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