2023-06-30 11:09:00
Many states in the United States continue to issue high temperature warnings “hot dome” phenomenon may be the main cause of extreme high temperature
CCTV News Client News Recently, many places in the northern hemisphere have been shrouded in extremely high temperature weather. Many states in the southern and western United States continue to issue high temperature warnings, and the number of deaths from extreme high temperatures is also increasing.
Richard, a local resident: I don’t know what’s going on, but the weather is getting hotter and hotter.
The heat in Texas has been going on for more than two weeks. Recently, a video of a courier almost exhausted due to high temperature and physical strength while delivering goods has attracted the attention of the American media. Some first responders in Texas said that they received more than twice as many heat-related calls in June this year as in August and September last year combined.
Texas First Responder Justin Reed: High temperatures affect everyone. In the month of June alone, our fire brigade responded to more than 40 calls of heat-induced illness.
According to reports, the extreme high temperature across the southern region may continue until early July. Next, a heat wave will sweep across the western United States. Heat warnings have been issued for parts of New Mexico, Arizona, Nevada, California and Oregon, with temperatures expected to soar above 100 degrees Fahrenheit by the end of this week and early next week in many of them. Temperatures in Arizona and parts of California’s deserts will approach 120 degrees Fahrenheit (regarding 48.9 degrees Celsius).
National Weather Service Meteorologist Jacob Zelinger: This is the earliest time we have issued a high temperature warning, and it is the most serious high temperature warning we have issued before July, which is quite abnormal. Usually we only see such high temperatures in July and August.
What is a “thermal dome”?
American meteorological experts believe that the recent extreme high temperature weather in the United States is mainly caused by the “heat dome” phenomenon, and it is expected that the heat wave will continue for some time. So, what is a “hot dome”?
“Hot dome” refers to the stagnation of high-level atmospheric heat and high pressure for a period of time. The atmospheric circulation between the high pressure and the nearby low pressure forms a stable “dome” shape. The high pressure covers the hot air like a hood in the heat wave. area while preventing cold air from entering. The air in the lower layers near the ground is heated by the ground and rises in the “hot dome”, but because of the high pressure in the upper layer, it is pressed back to the ground by the high pressure. In this way, the temperature in the “heat dome” gets higher and higher, which can trigger a heat wave or super heat wave event.
High temperature, little rain, air pollution and other phenomena will occur in the “hot dome”.
ABC Host: All of these things put together create a dome (overhead) that will concentrate the heat where we live. This heat has nowhere to go, and there are no strong winds to blow it away.
The “hot dome” is a natural phenomenon, and humans can hardly intervene to alleviate it, and can only wait for it to slowly disappear. “Hot domes” have occurred with increasing frequency over the past few decades.
Susan Hassall, a climate change expert: “The hot dome” is a high-pressure area. It is the high-pressure system that covers that area, causing the water in the “hot dome” to evaporate and the temperature to continue to rise. There will be no rain and no cloud cover, so it’s going to get worse.
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