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Combination of factors causes extreme weather: experts

A combination of bad factors, plus cold air mass and convergence of winds at a height of 5,000 meters, have caused extreme weather phenomena, including large hail and the 50-year historic cold spell on April 22-23.

Many dangerous weather phenomena took place in the first months of the year. Hail occurred in late January. Sun and sultry heat appeared in late March and early April but it was followed by a historic cold spell.

 

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Nguyen Van Huong from the National Center for Hydrometeorological Forecasting said that climate change has made extreme weather phenomena occur more regularly everywhere. These are also the results of many bad weather factors, cold air masses and convergence of winds.

Huong predicted that from now to the end of May, Vietnam will have 2-3 more spells of cold air. However, the intensity of the cold air spells won’t be as strong as the one seen on April 22-23.

However, he warned that the cold spells during the intermittent period, when moving into Vietnam, will meet hot and humid air masses and cause extreme weather events such as storms, whirlwinds, hail and strong winds.

Huong cited a report of the World Meteorological Organization (WMO) as saying that the last five years had the highest global average temperature in the past 140 years, with the average standard deviation of temperature as follows: higher by 0.87oC in 2015, 1.04oC in 2016, 0.93oC in 2017, 0.78oC in 2018 and 0.99oC in 2019.

2016 was the hottest year and 2019 was the second hottest year. The most recent five years saw the temperature reaching the highest levels among the data monitored since 1880.

In the context of global warming, Huong said 2020 is expected to have higher temperatures than many years ago. The average temperature in Vietnam so far this year has been higher by 1.0-2.5oC of many years ago.

In the context of global warming, Huong said 2020 is expected to have higher temperatures than many years ago. The average temperature in Vietnam so far this year has been higher by 1.0-2.5oC of many years ago.


It is expected that the average temperature in May-October will be higher by 0.5-1oC than that of the same periods last year. Heat waves are likely to happen in May and June in the north, and in May-August in the northern and central parts of the central region.

“We believe that heat waves this year will be intensive, but they will be less intensive than 2019,” he said.

The National Center for Hydrometeorological Forecasting believes that the 2020 typhoon season in the East Sea may come later than in previous years. The number of typhoons and tropical depressions in the East Sea which have a direct impact on Vietnam’s mainland are likely to approximate the previous years’ average level.

Le Ha 

 

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