WEATHER

By: Jimmy Burgard

What is evaporation?

• evaporation is the process by which water changes from a liquid to a gas or vapor.

• if you put an ice cube on the ground in the summer it will melt and then it will evaporate.

• The higher temperature the more evaporation

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What is condensation?

• Condensation is the accumulation of water vapor changing to liquid water onto a surface.

• Condensation occurs whenthe temperature of any surface falls belowthe dew point.

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What is precipitation?

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• Precipitation is also part of the hydrologic cycle.

• You’ve already learned that the main forms of precipitation are rain, hail, snow, sleet, and freezing rain.

http://ellerbruch.nmu.edu/classes/cs255f02/cs255students/abarker/P4/watercycle.html

What causes rain?

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• Warm air can hold more water than cool air, so when the warmer air is cooled the moisture condenses to liquid - and it rains.

Cirrus clouds

• cirrus clouds are the highest in elevation.

• Form above 20,000 feet.

• the temperature at that elevation is so cold that cirrus clouds are usually composed of ice crystals.

• This can only happen when the temperatures reach below -38 degrees Celsius.

http://ellerbruch.nmu.edu/classes/cs255f02/cs255students/abarker/P4/cirrus.html

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Cumulus clouds

• cumulus clouds are probably the most recogonized clouds out of all of the cloud types.

• cumulus clouds appear so fluffy because bubbles of air called thermals, linger in the cloud making it have this kind of look.

• cumulus clouds form below 6,000 feet.

• But in some extreme cases they can be in altitudes as high as 39,000 feet.

http://ellerbruch.nmu.edu/classes/cs255f02/cs255students/abarker/P4/cumulus.html

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Stratus clouds

• stratus clouds are uniformed layered clouds that are below 6,000 feet.

•They can form only a few hundred feet above ground.

• they are shallow but cover a large area and they can bring precipitation.

• stratus clouds are more known for drizzle than for precipitation

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The four seasons in order

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• spring9.

• summer10.

•Fall 11.

• winter12.

The four types of precipitation

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Rain

• rain occurs when warm air rises, cools, condenses.

• the dew point is reached, the air becomes saturated and water droplets fall from the clouds.

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Snow

• snow occurs when the air temperature is below freezing.

• water droplets freeze and fall as snow flakes.

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Sleet

• sleet forms when the water droplets fall and freeze before they reach the surface of the earth.

• the temperature of the clouds are above freezing.

• the temperature close to the earth surface is below freezing.

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Hail

• hail forms in high level clouds where the temperature is below freezing.

• the water droplets in the clouds freezes.

• the surface temperature of the earth is above freezing.

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maritime

Air masses Type of land air symbol

Form over water / ocean Wet air m

polar

Continental Form over land Dry air c

Form in the north Cold air P

Tropical Form in the south Warm air T

arctic Very cold A 18.

High + low pressure

Type of pressure type of weather

High pressure Nice weather

Low pressure Worse weather

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Front- A boundary between two different air masses is called a front.

Pressure- Atmospheric pressure is determined by the temperature and density of the air and the amount of water vapor in it.

Precipitation- Storms and precipitation occur at fronts.

Temp- Fronts usually bring a chance in temperature.

Direction- Fronts always bring a chance in wind direction.

Air mass- A air mass is a large body of air with the same properties as earth’s surface under it.

Isotherm- A line connecting points of equal temperature is a isotherm.

Station model- A station model shows the weather conditions at one specific location.

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What is the dew point?

What is sleet?

What is fog?

What is humidity?

What is wind?

What is relative humidity?

What is weather?

What is temperature?

What are clouds?

What are types of precipitation?

What is caused by the interaction of air, water, and sun?

The temperature at which condensation forms from saturated air.

Rain drops that pass through a layer of freezing air near Earth’s surface forming pellets.

A stratus cloud that forms near the ground.

The amount of water vapor in the air.

Air moving in a specific direction.

The measurement of the amount of water vapor in the air compared to the amount needed for saturation at a specific temperature.

A description of the current state of the atmosphere.

A measure of the average of motion of molecules.

Objects that form as warm air rises, expands, and then it cools.

Rain, snow, sleet, and hail.

The weather.

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