EESA09H3 Lecture : EESA09 Lecture#6

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For hemisphere: atlantic, pacific and canadian seas but limited by sea ice condition because they need warm open water surface. Coldest month of the winter is february, therefore lowest occurrence of polar lows here. Pacific minimum is in january due to the sea ice condition, possibly. Can be caused by lightening, point-source, excessive solar radiation within dry areas of forests". Whatever is causing the fire is burning oxygen (combustion), is also the fuel for the storm. Air rises from fire forming the updraft -> chimney effect. For the thunderstorm, updraft and downdraft is called convective cell. Absent: no latent heat here; no change of phases. Only thing that is fuelling storm is heat from fire, causing air to rise, and therefore storm is self-sustaining. The larger the particle size, you need stronger winds for the storm to develop. In arid regions, such as deserts, sand surface heats up intensely. This summer 110/112 degrees celsius, huge dust storm formed over arizona.

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