This is because in the latter part of the time series there is a decrease in
the total number of tropical cyclones, largely owing to a large multidecadal cyclone in the WPAC (which comprises 40 % of the global tropical cyclones), see Fig 3 in Webster et al..
According to the most recent Intergovernmental Panel on Climate Change report, the wind speed and rainfall rates in tropical cyclones are projected to increase during the 21st century, even while
the total number of tropical cyclones remains nearly steady, or even decreases.
Looking at data from 1855 through 2005, Webster and Holland found that
the total number of tropical cyclones per year doubled in that time, from an average of six at the beginning of last century to 14 over the past decade.
Not exact matches
The
total number of typhoons might actually go up a bit because
of the promotion
of some
tropical storms to typhoons, but
of course the distinction between these classes
of cyclone is arbitrary.
--
Tropical cyclones near average overall / Historic Super Typhoon: The number of tropical cyclones during 2013 was slightly above average, with a total of 94 storms, in comparison to the 1981 - 2010 averag
Tropical cyclones near average overall / Historic Super Typhoon: The
number of tropical cyclones during 2013 was slightly above average, with a total of 94 storms, in comparison to the 1981 - 2010 averag
tropical cyclones during 2013 was slightly above average, with a
total of 94 storms, in comparison to the 1981 - 2010 average
of 89.
There is no appreciable long - term variation
of the
total number of tropical storm strength
cyclones observed in the north Indian, south - west Indian and south - west Pacific Oceans east
of 160 ° E. (Neumann, 1993; Lander and Guard, 1998).