weather weathering the weather whether the weather be fine or whether the weather be not whether the...
Post on 21-Dec-2015
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WeatherWeatherWeathering the WeatherWeathering the Weather
Whether the weather be fineWhether the weather be fineOr whether the weather be Or whether the weather be
notnotWhether the weather be coldWhether the weather be coldOr whether the weather be Or whether the weather be
hothotWe’ll weather the weatherWe’ll weather the weather
Whatever the weatherWhatever the weatherWhether we like it or notWhether we like it or not
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What is weather?What is weather?
Weather is the state of the atmosphere Weather is the state of the atmosphere at a specific place and time.at a specific place and time.
It is what is happening outside right now.It is what is happening outside right now. A few miles or a few minutes can change A few miles or a few minutes can change
the weather.the weather.
At any given time, the weather is fair in At any given time, the weather is fair in some places, while it rains or snows in some places, while it rains or snows in othersothers
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What is the weather like today?What is the weather like today?
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Why is weather important?Why is weather important?
The weather affects our lives every The weather affects our lives every day. day.
It can have an impact on what type of It can have an impact on what type of clothing we wear and how we spend clothing we wear and how we spend our free time. our free time.
Weather also affects agriculture, Weather also affects agriculture, transportation, and industry. transportation, and industry.
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TemperatureTemperature Humidity Humidity Cloud Formation Cloud Formation Air Pressure Air Pressure Wind Direction & SpeedWind Direction & Speed
What factors affect weather?What factors affect weather?
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TemperatureTemperature
The sun warms the earth’s surface and The sun warms the earth’s surface and therefore all the air above the surfacetherefore all the air above the surface
TemperatureTemperature - measure of how hot or - measure of how hot or cold the air is. cold the air is.
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Remember, temperature is the Remember, temperature is the average motion (kinetic energy) of average motion (kinetic energy) of molecules, so…molecules, so…– high movement of molecules = high movement of molecules =
high temperature (hot)high temperature (hot)– low mlow movement of molecules = ovement of molecules =
low temperature (cold)low temperature (cold)
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HumidityHumidity
Humidity –Humidity – the amount of water the amount of water vapor in the airvapor in the air
Would you go to the beach on a hot, humid day, or a cool, crisp day?
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– Absolute humidityAbsolute humidity – measure of – measure of how much water vapor the air is how much water vapor the air is capable of holding. The hotter the capable of holding. The hotter the air is, the more moisture it can holdair is, the more moisture it can hold
– Relative humidityRelative humidity – measure of – measure of how much moisture there is actually how much moisture there is actually in the air – expressed as percentage in the air – expressed as percentage of absolute humidityof absolute humidity
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Cloud FormationCloud Formation
With cold air, molecules move slower With cold air, molecules move slower so droplets of water can start to stick so droplets of water can start to stick together and form clouds - together and form clouds - condensationcondensation
Clouds form when water vapor Clouds form when water vapor condenses on dust particles in the aircondenses on dust particles in the air
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Types of CloudsTypes of Clouds
CumulusCumulus – White, tall and puffyWhite, tall and puffy– Definite base, and Definite base, and
look like cotton ballslook like cotton balls
StratusStratus
– flat shapes flat shapes – stack up in layersstack up in layers– low level and cover low level and cover
most of the skymost of the sky
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CirrusCirrus– Thin curves with no clear Thin curves with no clear
shape found high in the shape found high in the skysky
– wispy, feathery cloudswispy, feathery clouds– made of ice crystalsmade of ice crystals
CumulonimbusCumulonimbus– tall, puffy, and graytall, puffy, and gray– may bring thunder and may bring thunder and
lightning.lightning.
There are many more types of clouds. Basic There are many more types of clouds. Basic categories are used to classify them. Their categories are used to classify them. Their names combined to form over 10 different cloud names combined to form over 10 different cloud types.types.
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Air PressureAir Pressure
Air pressure is the weight of the air Air pressure is the weight of the air pushing downpushing down
High pressure – cool air descends toward High pressure – cool air descends toward the Earth’s surface. the Earth’s surface. – Usually means clear sunny daysUsually means clear sunny days
Low pressure – warm air rises upward into Low pressure – warm air rises upward into the atmosphere the atmosphere – Usually means high humidity, clouds, Usually means high humidity, clouds,
rainrain
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Looking at a weather map, you’ll notice the Looking at a weather map, you’ll notice the air masses constantly moving around.air masses constantly moving around.
The boundaries of these areas are called The boundaries of these areas are called frontsfronts
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WindWind
Air moves from areas where air Air moves from areas where air pressure is relatively high to areas pressure is relatively high to areas where air pressure is relatively low. where air pressure is relatively low. This movement of air is what we call This movement of air is what we call wind.wind.
Winds are measured by direction and Winds are measured by direction and speedspeed
A wind chill is the A wind chill is the cooling in cooling in temperatures that the wind causestemperatures that the wind causes