Letters to the Editor—April 29, 2010

Home grown scientist comments on climate

With regards to changes in the frequency and intensity of tropical storms over time, the status of current research is, as you note, inconclusive. The problem of extracting definitive conclusions from the data is complicated by many factors, including the evolution (and variety) of measurement techniques, gaps in the historical storm record, diverse methods of quantifying storm intensity, and the complex and localized nature of tropical storms themselves.

The most accurate and consistent long-term data sample comes from studies of the North Atlantic, so let’s avoid some of these complications by restricting our focus here.

For example, the Pew Center on Global Climate Change claims that the average number of named tropical storms in the North Atlantic since 1996 has exceeded the previous historical maximum set in the 1950s by approximately 40%. You may argue that this is merely the result of spotty historical data being compared to complete modern data; you may reference other studies or measures of storm frequency that show no statistically significant trend; you may claim that the change is a normal multi-decadal variation; and you would be right to so! Nevertheless, it is just one of many studies that at least suggest a long-term trend of increased storm frequency. Clearly, further study is required.

But tropical storm frequency, as it turns out, is less meaningful than intensity, and here the research becomes rather abstruse. You cite Ryan Maue, a Florida State University PhD candidate, whose studies of net global “Accumulated Cyclone Energy” (the integrated sum of all cyclones’ maximum wind speed squared) are very interesting. ACE is a convolution of global storm frequency, intensity, and duration, so it falls a bit outside the stated bounds of discussion. Still, as a comparison, let’s also consider MIT Professor of Meteorology Kerry Emanuel’s “Power Dissipation Index” (the integrated sum of cyclones’ maximum sustained wind speed cubed). Although similar in definition to Maue’s ACE, Emanuel’s PDI indicates a ~60% increase over the past thirty years in the North Atlantic. It is highly correlated with the surface sea temperature, which itself is correlated with global warming.

There’s obviously a good deal of natural variability in the frequency and intensity of tropical storms, and, as discussed, making conclusions about overall trends is difficult at best. This brings me to the main point of your article, and I quote: “Has the weather gotten more severe? Are there stronger storms than in the past due to global warming? My answer to that, at least in regards to tropical storms and tornadoes, is definitely a resounding ‘NO!’” Given the diversity of research opinions and rapidly developing understanding of this topic, I would argue that your definite and resounding “NO!” is unfounded and premature.

Burt DeWilde

Former Rockford resident

Other Stories from the Squire

Top News…


Event during National Law Enforcement Recognition Week   Rockford North Rockford Middle … [Continue Reading...]

pic from Cindy

  This year’s Relay for Life in Rockford, with the theme of superheroes, had plenty of … [Continue Reading...]

Photo 8

ROCKFORD, Mich., May 5, 2015 – The Rockford Education Foundation (REF) has chosen a program that … [Continue Reading...]


John Bitely of Sable Development talks to the board about his intentions to remove sand from acreage … [Continue Reading...]

More Posts from this Category

In Other News

Knowing Your Competition   by David Broyles SCORE Counselor   Regardless of … [Continue Reading...]

Downtown Rockford was as busy this sidewalk sale week as in past years, despite a heat index of over … [Continue Reading...]

Rockford resident, writer and photographer John Hogan shared this picture with the Squire. The … [Continue Reading...]

David S. Fry

They wrote the book on cottage law—literally Recently, Attorney David S. Fry opened the … [Continue Reading...]

More Posts from this Category

Speak Your Mind