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BC Weather

BC Weather. Clouds. Simply a form of condensation As hot air rises it cools and condenses As more water droplets join together we get clouds Forms of Clouds Cirrus, Cumulus, Stratus, Nimbostratus, Cumulonimbus. Air Pressure.

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BC Weather

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  1. BC Weather

  2. Clouds • Simply a form of condensation • As hot air rises it cools and condenses • As more water droplets join together we get clouds • Forms of Clouds • Cirrus, Cumulus, Stratus, Nimbostratus, Cumulonimbus

  3. Air Pressure • Air Pressure: pressure exerted by a weight of a column of air – kpa • Air pressure at sea level is 1kg/cm2 • A desk that is 50cm/100cm would have an air pressure exceeding 5000kg (same as a bus) – why doesn’t that desk break? • Air pressure is exerted up, down and sideways – air pressure is matched on all sides

  4. Low Pressure

  5. Low Pressure/High Pressure • Cyclone = Low Pressure • Counter-clockwise in the Northern Hemisphere and clockwise in the South • Anti-cyclone = High pressure • Clockwise in N.Hemi and counter in S.Hemi • ***Winds equalize pressure in the hemisphere – winds travel from areas of high pressure to areas of low pressure

  6. Jet Stream • High speed air current with winds up to 500km/h and 2-5km wide • Travels west to east and brings warm Pacific air and water to the BC coast

  7. Jet Stream

  8. Air Masses • Classified by a two-letter code • 1st = surface origin – m = maritime; c = continental • 2nd = latitude/temp (capitalized) – P = polar; A = Arctic; T = tropical • We usually get a mP or cP • Unless we get a Pineapple Express – which is mT

  9. Fronts • Fronts – boundary surfaces that separate air masses of different densities • Warm Front – warm air occupies the area formally covered by cool air • Cold Front – cool cP air enters an area of warm air – violent weather systems • Occluded Front – combination of warm/cold fronts

  10. Warm Front

  11. Cold Front

  12. Weather Maps

  13. Weather • http://www.youtube.com/watch?v=wOsICmp4eFo • http://www.youtube.com/watch?v=43VoMesUd2Q • http://www.youtube.com/watch?v=kYUpkPTcqPY • http://www.youtube.com/watch?v=4f45jA5UxB0 • http://www.youtube.com/watch?v=s76Qn7bpCsQ

  14. Katrina from Space

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