Hurricanes in the United States at the maximum “usual”

More than 30 US states have witnessed nearly 900 hurricanes, since the beginning of this year, killing dozens, destroying buildings and nature damaged in large parts of the eastern United States, and heavy losses in billions.

It coincides with the fact that this strange and volatile mix of the weather components needed to form hurricanes has repeatedly repeated, since mid -March, and the season has not yet ended.

“In order for a hurricane that there must be a thunderstorm capable of generating a hurricane, and these thunderstorms are often called” giant cells “, which feature a pattern called (the Mediterranean),” said Jana Hauser.

She explained that the formation of “giant cells” requires a set of conditions that make the atmosphere unstable, as these conditions begin with warm and humid air on the surface and cold and dry air over it, and instability arises from increasing warm air flooding, which makes it rise to the top.

She added, “This mixture needs another specific factor, which is the wind, as the wind changes its speed and direction with the height of the atmosphere.”

“This can create something similar to a tube of rotating air horizontally, and after that the emerging hurricane needs an upward antenna, or air that moves to the top, which narrows the rotating air and rushes it, so it turns it as a bicycle frame to the form of tops in the form of peaks.”

She emphasized that all of these conditions are necessary, but they are not always sufficient, nor did you understand the accurate mechanisms of the formation of the hurricane completely, but in the first place the rotation of the air on the ground must meet with a strong rising antenna at the top, and this attracts rotation inward, as the artistic skate is tightening his arms.

Suitable conditions

Hurricanes occur when appropriate conditions are available, from Argentina to Italy to Bangladesh. But the United States is undisputedly the average annual number of these storms.

North America’s geography is naturally strengthening a decisive collision with the air blocks (air currents heading north of the Gulf of Mexico, while the cold and dry winds are pushed east over the Rocky Mountains).

The air blocs meet above the center of the country, hence the naming of the region, which is centered around the northeastern Texas and Aklouma in the name of the “Hurricane Corridor”.

“If you will design a place that would be exposed to frequent severe storms, you will build something like the center of the United States,” said Rich Thompson.

He added: «Over the past decade, or so, this hurricane center has changed a little, and a new corridor of hurricanes has appeared about 400 or 500 miles east, and this is partly due to the arrival of the air of the wet Mexico Bay more east than before.

Heat

According to hurricane specialized at Ohio State University, Jana Hauser: “Spring tends to be peak because it is a transitional separation. After the end of the winter, there is still cold and virus air at the northern latitudes and at the top, and at the same time, the sun rises for a longer period, which leads to the heating of surface air and the promotion of instability.”

She said: “Autumn is also a transitional chapter, but the air at the top remains warm in general for some time after the summer, and the activity of hurricanes is not inclined to recover again except later in the fall, when the atmosphere cools again.”

Hezer noted that the peak of local hurricanes tends to move north by the end of spring and enter the summer, where many of them occur in the Gulf Coast early in the spring, while in the southern plains it is in May and June, while the northern plains and the upper West are hit in June and July.

By mid -May, the number of hurricanes in the United States was about 886 hurricanes, and in that Rich Thompson said: “We are now at the maximum of what is usual, and until this month, the most active period this year was in mid -March and early April,” noting that “these two periods are already pushed to what is customary.”

Stimulating

It is noteworthy that meteorologists at the US National Meteorological Authority are making efforts to keep pace with the burden of additional work during the wave of severe storms in the center of the United States, some of whom work on the two -term system to issue warnings and monitor the damage caused by deadly hurricanes.

Five former managers of the authority said in a letter they wrote earlier in May, that they are afraid of the possibility of life losses due to the lack of employees.

The Jackson office in Kentucky is among the offices that suffer from a shortage of meteorological experts, and the additional work was finally included in one of the proposals that the Meteorological Authority offered to its employees to help bridge the deficiency.

In an e -mail, the authority stated that the meteorological agency offices in Kentucky provided “air predictions and warnings in time and support for decisions in the days and hours that preceded the harsh weather on May 16”, including through official publications, social media and weather radio of the National Administration. About NPR

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Periodic systems

The bends of the “jet current”, which is a narrow range of strong winds in the atmosphere, is a part of the activity of the hurricane season.

“The (jet current) really determines the types of weather we face on the surface, as it affects the paths of storms, and it forms the borders between warm and cold air blocks.”

In the case of this spring, Hauser explained: “We only have high -energy periodic systems that move hurricanes, and their great effectiveness in causing harsh weather has proven when they happen.”

For his part, Rich Thompson, the director of operations at the Predictive Storms Center of the National Meteorological Authority, Rich Thompson, considered that “it is only related to the availability of auxiliary factors and the exploitation of storms for them.”

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Follow storms

Kentucky’s last hurricane caused severe damage. Reuters

The assistant director of the Regional Climate Center for the Middle West at Berdo University, Melissa and his hand, said that warning people of large hurricanes requires a great effort, because it requires a large number of meteorological experts with high skills who are able to use radar data to track storms while they are moving across the states and entire regions.

She added: “The publication of warnings of one hurricane is already complicated, and the publication of multiple hurricane warnings at the same time over a large area, represents a greater challenge because it requires coordination between meteorology experts in multiple locations and data from multiple radar devices.”

Wahdiyyat noted that the increase in the spread of large hurricanes has become particularly noticeable as the administration of the US President, Donald Trump, to reduce the budget of the National Meteorological Authority significantly, as the meteorological agency offices suffer many jobs that were not occupied due to the freezing of federal employment.

During the last deadly hurricane in the state of Kentucky, which caused severe damage, the local meteorological office in Jackson in the state was forced to borrow air predictions from other offices in the region, given the lack of employees.

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Stable

The American Middle West has witnessed, so far, a number of hurricanes beyond the average. By this time of May, more than 600 hurricanes are usually reported in the United States.

As for this year, the number of hurricanes has exceeded this.

But this does not indicate a long -term trend, as the assistant director of the Regional Climate Center for the West at Berdo University, Melissa and his hand, says: “There is no increase or decrease in the total number of hurricanes that we see.”

“This number was largely stable, and its history dates back to almost the 1950s.”

However, hurricane patterns in the United States change in other ways. The waves of large hurricanes, such as those that struck the states of Kentucky and Missouri during the last weekend, where many storms swept a large area in a short period of time, more common.

And Wadiyat explains: “In the past, we have not seen days witnessing large waves of storms as we are witnessing now, and it was unusual to see dozens of them in one day, but now we witness this year after year.”

. 30 American states have witnessed about 900 hurricanes since the beginning of this year.