Air Masses:Air Masses: A large body of A large body of air with the same temperature air with the same temperature and moisture throughout.and moisture throughout.

Air formed over warm Air formed over warm water is warm and moist.water is warm and moist.

Air formed over land in Air formed over land in north is cold and dry.north is cold and dry.

Four different surface Four different surface conditions that form air conditions that form air masses.masses.

Air over land = Air over land = DryDry

Air over water = Air over water = MoistMoist

Air near poles = Air near poles = ColdCold

Air near equator = Air near equator = WarmWarm

High & Low Pressure SystemsHigh & Low Pressure Systems

High pressure systems bring High pressure systems bring clear, skies, dry weather and clear, skies, dry weather and gentle winds. gentle winds. COLD AIRCOLD AIR

Low pressure systems bring Low pressure systems bring cloudy, wet weather, with strong cloudy, wet weather, with strong gusty winds. gusty winds. WARM AIRWARM AIR

FrontsFronts: When one air When one air mass comes in contact with mass comes in contact with another, the boundary another, the boundary between them is called a between them is called a front. Often producing front. Often producing clouds, strong winds, and clouds, strong winds, and precipitation. precipitation.

TYPESTYPES OFOF FRONTS:FRONTS:

ColdCold FrontFront :: cold air mass cold air mass pushes under a warm air mass. pushes under a warm air mass. Bring heavy rain, gusty winds, Bring heavy rain, gusty winds, and cooler temperatures.and cooler temperatures.

WarmWarm FrontFront: : warm air mass warm air mass pushes under cold air mass. Bring pushes under cold air mass. Bring light rain lasting a few days and light rain lasting a few days and warmer temperatures.warmer temperatures.

StationaryStationary FrontFront..When a warm or cold front stops When a warm or cold front stops moving. These type of conditions moving. These type of conditions can last for days. can last for days. Temperatures remain stagnant and winds are gentle to nil.

OccludedOccluded FrontFront: : the cold front the cold front over takes the warm front. The over takes the warm front. The weather is not as extreme weather is not as extreme

ForecastingForecasting An attempt to An attempt to predict future weather. predict future weather.

Decrease in air pressure = Decrease in air pressure = stormystormy weather. While increase in air weather. While increase in air

pressure = fair weather. pressure = fair weather.

Increase in clouds front is coming.Increase in clouds front is coming.

WeatherWeather: : Consist of Atmosphere, Consist of Atmosphere, Temperature, Humidity, Precipitation, Temperature, Humidity, Precipitation, Wind, and Cloud CoverWind, and Cloud CoverAtmosphereAtmosphere: : Consist of the gas part of Consist of the gas part of earthearthTroposphereTroposphere: : Layer of atmosphere that Layer of atmosphere that we live in an most weather takes place we live in an most weather takes place in.in.StratosphereStratosphere: : increase in temp. with increase in temp. with increase in altitude red color. increase in altitude red color. MesosphereMesosphere: : decrease in temp. with decrease in temp. with increase in altitude.increase in altitude.ThermosphereThermosphere: Outer most layer of : Outer most layer of atmosphereatmosphereTemperatureTemperature: Amount of heat in the air : Amount of heat in the air Air PressureAir Pressure: Measured with barometer, : Measured with barometer, as temperature increases air pressure as temperature increases air pressure decreasesdecreases

HumidityHumidity: is the amount of water vapor is the amount of water vapor in the airin the airWindWind: Movement of air.Movement of air. Measured with a Measured with a hygrometer.hygrometer.PrecipitationPrecipitation: any form of water any form of water that falls to earth (rain, sleet, snow, that falls to earth (rain, sleet, snow, hail)hail)ClimateClimate: Average weather of an area Average weather of an area over a period of time.over a period of time.LatitudeLatitude: distance from equator.distance from equator. AltitudeAltitude: height above sea level. Cooler height above sea level. Cooler temperatures at higher altitudes then temperatures at higher altitudes then lower.lower.

Latent Heat:Latent Heat: Hidden heat. Water has a Hidden heat. Water has a high latent heat that is why areas near high latent heat that is why areas near large bodies of water have cooler large bodies of water have cooler summers and warmer winters.summers and warmer winters.Air Masses:Air Masses: A large body of air with the A large body of air with the same temperature and moisture same temperature and moisture throughout.throughout.Continental:Continental: Air formed over continents Air formed over continents is dryis dryMaritime:Maritime: Air formed over water is wet Air formed over water is wetFronts:Fronts: When one air mass comes in When one air mass comes in contact with another air masscontact with another air mass

Cold FrontCold Front:: cold air mass pushes under cold air mass pushes under a warm air mass. Bring heavy rain, gusty a warm air mass. Bring heavy rain, gusty winds, and cooler temperatures.winds, and cooler temperatures.Warm Front:Warm Front: warm air mass pushes warm air mass pushes under cold air mass. Bring light rain under cold air mass. Bring light rain lasting a few days and warmer lasting a few days and warmer temperatures.temperatures.