Why Vertical Instability has been low during 2011 North Atlantic Season
As we have seen during the 2011 Atlantic hurricane season,it has been not a normal season in terms of systems developing and mantaining for a longer time like some of those brief tropical storms that formed.But the question is what caused the dry air in the mid levels to be prevalent?
Vertical instability is obviously an atmospheric phenomenon. So wouldn't one expect that it would change very rapidly because the weather changes rapidly? Its not like sea surface temperature anomalies, which one would expect to remain fairly unchanged over the span of weeks or months (the high amount of energy it takes to heat or cool water). But the graph clearly shows that the vertical instability over both the Caribbean and Tropical Atlantic has been below average for the whole year. Could it be due to positions and intensities of pressure systems such as Bermuda high?
Let's have a good discussion about this.
Updated: 11:24 PM GMT on October 22, 2011
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