Posts Tagged ‘hurricanes’

Hurricane Katrina, 2005 – The air pressure, another indicator of hurricane strength, at the center of this Category 5 storm measured 902 millibars, the fourth lowest air pressure on record for an Atlantic storm. The lower the air pressure, the more powerful the storm.
[image credit: Jeff Schmaltz, NASA/GSFC]


This is supported by Hurricanes – Science and Society, which says:
‘It is well accepted that the most influential factor in storm surge generation is the central pressure deficit, which controls the intensity of a hurricane, i.e. wind velocity and stress over the ocean surface and inverse barometric effects.’

The system for categorizing hurricanes accounts only for peak wind speeds, but research published in Nature Communications explains why central pressure deficit is a better indicator of economic damage
from storms in the United States, reports Phys.org.

“Sandy is the classic example. It was a very big storm, but in terms of maximum wind speed it was arguably not a hurricane,” said Dan Chavas, an assistant professor of atmospheric science at Purdue University who led the study. “If you looked at the central pressure deficit, you would have expected it to cause a lot of damage. But if you used maximum wind speed, as people usually do, you wouldn’t expect it to do the damage that it did.”

Central pressure deficit refers to the difference in pressure between the center of the storm and outside it. Pressure and wind speed have been used interchangeably to estimate potential damage from hurricanes for years, but the relationship between them has been a long-standing riddle in tropical meteorology.

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A rational look at recent severe weather events, which have been seized on by disaster-starved climate alarmists to push their pre-conceived agendas.

NOT A LOT OF PEOPLE KNOW THAT

By Paul Homewood

The recent spate of hurricanes has inevitably attracted attention and spawned wildly inaccurate headlines, such as “a 1000 year event”, “the most powerful Atlantic storm on record”, “storm of the century”, and even “most deadly storm in history”.

Many climate scientists have also jumped on the bandwagon, to claim that these storms have been exacerbated by climate change.

With Hurricane Maria now weakening and heading north into cooler waters, it is perhaps time to take a rational look at what has actually been happening.

First, let’s look at the two most notable storms:

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Taking a look beyond the over-simplistic climate hysteria that arises as if by a jolt on the electrodes every time a major weather event occurs, especially if it’s in or near the USA.

Fabius Maximus website

Summary: Millions of words were expended reporting about Hurricanes Harvey and Irma, but too little about the science connecting them to climate change. Here are the details, contrasted with the propaganda barrage of those seeking to exploit these disasters for political gain. Let’s listen to these scientists so we can better prepare for what is coming. Failure to do so risks eventual disaster.

NASA photo of Hurricane Katrina on 28 August 2005 NASA photo of Hurricane Katrina on 28 August 2005.

(1)  A politically useful catastrophe: the Left speaks

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The record-setting twelve-year long hurricane “drought” (no major hurricane landfalls on the US) was just weather. But the Left immediately boldly and confidently declared Harvey and Irma to be caused (or worsened) by anthropogenic climate change. Some of these screeds are mostly rational, just exaggerated or imbalanced. Such as “Harvey Is What Climate Change Looks Like” by Eric Holthaus at Politico — “It’s time to open our…

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Hurricane Katrina [image credit: NASA]

Hurricane Katrina [image credit: NASA]


Although some climate alarmists contend that CO2-induced global warming will increase the number of hurricanes in the future, the search for such effect on Atlantic Ocean tropical cyclone frequency has so far remained elusive, reports CO2 Science.

And with the recent publication of Rojo-Garibaldi et al. (2016), it looks like climate alarmists will have to keep on looking, or accept the likelihood that something other than CO2 is at the helm in moderating Atlantic hurricane frequency.

In their intriguing analysis published in the Journal of Atmospheric and Solar-Terrestrial Physics, the four-member research team of Rojo-Garibaldi et al. developed a new database of historical hurricane occurrences in the Gulf of Mexico and the Caribbean Sea, spanning twenty-six decades over the period 1749 to 2012.
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Makarieva and Gorschov

Makarieva and Gorschov

Our old friend Anastassia Makarieva has a new paper in press with her colleagues Victor Gorschov and A.V. Nefiodov: ‘Empirical evidence for the condensational theory of hurricanes’. A preprint is available here. This theory is an extension of her earlier work on where winds come from, which we discussed a couple of years ago.

The new paper concludes with this:

We derived the relationship between the gravitational power of precipitation and air velocity in the windwall from the previously developed theory of condensation-induced dynamics [3,5]. We emphasize that the gravitational power of precipitation exists irrespective of the dissipation of the kinetic energy of hurricanes (distinct from the interpretation given in work [2]). The hurricane power budget would remain the same even if precipitation occurred in free fall with rain drops not interacting with atmospheric air.

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Not a recent photo [credit: NOAA]

Not a recent photo [credit: NOAA]


We have highlighted this before, but the period just keeps getting longer, much to the relief of many U.S. citizens no doubt.

CNSNews.com reports: It has been 117 months since a major hurricane, defined as a Category 3 or above, has made landfall in the continental United States, according to 2015 data from the Hurricane Research Division of the National Oceanic and Atmospheric Administration (NOAA).

This is the longest span of time in which no major hurricane has struck the mainland U.S. in NOAA hurricane records going back to 1851.

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US hurricane [image credit: NOAA]

US hurricane [image credit: NOAA]


Global warming pundits have failed miserably with regard to US hurricane frequency in recent years. NASA investigates:

The United States hasn’t experienced the landfall of a Category 3 or larger hurricane in nine years – a string of years that’s likely to come along only once every 177 years, according to a new NASA study.

The current nine-year “drought” is the longest period of time that has passed without a major hurricane making landfall in the U.S. since reliable records began in 1850, said Timothy Hall, a research scientist who studies hurricanes at NASA’s Goddard Institute for Space Studies, New York.

Statistical analyses from hurricane track data indicate that for any particular Atlantic Hurricane season, there is about a 40 percent chance that a major hurricane (category 3 or higher) will make landfall in the continental United States. However, during the period from 2006 to 2014, no major hurricanes have made landfall.

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