke in the dust, salt, and smoke in the
atmosphereatmosphere
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Cloud TypesCloud Types
There are There are many many different different cloud typescloud types
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Cloud TypesCloud Types Can you think Can you think
of the two of the two main ways main ways that clouds that clouds are classified?are classified?
ShapeShape, , HeightHeight, and , and sometimes sometimes RainRain CapacityCapacity
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By Shape!By Shape! There are three main cloud There are three main cloud types that are based on shapetypes that are based on shape
Think you know any of them?Think you know any of them?
StratusStratus CumulusCumulus CirrusCirrus
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Stratus CloudsStratus Clouds Stratus Stratus
clouds form clouds form a smooth, a smooth, even sheeteven sheet
They usually They usually form at low form at low altitudesaltitudes
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Stratus CloudsStratus Clouds
When air is When air is cooled and cooled and condenses near condenses near the ground, a the ground, a stratus cloud stratus cloud know as _______ know as _______ formsforms
Know the name?Know the name?
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Cumulus CloudsCumulus Clouds These are These are
masses of masses of puffy, white puffy, white clouds, often clouds, often with flat baseswith flat bases
They form They form when air when air currents risecurrents rise
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Cumulus CloudsCumulus Clouds They can be They can be
associated associated with both fair with both fair weather weather and…….when and…….when they get they get really tall ___!really tall ___!
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Thunderstorms!Thunderstorms!
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Cirrus CloudsCirrus Clouds Cirrus clouds Cirrus clouds
are high, thin, are high, thin, white, white, feathery feathery clouds clouds containing containing ice ice crystalscrystals
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Cirrus CloudsCirrus Clouds Cirrus clouds Cirrus clouds
are usually are usually associated associated with fair with fair weather, but weather, but they may they may indicate indicate approaching approaching stormsstorms
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By HeightBy Height The prefix of cloud names can The prefix of cloud names can
describe the height of cloud describe the height of cloud basesbases
Cirro: High clouds above Cirro: High clouds above 6000m6000m
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By HeightBy Height
Alto: Middle elevation clouds Alto: Middle elevation clouds between 2000 to 6000mbetween 2000 to 6000m
Strato: Low level clouds below Strato: Low level clouds below 2000m2000m
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Rain CloudsRain Clouds NimbusNimbus
clouds are clouds are dark clouds dark clouds associated associated with with precipitationprecipitation
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Rain CloudsRain Clouds When a nimbus When a nimbus
cloud is also a cloud is also a towering towering cumulus cloud, cumulus cloud, it’s called a it’s called a cumulonimbus cumulonimbus cloudcloud
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Ready for a quick review?Ready for a quick review?
1. Clouds can form when the 1. Clouds can form when the relative humidity reaches ____relative humidity reaches ____%%
2. In order for clouds to form, 2. In order for clouds to form, water vapor begins to water vapor begins to condense around ____of dust, condense around ____of dust, salt, and smokesalt, and smoke
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3. Clouds are classified by ____ 3. Clouds are classified by ____ and____ and sometimes rain and____ and sometimes rain capacitycapacity
4. Puffy, white clouds are called?4. Puffy, white clouds are called? 5. Mid elevation clouds between 5. Mid elevation clouds between
2000 and 6000m2000 and 6000m
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Let’s see how you did!Let’s see how you did!
1.1. 100100
2.2. NucleiNuclei
3.3. Shape and heightShape and height
4.4. CumulusCumulus
5.5. AltoAlto
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Forms of Forms of PrecipitationPrecipitationPrecipitation (pre-sip-uh-Precipitation (pre-sip-uh-tay-shun) is any form of tay-shun) is any form of water that falls to the water that falls to the Earth's surfaceEarth's surface. .
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Types of PrecipitationTypes of Precipitation
The type of precipitation that The type of precipitation that falls to the ground depends falls to the ground depends upon the formation process upon the formation process and the temperatures of the and the temperatures of the environment between the environment between the cloud and the surfacecloud and the surface
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Can you name the Can you name the different types of different types of
precipitation?precipitation? RainRain SnowSnow HailHail SleetSleet
Freezing RainFreezing Rain
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RainRain Rain develops when Rain develops when growing cloud droplets growing cloud droplets become too heavy to become too heavy to
remain in the cloud and remain in the cloud and as a result, fall toward the as a result, fall toward the
surface as rainsurface as rain
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Rain can also Rain can also begin as ice begin as ice crystals that crystals that collect each collect each other to form other to form large large snowflakessnowflakes
As the falling As the falling snow passes snow passes through the through the freezing level freezing level into warmer into warmer air, the flakes air, the flakes melt melt
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Rain from snow!Rain from snow!
