Upload
brooke-crawford
View
234
Download
0
Tags:
Embed Size (px)
Citation preview
Chapter 3Chapter 3The Changing The Changing
WeatherWeather
Chapter 3 TermsChapter 3 Terms
CondensationCondensation
Orographic Orographic CondensationCondensation
Convectional Convectional CondensationCondensation
Frontal CondensationFrontal Condensation
High Pressure SystemHigh Pressure System
Low Pressure SystemLow Pressure System
ClimateClimate
Precipitation
Weather
Air Masses
Continental Artic
Maritime Tropical
Maritime Polar
Front
Ocean Currents
Gulf Stream
Labrador Current
Weather Radar Stations
Meteorologists
Radiosonde
Conditions leading to Conditions leading to CondensationCondensation
SnowSnowSnow forms Snow forms when water when water vapour vapour condenses at a condenses at a temperature temperature below the below the freezing pointfreezing point
Read pp. 33 - 36
Snow Snow StormStorm
For a For a snowstorm to snowstorm to happen – it happen – it needs two needs two things…things…Snow Snow WindWind
Low & High Pressure Low & High Pressure SystemsSystems
Low Pressure System – Air rising over a warm surface
High Pressure System – Cool air sinks towards the surface, pushing the air underneath away
Why we get wind…Why we get wind…
Air over the North and South Poles sink, because it is cold, Air over the North and South Poles sink, because it is cold, producing an area of high pressureproducing an area of high pressure
Air over the equator rises because it is hot, producing an area Air over the equator rises because it is hot, producing an area of low pressureof low pressure
The earth rotates on its axis once every day, so that a point on The earth rotates on its axis once every day, so that a point on the equator travels approximately 40000 km in 24 hours – a the equator travels approximately 40000 km in 24 hours – a velocity of nearly 1700km/hrvelocity of nearly 1700km/hr
Winds in the northern hemisphere blow counterclockwise into Winds in the northern hemisphere blow counterclockwise into a low pressure area and clockwise out of a high pressure areaa low pressure area and clockwise out of a high pressure area
An area between high and low pressure feels the effects of An area between high and low pressure feels the effects of both circulationsboth circulations
High winds can develop when areas of very high and very low High winds can develop when areas of very high and very low pressure come close togetherpressure come close together
Questions… Page 37 #’s 1 - 4
Factors which affect Factors which affect ClimateClimate
Climate – average conditions of temperatureClimate – average conditions of temperature
Precipitation – rain, snow, humidity, pressure Precipitation – rain, snow, humidity, pressure and windand wind
Weather – conditions of the atmosphere over Weather – conditions of the atmosphere over a short period of timea short period of time
They can all be demonstrated on a They can all be demonstrated on a climate graph…climate graph…
Climate Climate GraphGraph
Consists of…Consists of…Temperature – on Temperature – on left of graph – shown left of graph – shown by a line graphby a line graphPrecipitation – on Precipitation – on right of graph – right of graph – shown by a bar graphshown by a bar graphMonths of the year – Months of the year – on bottom of graphon bottom of graph
Climate Graph Assignment
Factors which influence Factors which influence the climate in Atlantic the climate in Atlantic
CanadaCanada Latitude – because of the shape of the earth’s surface, there Latitude – because of the shape of the earth’s surface, there
are parts of Atlantic Canada which receive more intense are parts of Atlantic Canada which receive more intense sunshine than otherssunshine than others
Air Masses – affect the climate because they take on the Air Masses – affect the climate because they take on the temperature and humidity characteristics of the areas in temperature and humidity characteristics of the areas in which they originatewhich they originate
Ocean Currents – the waters of the world’s oceans are Ocean Currents – the waters of the world’s oceans are constantly in motion. Tides move the water up and down constantly in motion. Tides move the water up and down while currents move water from place to place. The major while currents move water from place to place. The major ocean currents have considerable influence on climate.ocean currents have considerable influence on climate.
Proximity to Water – Areas very close to large bodies of water Proximity to Water – Areas very close to large bodies of water stay cooler in summer and warmer in winter than areas inlandstay cooler in summer and warmer in winter than areas inland
Elevation – As height increases, temperatures decrease, Elevation – As height increases, temperatures decrease, largely because air is so much thinner at high altitudeslargely because air is so much thinner at high altitudesRead pp. 37 – 41
Questions…Page 42
Examining Examining WeatherWeather
Land & Sea – weather Land & Sea – weather observers note and observers note and transmit information transmit information about the state of the about the state of the atmosphereatmosphereFrom the Air – use From the Air – use radar to detect, locate radar to detect, locate and measure the and measure the amount of amount of precipitation in cloudsprecipitation in cloudsFrom Space – From Space – weather satellites are weather satellites are used to make long-used to make long-term weather term weather forecastsforecasts
Weather Radar Station
Read pp. 43 – 45, Questions…Page 46Read pp. 46 – 47, Questions…Page 48