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CLOUDS AND PRECIPITATION
PROJECTBy: Michael Hilliard
-Adiabatic temp changes
Happens when air is compressed or expanded
When expands it cools and when it compresses it warms
As you travel father up in the atmosphere the atmosphere pressure decreases because there are fewer and fewer gas molecules http://www.bio.georgiasouthern.edu/
bio-home/harvey/lect/lectures.html?flnm=abel&ttl=Introduction&ccode=rm&mda=scrn
-Orographic Lifting
Large land masses (mountains) block air Form clouds and rain Air goes up mountain http://www.waterencyclopedia.com/Ce-Cr/Climate-
Moderator-Water-as-a.html
Frontal Wedging
Masses of warm and cold air collide Associated with specific storm called
middle latitude cyclones Cooler denser air acts as a barer
http://www.geo.hunter.cuny.edu/~tbw/wc.notes/4.moisture.atm.stability/frontal_wedging.htm
Convergence
Air flows together in lower atmosphere results in lifting
Forming clouds Mid afternoon thunderstorms when solar
heat is addedhttp://www.tetration.org/Tetration/Convergence/index.html
Localized convective lifting
Pockets of air warmed more than others Rising thermals Great for hang gliding Make clouds mid afternoon rain showers
https://www.meted.ucar.edu/sign_in.php?go_back_to=http%253A%252F%252Fwww.meted.ucar.edu%252Fnorlat%252Fsnow%252Flake_effect%252Fprint_whole.htm
stability
As air rises temps drop Denser air sink to original spot Stable air results vertical movements
http://dowwolff.custhelp.com/app/answers/detail/a_id/2387/~/polyox-storage-stability,-bulk-polymer-and-tablets
condensation
Water vapor in air changes to a liquid Must be a surface to condense on-
condensation nuclei for air dew Occurs at dew point
http://decorating.visitacasas.com/how-to-combat-condensation/
Types of Clouds
Classified by their form and height. Three types cirrus, cirromulus,
Cirrostratus.
http://cloudjournal.blogspot.com/2007/11/cross-winds.html
High Clouds
Cirromulus consist of fluffy mass Cirrostratus clouds are flat layers
http://cloudjournal.blogspot.com/2007_11_01_archive.html
Middle Clouds
Altocumulus clouds consist of a rounded mass, larger and denser
http://en.wikipedia.org/wiki/File:Altocumulus_clouds2_-_NOAA.jpg
Low Clouds
Three members Stratus, Stratocumulus, and nimbostratus
Uniform,fog-like layer
http://forums.canadiancontent.net/science-environment/76416-invasion-bubble-clouds.html
Clouds of vertical Development
Bases in low height rang but extend upward all related and have unstable air
All related and unstable air
http://www.free-online-private-pilot-ground-school.com/Aviation-Weather-Principles.html
Fog
No physical deferens between fog and a cloud
Forms from radiation cooling or movement of air over a cool surface
Also forms when water vapor is added to cause saturation
http://photoshoptutorials.ws/photoshop-tutorials/photo-effects/fog.html
Clouds of Vertical Development
Pure water droplets- Which don’t freeze until -40 c
Upward movement triggers acceleration
http://www.free-online-private-pilot-ground-school.com/Aviation-Weather-Principles.html
Warm cloud persipatashon
Water absorbing partials takes water vapor from air
Large droplets collide with small droplets
https://www.meted.ucar.edu/sign_in.php?go_back_to=http%253A%252F%252Fwww.meted.ucar.edu%252Fhydro%252Fbasic_int%252Fflash_flood%252Fnavmenu.php%253Ftab%253D1%2526page%253D2.2.2
Rain and snow
Rain is- droplets that fall from the cloud that have a diameter of .05 mm
Snow forms in-between 4c and -5c degrease
http://ofb.net/~niniane/rainsnow/
Sleet glaze and hail
Sleet is the fall of small particles of clear ice
Glaze also known as freezing rain happens when raindrops become supercooled
http://www.kidsgeo.com/geography-for-kids/0118-freezing-rain.php
The End
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