For those who may not know (sarc/off), there were no satellites during the 1930’s, and storm counts were spuriously low until the technology improved in later decades. As was already posted, the tropical storm count is biased for the second half of the 20th century because of that. This is also true of tornadoes and storms in general.

Kronocide, try again. Of course like any published material it could be wrong, but sometimes the obvious must be pointed out.

Perhaps you missed this:
agu.org

“The number of North Atlantic tropical storms lasting 2 days or less exhibits a large increase starting from the middle of the 20th century, driving the increase in recorded number of tropical storms over the past century. Here we present a set of quantitative analyses to assess whether this behavior is more likely associated with climate variability/change or with changes in observing systems. By using statistical methods combined with the current understanding of the physical processes, we are unable to find support for the hypothesis that the century-scale record of short-lived tropical cyclones in the Atlantic contains a detectable real climate signal. Therefore, we interpret the long-term secular increase in short-duration North Atlantic tropical storms as likely to be substantially inflated by observing system changes over time. These results strongly suggest that studies examining the frequency of North Atlantic tropical storms over the historical era (between the 19th century and present) should focus on storms of duration greater than about 2 days.”

I’m sure you noticed this agu.org , the one you quoted from and said I “failed to mention” cites the above paper :) Nice try.

Since Warmology is all about everything “global”, based on the available data at policlimate.com, would someone care to point where the data suggests there is an upward trend in tropical storm frequency since 1970, the satellite era?

Image: frequency_12months.png