MARCH 16, 2021
By Paul Homewood
Wow!! A BBC man actually tells the truth about hurricanes!
The Atlantic hurricane season officially begins on 1 June. But over the past six years, significant storms have been forming earlier than this. So does the hurricane season need to start earlier – and is climate change to blame?
At a regional meeting of the World Meteorological Organization (WMO) this week, meteorologists and officials will be discussing a possible change to how the hurricane season is defined.
“The 2020 hurricane season was one of the most challenging in the 40-year history of [the] WMO’s Tropical Cyclone Programme,” says WMO Secretary-General Prof Petteri Taalas.
“The record number of hurricanes combined with Covid-19 to create, literally, the perfect storm.”
The hurricane season has officially started on the 1 June since the mid-1960s, when hurricane reconnaissance planes would start routine trips into the Atlantic to spot storm development.
Over the past 10 to 15 years, though, named storms have formed prior to the official start about 50% of the time.
And the way they are defined and observed has changed significantly over time.
“Many of these storms are short-lived systems that are now being identified because of better monitoring and policy changes that now name sub-tropical storms,” Dennis Feltgen, meteorologist at the US National Hurricane Center (NHC) told BBC Weather.
The 2020 Atlantic hurricane season was the most active on record with a total of 30 named storms. Two of those storms – Arthur and Bertha – formed in May.
As all the pre-determined names were used up, officials at the NHC had to move on to using the Greek alphabet for only the second time.
During the 2020 season, the NHC had to issue thirty-six “special” forecasts called Tropical Weather Outlooks prior to 1 June. These highlight areas in the Atlantic where meteorologists monitor activity.
Mr Feltgen said that “in order to provide more consistent information for late May and early June systems, NHC will begin to issue these outlooks routinely from 15 May this year”.
Is this a step closer to officially recognising the season starting earlier?
“Discussions will need to be made on the need for, and potential ramifications of moving the beginning of the hurricane season to 15th May.”
When referring to the average or normal Atlantic hurricane season, meteorologists have used a 30-year climate average from 1981-2010.
But we now have a new climate period of 1991-2020 to consider and this dramatically increases what we should now consider “normal”.
Data will be discussed and finalised by the National Oceanographic and Atmospheric Administration (Noaa) in May, ahead of the new season.
But data provided by Brian McNoldy, senior researcher at the University of Miami’s Rosenstiel School, shows a 12-19% increase in named storms, hurricanes and major hurricanes.
Is climate change playing a role?
The number of named storms has increased over the decades, but there is no real evidence this is the result of a warming world.
Dr McNoldy notes “the big shift in counts is simply that there were several inactive seasons from 1981-1990 and several active seasons from 2011-2020”.
“Once that inactive period drops out of the average, and is replaced by the active, it will increase the numbers”
The overall increase from 1961 is also likely to be due to better technology, along with observations over the Atlantic Ocean.
Since satellites came along in the 1980s, we can spot and monitor the development of tropical cyclones and name them when they meet the threshold.
We are simply able to record more.
However, it is thought climate change is having an impact on the intensity of tropical storms and hurricanes and therefore their potential impacts.
Experts have noted that, in recent years, tropical storms that make land are persisting far longer and doing more damage than in the past.
In short then:
1) We now record many more hurricanes than we used to in the past because of better technology and satellites which really only came along in the 19801s.
2) We also name more storms because of policy changes that now include sub-tropical storms.
3) The 1980s was a very inactive decade for hurricanes, thus skewing trends. But since the 1960s, the rise in numbers can be explained by better observation.
There is the usual nonsense about hurricanes getting stronger, for which there is absolutely no evidence. As we can see below, major hurricanes were just as frequent as now back in the 1950s. The inactive period of the 1970s and 80s is also evident, and as we know this is associated with the cold phase of the AMO:
If the theory was correct, we would expect to see an increasing frequency of major hurricanes worldwide. But we don’t:
Finally, let’s see what NOAA had to say about Atlantic hurricanes in their latest assessment last September:
It could not be clearer.
Maybe Simon King who wrote this piece should have a word with Harrabin, McGrath and co, who keep misleading the public about “record hurricane seasons”.
via Watts Up With That?
March 16, 2021 at 12:25PM