Ciclogenesis e imagenes satelitales
When thinking of cyclones, often the first images that come to mind are those from satellite imagery. However, we typically use numerical models, not satellite imagery, to look for cyclogenesis (the initial development and strengthening of a surface cyclone) and then look at surface variables for indications that it has occurred. Why don't we just look for cyclogenesis on satellite imagery since that is what we tend to think of when it comes to cyclones? To help in this regard, we will explore satellite patterns associated with extratropical cyclogenesis.
Having a basic understanding of extratropical cyclone development is helpful before moving to a satellite perspective. Cyclones tend to form along pre-existing fronts (baroclinic zones), with the approach of an upstream mid- to upper-tropospheric perturbation. The surface baroclinic zone kinks, creating a cyclonic circulation and a cyclone is born.
http://lance-modis.eosdis.nasa.gov/imagery/realti me/2012305/crefl2_143.A2012305092500-2012305093000 .2km.jpg
Below, we will examine primary cyclogenetic features as viewed on satellite imagery.
Cyclogenesis can have different intensity and different depths. Summarizing is easy to understand words; cyclogenesis can form in two ways:
1 - If the advance of a mass of cold, dry air over the continent meets another warm characteristics, their interaction begin to cause a rapid decrease in pressure.
This decrease is due to the warm air mass is forced to ascend and positioned parallel to the cold face. The air ahead of the cold front begins to push and create a cyclonic rotor ends sometime for independence of the low pressure system associated with the advancing cold air.
2 - The second and more likely to occur, is due to a disturbance of mid-level cold air begins to generate promotions as air sinks. This rise is maintained with the addition of warm, moist air north and cold, dry air south.
Cyclogenesis in Uruguay 2012-10-19
In a satellite image is very distinct pattern of cold, dry air due to the formation of clouds fragmented type, while in front of the low observed a thick layer of clouds.
The surface winds associated with the rotating hands of a clock and always tangential one. That is why the greatest intensities are located ahead and behind.
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