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WINDS Responsible for triggering the initial movement of air.

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Presentation on theme: "WINDS Responsible for triggering the initial movement of air."— Presentation transcript:

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2 WINDS

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4 Responsible for triggering the initial movement of air.

5 CORIOLIS EFFECT SHIFT IN WIND DIRECTION DUE TO EARTH’S ROTATION

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7 What happens if pressure is the same? No wind!

8 Earth’s Winds- due to uneven heating  pressure differences

9 Local Winds Land breeze Sea breeze

10 LOCAL WINDS SEA BREEZE LAND BREEZE Uneven heating of land vs water

11 Earth’s Winds- due to uneven heating  pressure differences Local Winds Land breeze Sea breeze Seasonal Winds- over bigger region (ex-SE Asia) monsoon

12 MONSOONS Similar to land and sea breeze bit occur over a wider area SEASONAL WINDS

13 Philippines Northeast Monsoon (cold and wet) Southwest Monsoon (dry)

14 Global/Planetary Winds Earth’s Winds- due to uneven heating  pressure differences Local Winds Land breeze Sea breeze Seasonal Winds- over bigger region (ex-SE Asia) monsoon

15 GLOBAL WINDS UNEQUAL HEATING equater vs. poles results in GLOBAL PATTERN OF AIR CIRCULATION

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17 ctive_art/global_winds/index.html

18 Earth’s Winds- due to uneven heating  pressure differences Local Winds Land breeze Sea breeze Seasonal Winds- over bigger region (ex-SE Asia) monsoon Global/Planetary Winds Prevailing Westerlies Polar Easterlies Trade Winds Jet Stream Up In Atmosphere On Surface

19 TRADE WINDS ON SURFACE: AIR MOVING BACK TO THE EQUATOR FORMING A BELT OF WARM, STEADY WINDS

20 PREVAILING WESTERLIES ON SURFACE degrees Latitude (West to East) Strong Winds

21 POLAR EASTERLIES ON SURFACE COLD BUT WEAK WINDS EAST TO WEST

22 JET STREAMS IN ATMOSPHERE (ABOVE 12 KMS) Km/Hr (speed) “rivers of air"

23 Earth’s Winds- due to uneven heating  pressure differences Local Winds Land breeze Sea breeze Seasonal Winds- over bigger region (ex-SE Asia) monsoon Global/Planetary Winds Prevailing Westerlies Polar Easterlies Trade Winds Jet Stream NO Winds Doldrums Horse Latitudes On Surface Up In Atmosphere

24 DOLDRUMS ON SURFACE CALM/ NO WINDS AT EQUATOR (0 degrees latitude)

25 HORSE LATITUDES ON SURFACE 30 degrees North and South of Equator Warm air cools and sink; clear skies; winds are calm

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27 ctive_art/global_winds/index.html

28 CORIOLIS EFFECT SHIFT IN WIND DIRECTION DUE TO EARTH’S ROTATION

29 As air moves from high to low pressure:highlow in north, air deflected right/ counterclockwise in the south, air is deflected left/clockwise

30 hurricanes/typhoons and tornadoes spin COUNTER-CLOCKWISE in NORTH

31 Flushing Toilets on the Equator Myth or Real: Toilets flushed in the northern hemisphere apparently spin to the right, in the southern hemisphere the water spins left - - this is supposedly caused by the Coriolis effect. And on the equator? It's a straight shot down. myth

32 BREAK TIME One big/important idea or fact Stand up Share with 3 people

33 So how do we get differences in pressure?

34 All factors making Low density & low pressure 1) temp: Warm air is less dense than cool air. REMEMBER THE OPPOSITE IS ALSO TRUE

35 DIFFERENCES IN DENSITY DIFFERENCE IN AIR PRESSURE EX) HOT temp (LESS dense)=> LOW P COLD temp (MORE dense)=> HIGH P UNEQUAL HEATING OF AIR

