Clouds and Precipitation PowerPoint

By, Brittani Swavely

http://

aumusiclibrary.wordpress.com/

2011/02/28/rain-helens-picks-for-a-

rainy-afternoon/

http://www.weatherreport.com/

Local-weather-forecasts-Cloud-

Reading.asp

Adiabatic Temperature Changes and Expansion and Cooling

• Adiabatic temperature changes are temperature changes that even happen even though the heat isn’t added or subtracted.

• Dry adiabatic rate is the cooling or heating in unsaturated air.

• Wet adiabatic rate is the rate of adiabatic cooling in saturated air and always slower then the dry adiabatic rate.

http://apollo.lsc.vsc.edu/classes/

met130/notes/chapter6/

adiab_cool.html

Orographic Lifting

• The air occurs when there are elevated terrains, such as mountains, they act like barriers to air flow, which forces the air to ascend.

http://en.wikipedia.org/

wiki/

File:Orographic_lifting_of_

the_air_-_NOAA.jpg

Frontal Wedging

• Fronts are boundaries between colliding masses of the warm and cold air.

• Frontal Wedging is a process which occurs at a front which is cold, dense air that acts as a barrier which is warmer, less dense air rises.

http://

www.geo.hunter.cu

ny.edu/~tbw/

wc.notes/

4.moisture.atm.stab

ility/

frontal_wedging.ht

m

Convergence

• It’s the lifting of the air that results from the air in the lower atmosphere flowing together.

https://www.meted.ucar.edu/sign_in.php?go_back_to=http%253A%252F%252Fwww.meted.ucar.edu%252Ffire%252Fs290%252Funit6%252Fprint_2.htm

Localized Convective Lifting

• Occurs when there is unequal heating of the Earth’s warms a pocket of the air more then surrounding air, hen lowering the air pocket’s density.

https://

www.meted.uc

ar.edu/

sign_in.php?

go_back_to=htt

p%253A%252F

%252Fwww.me

ted.ucar.edu

%252Fdot

%252Fprint.htm

Stability (Density Differences & Stability and Daily Weather)

• When there are most stable conditions happen when the air temperature actually increases with the height , is called temperature inversion.

http://ocw.usu.edu/

Forest__Range__and_Wildlife_Sc

iences/

Wildland_Fire_Management_an

d_Planning/

Unit_7__Atmospheric_Stability_

and_Instability_1.html

Condensation

• Condensation nuclei occurs in the air above ground, with tiny bits of particulate matter.

• The surfaces serve as water-vapor condensation.

• Examples: fog, dew or clouds.

http://www.kidsgeo.com/geography-for-kids/0107-condensation.php

Types of Clouds

• One type of cloud is Cirrus which are clouds high, white and thin. These clouds can occur in patches or in like sheets or extended wispy fibers often have a feathery appearance.

• Another type of cloud is Cumulus which are clouds that consist of a rounded individual cloud masses. They usually have a flat base and a appearance of rising domes or towers.

• The third type of cloud is Stratus which is when these clouds are described as sheets or layers that cover most if not all of the sky. Can be minor breaks but, no distinct individual cloud units.

http://

www.weatherquestions.co

m/What_kinds_of_clouds_are

_there.htm

High Clouds• Three types of clouds that make up the family,

the three types are cirrus, cirrostratus, and cirrocumulus.

• All of these types are thin, white and often made up of ice crystals.

• Not considered precipitation makers.http://www.123rf.com/

photo_7745352_silver

-clouds-an-unusual-

occurrence-around-

the-white-nights-very-

high-clouds-are-shone-silver-

light-.html

Middle Clouds

• They appear in the middle range from about 2000-6000 meters.

• Altocumulus clouds are formed from rounded masses that are different from cirrocumulus

http://braindanceisawayoflife.blogspot.com/2009/04/cloudspotters-guide.html

Low Clouds

• There are three members in this family and they are stratus, stratocumulus, and nimbostratus.

• These clouds can produce light precipitation.• Nimbostratus clouds form during good

conditions.

http://www.atmos.illinois.edu/earths_atmosphere/clouds.html

Clouds of Vertical Development

• Some clouds don’t fit into any category.• They are all basically related to each other.• Cumulonimbus clouds can produce rain

showers or thunderstorms.

http://www.pilotfriend.com/av_weather/meteo/clouds.htm

Fog(by cooling and by evaporation)• There is nothing different from a cloud an fog.• The appearance between a cloud and fog are

the same.• Fog can sometimes form on cool, clear , calm

nights when the Earth’s surface cools a lot by radiation.

http://epod.usra.edu/blog/2006/03/advection-fog-in-new-hampshire.html

Cold Cloud Precipitation(Bergeron process)

• Water that is in the liquid state below 0 degrees celeuis is told to be supercooled.

• Water that is supercooled will rapidly freeze if it does touch a solid object.

http://photoblog.statesman.com/author/rbarrera

Warm Cloud Precipitation (collision-coalescence process)

• When the air is saturated which means 100% relative humidity , respects to be water is supersaturated with respect of the ice which is greater then 100% humidity.

• Collision-coalescence is the theory of the raindrop formation in warm clouds, which has larger cloud droplets.

http://quizlet.com/1781977/chp-18moisture-clouds-and-precipitation-flash-cards/

Rain and Snow

• The term rain mean drops of water that falls from a clod.

• Snow is made up of individual ice crystals that have six sides.

• The snowflakes are heavy and has high moisture.

http://zahiym5tlc.edublogs.org/

Sleet , Glaze and Hail

• Sleet is small particles of ice.• Hail produces from cumulonimbus clouds.• Glaze can be known as freezing rain.

http://weathersavvy.com/A-Winter.html

The end