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Extra Tropical Cyclones
Transcript of keynote speech by Donald
Burfitt-Dons continued
When we think of hurricanes or cyclones we automatically
think of the tropics. That is where all the action is. The tropics are
of course the region bounded by the sun’s limits as the earth
orbits it over the year i.e. 23 degrees 27 minutes north and south of
the equator, or the tropics of Cancer and Capricorn.
However, cyclones outside that band of latitude do
occur and in quite large numbers, extra tropical cyclones, or ETCs for
short. They are common and are becoming more intense.
So when are they most likely? A study by the American
Met Society concluded that they are generally occur in December and
January, but in Europe more like January through to March And they’re
a lot of them about. In the Northern Hemisphere alone about 230 form
each year.
Basically there are two types categorized by the method
of formation. The first occurs through simple migration from it’s
origin in the tropical regions to higher latitudes known logically as
extra tropical transition cyclones. Generally they are found in the
30 to 40 degree band of latitudes. Donald
Burfitt-Dons talks about cyclogenesis
the
planet's way of recycling heat energy/
the first Brazilian hurricane/cyclones
outside the tropics/cyclogenesis/how
the GWA monitors hurricane activity/the
rising tropopause/ETC activity
since the 50s/l ETC activity
since 1990/ the effect of an ETC
on London /how superwinds form/
the impact of ETCs on aircraft/data
from 21 recent storms/ UK as a breeding
ground for tornadoes/
the impact on the insurance industry/
future implications /threat
of ETCs to Europe and UK