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SnowSnow
Snow is formed when ice Snow is formed when ice crystals form from water crystals form from water vapor that is in the clouds vapor that is in the clouds directly above your heads!directly above your heads!
This process is called This process is called sublimationsublimation
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HailHail Hail is formed Hail is formed
when updrafts when updrafts carry raindrops carry raindrops upwards into upwards into extremely cold extremely cold areas of the areas of the atmosphereatmosphere
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HailHail There the There the
raindrops raindrops merge and merge and freeze. When freeze. When the frozen the frozen clumps get to clumps get to heavy they fall heavy they fall to earthto earth
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HailHail Hail can vary Hail can vary
in size, from in size, from the size of a the size of a small stone to small stone to that of a that of a baseball! baseball! So So be carefulbe careful
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SleetSleet Sleet is frozen raindrops. Sleet is frozen raindrops.
Sleet begins as rain or snow Sleet begins as rain or snow and falls through a deep and falls through a deep layer of cold air that layer of cold air that contains temperatures contains temperatures below freezing that exist below freezing that exist near the surfacenear the surface..
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SleetSleet Rain that falls Rain that falls
through this through this extremely extremely cold layer has cold layer has time to freeze time to freeze into small into small pieces of icepieces of ice
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Freezing RainFreezing Rain Freezing rain is falling rain that Freezing rain is falling rain that
cools below 0°C, but does not cools below 0°C, but does not turn to ice in the air turn to ice in the air
The water is “The water is “supercooledsupercooled””
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When the drops hit anything When the drops hit anything they instantly turn to ice!they instantly turn to ice!
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1.1. Nuclei for the formation of rain Nuclei for the formation of rain drops can be small particles of: drops can be small particles of: A) salt, B) smoke, C) dust, D) all A) salt, B) smoke, C) dust, D) all the abovethe above
2.2. Which of these cloud types is not Which of these cloud types is not based on the clouds shape: A) based on the clouds shape: A) stratus, B) nimbus, C) cumulus, stratus, B) nimbus, C) cumulus, D) cirrusD) cirrus
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33. Mid elevation clouds between . Mid elevation clouds between 2000 and 6000m: A) nimbus, 2000 and 6000m: A) nimbus, B) alto, C) cirro, D) stratoB) alto, C) cirro, D) strato
44. This form of precipitation is . This form of precipitation is supercooled: A) rain, B) snow, supercooled: A) rain, B) snow, C) sleet, D) freezing rainC) sleet, D) freezing rain
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5.5. This form of precipitation This form of precipitation stays frozen all the way to the stays frozen all the way to the ground: A) rain, B) snow, C) ground: A) rain, B) snow, C) sleet, D) freezing rainsleet, D) freezing rain
Let’s see how you did!Let’s see how you did!
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The Answers!The Answers!
1. D1. D
2. B2. B
3. B3. B
4. D4. D
5. B5. B
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HumidityHumidity and and RelativeRelative Humidity Humidity
HumidityHumidity is the amount of is the amount of water vapor in the airwater vapor in the air
Relative humidityRelative humidity is a measure is a measure of the amount of water vapor of the amount of water vapor that the air is holding, that the air is holding, compared to the amount it can compared to the amount it can hold at a specific temperaturehold at a specific temperature
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HumidityHumidity and and RelativeRelative Humidity Humidity
When the air is holding as When the air is holding as much moisture as it can, it’s much moisture as it can, it’s said to be said to be saturatedsaturated
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Can you explain this graph?Can you explain this graph?
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In the cool of the morning, the In the cool of the morning, the air can’t hold as much air can’t hold as much moisture. We often have moisture. We often have dew dew on a summer morningon a summer morning
Once the air has warmed, the Once the air has warmed, the relative humidity drops since relative humidity drops since the air can hold more moisturethe air can hold more moisture
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You’ve seen water on the You’ve seen water on the outside of a cold drink?outside of a cold drink?
The cold air The cold air around the around the glass causes a glass causes a lower lower temperature at temperature at which the air is which the air is saturatedsaturated
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You’ve seen water on the You’ve seen water on the outside of a cold drink?outside of a cold drink?
The The temperature temperature at which air is at which air is saturated and saturated and condensation condensation takes place is takes place is the the dew pointdew point
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