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HumidityThe amount of water vapor in the air.

Relative Humidity: How much water a parcel of air is capable of holding. Changes with temperature Warm Air can hold more waterCold Air is capable of holding less water

When air is full of water we call it saturated.

What is a Parcel:Think balloon containing air

Dew PointTemperature air needs to be cooled to until it can hold no more water

At this point water will condense

On the right stuff this condensation of water forms cloudsWater Droplets Require Condensations NucleiUsually dust, dirt, aerosol particles

When lifted, cold air reaches its dew point faster than warm air.

Dew RainCloud Condensation RainCartoon

How do clouds form?1st Step: We Need Condensation Nuclei2nd Step: Air Needs to Be LiftedWhats that?Something for water droplets to condense on.Usually dust, dirt, aerosol particles

Moist Air Rises and Expands but needs to be forced upward so it can cool down enough to hit its dew point.

Most Common: 1). Lifted Over A MountainOrographic Lifting2). Frontal WedgingMeeting a very different air mass

Somehow.we need to get air to riseOrographic Lifting: Mountain is more dense,So the air rises over.

Frontal WedgingMeeting a very different air mass; body of air.

We know cold air is very dense, so warm air is forced up and over.

Dry adiabatic cooling rate *10C/1000 mAir only stops cooling at this rate when it hits its dew point and begins to condense.

6Types of cloudsHeight Descriptions = PrefixesShape = 2nd half1). Cirro: Very High Clouds

2). Alto: Middle Clouds

3). Strato: Low Clouds

Cirrus: Thin Wispy like hair

Cumulus: Big Puffy/ Lumpy CloudsCotton Balls

Stratus: Continuous Cloud Nimbus = Storm Cloud

Cloud Videoshttp://www.youtube.com/watch?v=velxZEWhrDo

http://www.youtube.com/watch?v=mZnmQ0mnTnU&feature=fvwrel

Cloud Matching gamehttp://eo.ucar.edu/webweather/cloudmatch.html

Identify that cloud

CirrusIdentify that cloud

CirrocumulusIdentify that cloud

CirrostratusIdentify that cloudAltostratus

Identify that cloudAltocumulus

Identify that cloud

StratocumulusIdentify that cloud

CumulonimbusIdentify that cloud

StratonimbusOptionsElectromagnetic Spectrum Web Quest: http://missionscience.nasa.gov/ems/01_intro.html

Layers of the Atmosphere/Methods of Heat Transferhttp://www.windows.ucar.edu/tour/link=/earth/Atmosphere/layers.html

Question of the DayWhat is convection?How is convection related to weather?

FogWhen the dew point of water vapor is reached close to the surface; clouds forming on Earths surface.

Advection Fog: Happens during the morning hoursHorizontal movement of warm moist air from over water to land where temperatures are cooler.

Radiation Fog: happens on cool/clear nightsHeat escapes from Earth vertically; lost to space. Earth cools down so that air can reach its dew point at the surface.

Types of stabilityStable AtmosphereUnstable AtmosphereAir is sinking; high pressure

Clouds are thin or not presentAir is rising; low pressure

Clouds tallIntense Precipitation possibleSevere storms possible

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