Weather Topic 7 Created by P. Bordas MS, CCC- SLP Remember to wait for the vocabulary word to pop up at the end! Can you guess it before it comes up?
Mar 28, 2015
Weather
Topic 7
Weather
Topic 7
Created by P. Bordas MS, CCC-SLP
Remember to wait for the vocabulary word to pop up at the end! Can you guess it before it comes up?
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/judd.curran/images/A07_14.gif&imgrefurl=http://www.grossmont.edu/judd.curran/outline2.htm&usg=__4EzI0dKYxO5-4b5Agt0poS3Hl3c=&h=258&w=411&sz=26&hl=en&start=12&um=1&itbs=1&tbnid=MmWjuknAdEitVM:&tbnh=78&tbnw=125&prev=/images%3Fq%3Dplanetary%2Bwind%2Bbelts%26um%3D1%26hl%3Den%26safe%3Dactive%26rlz%3D1T4GZAZ_enUS316US317%26tbs%3Disch:1
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.JPG
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?imgurl=http://www.physicalgeography.net/fundamentals/images/warmfront.GIF&imgrefurl=http://www.physicalgeography.net/fundamentals/7r.html&usg=__csBKCc0ogNKYd8c7lPrpD1VDD00=&h=325&w=594&sz=27&hl=en&start=1&um=1&itbs=1&tbnid=ICEirI7Rq4Em3M:&tbnh=74&tbnw=135&prev=/images%3Fq%3Dwarm%2Bfront%26um%3D1%26hl%3Den%26safe%3Dactive%26rlz%3D1T4GZAZ_enUS316US317%26tbs%3Disch:1
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://www.physicalgeography.net/fundamentals/images/warmfront.GIF&imgrefurl=http://www.physicalgeography.net/fundamentals/7r.html&usg=__csBKCc0ogNKYd8c7lPrpD1VDD00=&h=325&w=594&sz=27&hl=en&start=7&um=1&itbs=1&tbnid=ICEirI7Rq4Em3M:&tbnh=74&tbnw=135&prev=/images%3Fq%3Doccluded%2Bfront%26um%3D1%26hl%3Den%26safe%3Dactive%26rlz%3D1T4GZAZ_enUS316US317%26tbs%3Disch:1