Weather Topic 7

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WeatherTopic 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
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Weather Variables
Include temperature, air pressure, wind, moisture
conditions, cloud cover, precipitation, and storms
teachers.saschina.org/aolivas/
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Troposphere
The part of the atmosphere immediately above the
Earths surface. Where most of the weather
changes occur
http//www.fas.org/irp/imint/docs/rst/Sect14/atmos
phere.jpg
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Atmospheric Pressure and Density
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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/B
arometricPressure_Map.jpg
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Barometers
Instrument used to measure air pressure
http//www.maximum-inc.com/images/products/product
s/PRA-LE.jpg
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Isobars
Used to show air pressure on weather maps
http//www.newmediastudio.org/DataDiscovery/Hurr_E
D_Center/Hurr_Structure_Energetics/Closed_Isobars/
Closed_Isobars_fig02.jpg
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Wind
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Air Pressure Gradient
The difference in air pressure for a specific
distance
http//www.physicalgeography.net/fundamentals/imag
es/thermal2.GIF
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Anemometer
Instrument used to measure wind speed
http//wings.avkids.com/Book/Wright/Images/anemom-
Bertie.jpg
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General Circulation of the Air in the Troposphere
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Jet Streams
Bands of easterly moving air at the top of the
troposphere
http//wings.avkids.cohttp//nevis.k12.mn.us/acade
mics/science/2jetstreams.gifm/Book/Wright/Images/a
nemom-Bertie.jpg
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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?imgurlhttp//www.
grossmont.edu/judd.curran/images/A07_14.gifimgref
urlhttp//www.grossmont.edu/judd.curran/outline2.
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Monsoons
Extreme weather changes caused by the shifting
wind and pressure belts
http//staff.harrisonburg.k12.va.us/cwalton/My20
Pictures/monsoons.jpg
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Atmospheric Moisture
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Water Vapor
Gaseous water in the atmosphere
http//helloworldbea.files.wordpress.com/2008/05/w
atervapor.jpg
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Humidity
General term that refers to the water vapor
content of the atmosphere
http//www.electrical-res.com/EX/10-19-03/humidity
.jpg
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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.g
if
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Dew Point
The temperature at which air is filled with water
vapor
http//virtualskies.arc.nasa.gov/weather/tutorial/
images/27humiddew.gif
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Psychrometer
Instrument used to measure relative humidity
http//upload.wikimedia.org/wikipedia/commons/0/09
/Sling_psychrometer.JPG
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Precipitation
The falling of liquid or solid water from clouds
toward the surface of Earth
http//www.windows.ucar.edu/earth/images/precipita
tion.gif
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Cloud Cover
The fraction or percent of the total sky at a
location that is covered by clouds
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Atmospheric Transparency
How transparent the atmosphere is to insolation
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Visibility
How far you can see along Earths surface
expressed in miles
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Air Masses and Fronts
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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
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Cyclones
Have low pressure
http//www.mynews.in/News/dailyimage/news/cyclone-
-430--1.jpg
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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/atmo
sphere/weather/cold_front.jpg
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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?imgurlhttp//www.
physicalgeography.net/fundamentals/images/warmfron
t.GIFimgrefurlhttp//www.physicalgeography.net/f
undamentals/7r.htmlusg__csBKCc0ogNKYd8c7lPrpD1VD
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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?imgurlhttp//www.
physicalgeography.net/fundamentals/images/warmfron
t.GIFimgrefurlhttp//www.physicalgeography.net/f
undamentals/7r.htmlusg__csBKCc0ogNKYd8c7lPrpD1VD
D00h325w594sz27hlenstart7um1itbs1t
bnidICEirI7Rq4Em3Mtbnh74tbnw135prev/images
3Fq3Doccluded2Bfront26um3D126hl3Den26safe
3Dactive26rlz3D1T4GZAZ_enUS316US31726tbs3Disch
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