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How Hurricane Frequency And Intensity Stack Up Against IPCC Predictions

by Dr. Matthew Wielicki
September 05, 2023, 2:26 PM
in News and Opinion
Reading Time: 4 mins read
A A
2

hurricaneHurricane season in the US…

In the United States, hurricane season primarily refers to the Atlantic and Eastern North Pacific regions, as these are the areas most likely to be impacted by tropical cyclones.

Atlantic Hurricane Season (which includes the North Atlantic Ocean, the Gulf of Mexico, and the Caribbean Sea): [emphasis, links added]

  • Starts: June 1
  • Ends: November 30
  • Peak: Typically mid-August to late October.

Eastern North Pacific Hurricane Season (which includes waters off the west coast of Mexico):

  • Starts: May 15
  • Ends: November 30

The distribution of hurricanes across the season can vary from year to year, but generally, the season starts slowly in June and early July, with a gradual increase in activity.

The peak of the season is in mid-September, which historically has the highest likelihood for major hurricane formation. After mid-September, activity tends to decline but can remain significant through October.

By the time November rolls around, hurricane activity typically drops off considerably, though late-season storms are not unheard of.

Factors like sea surface temperatures, atmospheric conditions, and the presence (or absence) of phenomena like El Niño or La Niña can impact the formation and intensity of storms in any given year.

Hurricane landfalls in the US…

The frequency of hurricane landfalls in the USA is a complex topic, depending on numerous factors like climatic conditions, sea surface temperatures, and atmospheric patterns.

Although this natural variability exists, it is clear that there is no trend in the frequency of landfall hurricanes in the USA [amid] increasing atmospheric GHG concentration.

In fact, this is what is expected during a time of warming. A recent study published in the journal Nature titled, “Declining tropical cyclone frequency under global warming”, states:

Assessing the role of anthropogenic warming from temporally inhomogeneous historical data in the presence of large natural variability is difficult and has caused conflicting conclusions on detection and attribution of tropical cyclone (TC) trends. Here, using a reconstructed long-term proxy of annual TC numbers together with high-resolution climate model experiments, we show robust declining trends in the annual number of TCs at global and regional scales during the twentieth century.

What does the IPCC say?

Here’s a broad summary of what the IPCC has indicated regarding the frequency and intensity of hurricanes and tropical cyclones based on previous assessment reports:

Observed Changes:

  • There is evidence to suggest that the intensity of hurricanes, particularly the strongest hurricanes, has increased since the early 1980s in the North Atlantic region. (Interesting that this increase has not been observed in landfall hurricanes on US soil.)
  • While there are regional variations, globally, the proportion of intense hurricanes (Category 4 and 5) has likely increased over recent decades, and the frequency of weaker tropical cyclones has decreased.

Future Projections:

  • It’s more likely than not that we’ll see an increase in the frequency of the most intense tropical cyclones by the end of the 21st century.
  • There’s a projection of more rainfall associated with tropical cyclones, particularly in the North Atlantic and Western North Pacific.
  • Despite an expected increase in intensity, there’s uncertainty regarding the frequency of tropical cyclones. Some models predict a decrease in the overall number of tropical cyclones, but an increase in the proportion of high-intensity storms.

Influence of Climate Change:

  • Warmer sea surface temperatures can provide more energy for hurricanes, potentially contributing to their intensification.

Let’s take a closer look at the claim that there will be “more rainfall associated with tropical cyclones”. A recent study published in the journal Geophysical Research Letters titled, “Has There Been a Recent Shallowing of Tropical Cyclones?”, states:

The global inner-core high thick cloud fraction measured by satellite has decreased from 2002 to 2021 by about 10% per decade. The TC inner-core surface rain rate is also found to have decreased during the same period by a similar percentage.

To summarize, observed landfall hurricane data for the US shows no trend in the frequency of hurricanes striking the coast since 1850, contradictory to claims by the IPCC that such an increase was already occurring.

Furthermore, a recent analysis of precipitation associated with global hurricanes over the last few decades shows significant decreases in rain rate, also contradictory to expectations of the IPCC.

There has been no increase in the frequency or precipitation intensity of hurricanes related to climate change.

Read more at Irrational Fear

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Comments 2

  1. SPURWING PLOVER says:
    2 years ago

    They have been trying to find aa link between Hurricanes, Tornados even Blizzards on Global Warming/Climate Change as always the M.S. Media bottom feeders tried to connect Hurricanes Katrina, Sandy Harvey and Irma as well as the latest ones on Global Warming/Climate Change without any evidence to support their stupid ideas

    Reply
  2. David Lewis says:
    2 years ago

    At the beginning of this century, global warming theory predicted that there would be fewer hurricanes but those that we had would be more intense. The theory stated the hurricanes are caused by the temperature difference between the poles and lower latitudes. Since the pole warm up faster, there is less of a temperature difference. For the hurricanes that do happen, they would be stronger because of more energy in warmer water. Real world data shows no significant change in either frequency or intensity of hurricanes. If the theory is correct, the one degree increase in temperature hasn’t been enough to make the difference.

    To show just how insane the climate activists and their media stooges can be, the hurricane that occurred soon after President Trump took office was blamed on him. There is nothing he could have done in that time to influence these events. In reality, there is nothing anyone could do even after a much longer time. Carbon dioxide is beyond it saturation point as a green house gas. Controlling or failing to control emissions can not make a difference.

    Reply

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