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EES 108 Class 24

EES 108 Class 24 - Fronts and Cyclones Anticyclones Clear...

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Fronts and Cyclones Anticyclones:  Clear, calm weather Descending, stable air Convergence aloft Divergence at surface High pressure at surface Cyclones:  Storms, precipitation Ascending, unstable air Divergence aloft Convergence at surface Low pressure at surface Weather forecasting: Where are the cyclones? How strong are they? Where are they going? Polar front theory (1919-25) Vilhelm Bjerknes (1862-1951) Jakob Bjerknes (1897-1975) Halvor Solberg Tor Bergeron (1891-1977) Vilhelm Bjerknes (1862-1951) Jakob Bjerknes (1897-1975)
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Basic idea: Fronts Boundaries that separate  different air masses Air masses are generally high-pressure Fronts occur near  low-pressure regions Military metaphor: Who’s overrunning whom?
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Midlatitude Cyclone
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Cold Fronts and Warm Fronts  
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EES 108 Class 24 - Fronts and Cyclones Anticyclones Clear...

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