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Ascending/Descending
Air masses ,[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object]
How depressions form ,[object Object],[object Object],[object Object],[object Object],[object Object]
Ascending Descending Low Pressure   High Pressure Depression  / Cyclone / Lows Anticyclone  / Highs Oval / lowest at centre Oval / large / highest at centre Strong winds Light winds Close isobars Wide isobars Blow to centre (anticlockwise) Blow away from centre (clockwise)  Lots cloud Clear skies Lots rain Dry weather
Depression - Anticyclone
Cycle of a depression ,[object Object],[object Object],[object Object],[object Object],[object Object]
http://www.classzone.com/books/earth_science/terc/content/visualizations/es2002/es2002page01.cfm?chapter_no=visualization  (animation) http://www.school-portal.co.uk/GroupDownloadFile.asp?File=39951
Can you identify the cold air mass in this satelite photo? This is what these fronts would look like on a weather map on TV.
Remember…. ,[object Object],[object Object]
Irish depressions ,[object Object],[object Object],[object Object]
[object Object],[object Object]

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Ascending / Descending air