36 TEMPERATURE AND AIR PRESSURE HEAT Air molecules move faster and expand less dense LESS AIR PRESSURE Air RISES

37 All factors making Low density  low pressure 1) temp: Warm air is less dense than cool air. 2) humidity: Moist air is less dense than dry air. REMEMBER THE OPPOSITE IS ALSO TRUE

38 More water vapor means less air molecules LOW AIR PRESSURE DRY AIR  more dense = HIGH AIR PRESSURE Less dense =

39 All factors making Low density  low pressure 1) temp: Warm air is less dense than cool air. 2) humidity: Moist air is less dense than dry air. 3) elevation: Air at high altitudes (mountains) is less dense than air at lower altitudes. REMEMBER THE OPPOSITE IS ALSO TRUE

40 Air at high altitudes is more spread out = less dense than air at lower altitudes.

41 Measuring Air Pressure Air Pressure is measured by an instrument called Barometer 2 Main Types of Barometer  Mercury Barometer  Aneroid (spring)

42  Air pressure increases, column of mercury rises  Air pressure decreases, column of mercury drops Video (minute 2): gGBMCqBoSE&feature=relatedhttp://www.youtube.com/watch?v=- gGBMCqBoSE&feature=related VIDEO: Why use mercury?Why use mercury?

43 Break time Think of one fact you learned from the video or what you found interesting Stand up Form groups based on the same idea

44 CLOUDS

45 TYPES OF CLOUDS

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47 CLOUD FORMATION 1) WATER VAPOR (gas) rising (need heat to cause evaporation) 2) CONDENSATION NUCLEI (smoke, dust, pollution) 3)LOW TEMPERATURE for condensation (liquid) to occur

48 MOISTURE CONDENSES ON SMALL PARTICLES OF DUST/ SOLIDS IN THE AIR

49 CONDENSATION WATER VAPOR CHANGES INTO LIQUID (need cold temp)

50 DEW POINT TEMPERATURE AT WHICH water vapor CONDENSES

51 Source:

52 Air Pressure & Weather

53 TEMPERATURE AND AIR PRESSURE HEAT Air molecules move faster and expand less dense LESS AIR PRESSURE Air RISES What happens when air rises?

54 Low pressure generally means cloudy, rainy weather Warm air rises, clouds form

55 High pressure generally means fair weather Layer of Air Warm, moist air cannot rise =No clouds

56 Weather map Low pressure system: Increased cloudiness, winds, higher temperatures, and chance of precipitation. High Pressure System: Indicates clear, calm conditions with reduced chance of precipitation. DRY and COLDER air

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58 Frost Formation Cold temperature causes water vapor (gas) to instantly freeze (solid) Skips liquid phase (never wet) Salt helped to make colder

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60 Source: When condensed water gathers into drops that are heavy enough, precipitation occurs

61 Cloud droplets Snow Ice PRECIPITATION

62 Hurricanes/Typhoons/Cyclones & Tornadoes

63 Hurricanes/typhoons/cyclones- what’s in a name? LOCATION, LOCATION, LOCATION

64 HOW?

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66 hurricanes/typhoons and tornadoes spin COUNTER-CLOCKWISE in NORTH H H H H

67 4/28/severe.wea ther/index.html? hpt=T2 n.com/2011/US /04/27/tornado. outbreak/index. html?hpt=T1 Experts: Severe weather across South could set tornado record

68 11/04/28/us/map-of-the-tornadoes- across-the-south.html Including yesterday's storm, there have been a whopping 800 reports of tornadoes in April, easily surpassing April 2003's all-time record of 543 twisters. there have been a whopping 800 reports of tornadoes in April

69 /ts_yblog_thelookout/watch- tuscaloosas-terrifying-tornado Yahoo video clips Tornadoes Song: com/watch?v=iOw6 ONcKk4g com/watch?v=iOw6 ONcKk4g


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