Polar Lows Formation and Duration
Where do they form?
-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
How can you compare polar lows and hurricanes? *** similarities and differences
-Dry, arid regions of the world
-can be caused by lightening, point-source, excessive solar radiation within dry areas of
-are self-sustaining; like thunderstorms; convective cell. Can form pyrocumulus cloud.
How do they form?
-whatever is causing the fire is burning oxygen (combustion), is also the fuel for the
-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.
Okanagan fire in BC
-also form in arid regions
-caused from dust or sand
-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 du