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Weather 7

Weather Describes the conditions in the atmosphere at a specific time/place
What causes weather? The uneven heating of the earth by the suns rays
In what layer does weather mostly occur in? Troposphere
Air Temperature- The amount of heat energy in the atmosphere at a place
Air Pressure- The amount of force exerted by the air hitting a given surface area
Humidity- The amount of water vapor in the air
Wind speed- The rate of moving air
Wind direction- The direction that the wind blows from
Precipitation - Falling moisture from the clouds
Instrument to measure air pressure Barometer
Instrument to measure humidity Sling Psychrometer
Instrument to measure wind speed Anemometer
Instrument to measure wind direction Wind Vane
Instrument to measure precipitation Rain Gauge
Condensation Water going from a gas to a liquid (looses energy)
Evaporation Water going from a liquid to gas (gains energy)
Transpiration Evaporation of water from/out of plants
What is wind caused by Differences in air pressure
Hot air ________ Rises
Cool air ______ Sinks
Low pressure= Hot air rises
Cold air sinks= High pressure
Large difference in air pressure= Strong winds
Small difference in air pressure= Weak winds
Coriolis Effect Wind appears to curve to the right in the northern hemisphere
What causes the Coriolis Effect? Earths rotation
Dew Point The temperature at which water vapor condenses out of the air bc the air is saturated
How do clouds form? When the air is cooled to the dew point and water condenses into tiny water droplets
How does precipitation occur? Once the water droplets get too large they fall
Dark clouds mean what type of precipitation(usually)? Storms/precipitation
Cirrus High wispy clouds
Cumulus Low puffy clouds
Cumulonimbus Tall dark thunderstorm clouds
Stratus Flat low clouds (gloomy)
Field map A region of space that has a measurable quantity or value at every point
Isolines Lines with the same field value
Isobars Lines of equal air pressure
Isotherm Lines of equal temperature
As latitude increases temperatures __________ Decreases
An air mass that forms over water would be dry or moist? Moist
An air mass that is over land would be dry or moist? Dry
Air Mass Air with generally uniform characteristics
Source region Surface over which an air mass forms
Front The boundary (on the ground) between 2 air masses
Arctic(A) Formed over extremely cold, ice covered regions
Polar(P) Formed over regions of high latitudes where temperatures are usually low
Tropical(T) Formed over regions of low latitudes where the temperatures are usually high
Maritime(M) Formed over water, moist
mP Cold moist Formed over North Atlantic and North Pacific
mT Warm,moist Formed over guild of Mexico, middle Atlantic, Caribbean, Pacific
Continental Formed over land, dry
cA Dry frigid Formed North of Canada
cP Cold dry Formed over northern and central Canada
Ct Warm dry Formed over southwestern US in summer
5 air masses Arctic Polar Tropical Maritime Continental
Cold front symbol Triangles pointing towards where it's heading
Weather during a cold front: Strong storms
Weather after the cold front Cold Dry
Air masses typically move from _______ to _______ west to east
Weather before cold front Warm Humid
Warm front symbol Circles facing the way the front is moving
Weather before warm front Cold
Weather during warm front Wet Rainy
Weather after warm front Warm Humid
What is a cyclone Inward and counterclockwise air circulation around a low pressure center
What is a hurricane? Huge cyclonic storms (low pressure system) that form in the summer over warm ocean water
How do winds blow around a hurricane? Counterclockwise around the center
What fuels a hurricane and gives it power? The sun
Wind blows from _____ pressure to ______ pressure High to low
Climate Long term behavior of atmosphere
Layers of the atmosphere (from outer to inner) Exosphere,ionosphere,mesosphere,stratosphere,thermosphere,tro-posphere
Relative humidity Measure of the amount of moisture in the air compared to what the air could hold (how full of water the air is)
100% relative humidity = Precipitation is occurring
Created by: CJ120