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The siege of active Atlantic hurricane stations will continue for another year, the National Oceanic and Atmospheric Administration predicted on Tuesday. In its annual seasonal forecast, the agency forecast the seventh season of the Atlantic above normal, with 14 to 21 named storms – compared to 14 in an average year – and three to six major hurricanes, classified of category 3 or higher.
Major hurricanes are especially worrisome, as they tend to intensify rapidly or reach wind strengths of 35 mph or more in 24 hours, leaving coastal residents with little time to prepare. These major storms are responsible for the vast majority of damage due to wind and ocean swell, rising water above normally dry land on the coast.
Scientists have observed an increase in hurricanes that have intensified rapidly in recent decades, related to the warming of ocean waters due to human-induced climate change.
NOAA’s outlook for another busy season follows a devastating period of intense storm activity in the Atlantic. The 2021 season produced 21 named storms, the third most recorded, exhausting all names on the National Hurricane Center’s conventional nomenclature list. In 2020, a record 30 named storms were set. The two seasons combined produced the most storms recorded in the United States.
The United States saw more hurricanes of Category 4 and 5 hurricanes between 2017 and 2021 than between 1963 and 2016.
Every year since 2016 it has generated above-average activity in the Atlantic, with five Category 5 storms sweeping the basin during this period. A seemingly relentless parade of major hurricanes – including Harvey, Irma, Michael, Laura, Zeta and Ida – plagued the besieged Gulf Coast over a six-year period.
The effects of Hurricane Ida last year were so severe, from the Gulf Coast to the northeast, that the World Meteorological Organization removed it from the rotating list of hurricane names. The storm caused 96 deaths when it flew from Louisiana to Connecticut and was blamed for $ 75 billion in damage, the fifth most expensive hurricane in the United States.
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Ida, which caused catastrophic flooding in the northeast, including New York City, demonstrated how tropical systems can flood communities hundreds of miles from where they landed. Inland flooding has become the leading cause of death toll from tropical weather systems in recent years. Scientists have also found that man-made climate change is intensifying heavy rains in these tropical systems.
NOAA released its vision at a press conference in New York, commemorating the 10th anniversary of the Hurricane Sandy that hit the region in 2012. Sandy, guilty of $ 80 billion in damage, is listed as the fourth system. most expensive tropical in history.
Sandy was moving from a hurricane to a “posttropical cyclone” when it hit the northeast with a massive storm surge, torrential rain and a large swell of damaging winds.
“As we saw Sandy, it doesn’t even have to be a hurricane to cause so much devastation to communities,” said Christina Farrell, New York City’s first emergency management subcommittee.
The NOAA forecast and a trend toward better accuracy
Spring hurricane forecasts have shown considerable improvement over the past decade after not showing much accuracy from the 1980s to 2013, according to researchers at Colorado State University. Here are the numbers from the NOAA perspective:
- 14 to 21 so-called storms, compared to an annual average of 14.4.
- From six to 10 hurricanes, compared to an annual average of 7.2.
- From three to six major hurricanes, compared to an annual average of 3.2.
The NOAA forecast indicated that there is a 65 percent chance of a season above normal, a 25 percent chance of a near-normal season, and a 10 percent chance that it is below normal. normal.
NOAA’s perspective echoes those of various research institutions and private companies. Colorado State University, for example, predicts 19 named storms, with a 71% chance that the United States will be hit by a major hurricane. Similarly, AccuWeather, the state-based private forecasting company, is calling for 16 to 20 named storms.
Although seasonal hurricane forecasts have improved, storm forecasts once formed have made even greater progress. National Hurricane Center’s runway forecasts have steadily improved, and its average storm intensity forecast error is now 40 percent lower than in 2000.
Rick Spinrad, the NOAA administrator, anticipates additional gains.
“NOAA will triple its operational supercomputing capability this summer,” Spinrad told a news conference on Tuesday. “This upgrade will allow higher-resolution terrestrial models that can handle larger sets of models with more calculations, more advanced physical considerations, and a more advanced ability to assimilate data collected in the storm.”
To improve its predictions, NOAA is also operating five Saildrones (or unmanned vehicles on the ocean surface) to investigate the conditions; expanding the potential for extreme rainfall from three to five days in the future; and the introduction of a product to identify where the peak will occur when a storm approaches the coast.
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Many indicators point to the high probability of a high season. The position of several key atmospheric features is noteworthy, and the ocean seems ready to withstand major storms.
Items being monitored include:
Surface sea temperatures. Hurricanes thrive when water temperatures reach between 80 and 80 degrees. Hurricanes are heat engines that extract thermal energy from the “ocean heat content.” A larger, deeper reservoir of exceptionally soft ocean water translates into more fuel to generate or maintain a hurricane.
- Water temperatures throughout the Gulf of Mexico and the western Atlantic are 1 to 3 degrees above average. Unusually hot water increases the “potential intensity” or the maximum theoretical force that a hurricane can reach.
The loop current. Some researchers say the unusually high temperatures in the loop current of the Gulf of Mexico are a disastrous sign for next season. The loop current is a warm core vortex that winds north of the Florida Strait and the Yucatan Peninsula. The current could give an extra boost to the storms if they cross, but it is a much larger piece of an atmospheric puzzle.
The girl. La Niña is a drop in sea surface temperatures in the eastern tropical Pacific. It launches a chain reaction process that encourages increased activity from Atlantic hurricanes. Specifically, it cools the air above this minimum temperature relative to the eastern Pacific, stimulating the movement of subsidence. This makes it easier for the air over the Atlantic to rise and feed the big storms.
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Wind shear. The wind shear is a change in wind speed or direction with height. Too much shear can disrupt the circulation of an incipient storm and break it before you have a chance to get organized. Shear can also mean the disappearance of a strong hurricane.
- During La Niña summers, there is usually a reduction in wind shear in the tropical Atlantic. This will facilitate the formation of hurricanes and stay stronger for longer.
NOAA’s outlook also pointed to “an improved African monsoon” that bears more disturbances from Africa entering Atlantic waters, where they can turn into storms.
The hurricane season officially begins on June 1
The first storm of 2022, once named, will be called Alex. If all 21 names from the National Hurricane Center list are used, forecasters resort to an additional list of names. The supplementary list was developed after the 30 storms that set the record in 2020 that led forecasters to use Greek letters after 21 storms had earned names.
In recent years, there has been an increase in the storm at the beginning of the season. NOAA has proposed moving the “official” start of the hurricane season to the Atlantic from June 1 to May 15, reflecting the trends observed in a warming world. This would also coincide with the start date of the May 15 hurricane season in the eastern Pacific.
No matter how many storms form, forecasters each year emphasize that it only takes one storm to make a memorable and potentially devastating impact on a community. In early May, the Hurricane Center led a public awareness campaign to urge preparations for next season.
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“Early preparedness and understanding of your risk is key to being hurricane-resistant and climate-ready,” said Gina M. Raimondo, secretary of the Commerce Department, which oversees NOAA.