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Weather
Topic 7
Remember to wait for the vocabulary word to pop up at the end! Can you
guess it before it comes up?
Created by P. Bordas MS, CCC-SLP
Weather Variables
Include temperature, air pressure,
wind, moisture conditions, cloud cover,
precipitation, and storms
teachers.saschina.org/aolivas/
Troposphere
The part of the atmosphere
immediately above the Earth’s surface.
Where most of the weather changes
occur
http://www.fas.org/irp/imint/docs/rst/Sect14/atmosphere.jpg
Atmospheric
Pressure and
Density
Atmospheric Pressure
(or barometric pressure or air pressure)
The pressure due to the weight of the
overlying atmosphere pushing down on
any given area
http://www.mercarta.com/desktop/map/GulfOfMexico/BarometricPressure_Map.jpg
Barometers
Instrument used to measure air
pressure
http://www.maximum-inc.com/images/products/products/PRA-LE.jpg
Isobars
Used to show air pressure on weather
maps
http://www.newmediastudio.org/DataDiscovery/Hurr_ED_Center/Hurr_Structure_Energetics/Closed_Isobars/Closed_Isobars_fig02.jpg
Wind
Air Pressure Gradient
The difference in air pressure for a
specific distance
http://www.physicalgeography.net/fundamentals/images/thermal2.GIF
Anemometer
Instrument used to measure wind
speed
http://wings.avkids.com/Book/Wright/Images/anemom-Bertie.jpg
General
Circulation of the
Air in the
Troposphere
Jet Streams
Bands of easterly moving air at the top
of the troposphere
http://wings.avkids.cohttp://nevis.k12.mn.us/academics/science/2jetstreams.gifm/Book/Wright/Images/anemom-Bertie.jpg
Planetary Wind Belts
Results because of the Coriolis effect (winds moving
away from high air pressure and deflected to the
right in the Northern Hemisphere and to the left in
the Southern Hemisphere). Within these, the winds
move generally in a specific direction much of the
time so they are prevailing winds.
http://images.google.com/imgres?imgurl=http://www.grossmont.edu/jud
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Monsoons
Extreme weather changes caused
by the shifting wind and pressure
belts
http://staff.harrisonburg.k12.va.us/~cwalton/My%20Pictures/monsoons.jpg
Atmospheric
Moisture
Water Vapor
Gaseous water in the atmosphere
http://helloworldbea.files.wordpress.com/2008/05/watervapor.jpg
Humidity
General term that refers to the
water vapor content of the
atmosphere
http://www.electrical-res.com/EX/10-19-03/humidity.jpg
Relative Humidity
The ratio of the amount of water
vapor in the air (absolute humidity)
to the maximum amount it can
hould (its moisture capacity)
http://www.tqnyc.org/2009/00767/relativehumidity.gif
Dew Point
The temperature at which air is
filled with water vapor
http://virtualskies.arc.nasa.gov/weather/tutorial/images/27humiddew.gif
Psychrometer
Instrument used to measure
relative humidity
http://upload.wikimedia.org/wikipedia/commons/0/09/Sling_psychrometer.JP
G
Precipitation
The falling of liquid or solid water
from clouds toward the surface of
Earth
http://www.windows.ucar.edu/earth/images/precipitation.gif
Cloud Cover
The fraction or percent of the total
sky at a location that is covered by
clouds
Atmospheric Transparency
How transparent the atmosphere is
to insolation
Visibility
How far you can see along Earth’s
surface expressed in miles
Air Masses and
Fronts
Air Mass
A large body of air in the
troposphere with similar
characteristics of pressure,
moisture and temperature
http://www.kidsgeo.com/images/air-masses.jpg
Cyclones
Have low pressure
http://www.mynews.in/News/dailyimage/news/cyclone--430--1.jpg
Cold Front
The boundary of an advancing
cold air mass and a warmer air
mass, where the underlying cold
air pushes forward like a wedge
http://www.uwsp.edu/geo/faculty/ritter/images/atmosphere/weather/cold_front.jpg
Warm Front
The boundary of an advancing warm air
mass and retreating wedge of cooler air
mass. The cooler air is heavier, the
warm air mass is forced to rise as it
advances
http://images.google.com/imgres
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Occluded Front
Boundary of opposing wedges of
cold air masses formed when a
cold front overtakes a warm front,
lifting the warm air mass off the
ground
http://images.google.com/imgres?imgurl=http://w
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