In the past two days, the strong cold air finally began to penetrate into the south of Huaihe River after sweeping across the north. The continuous heat wave in the south finally showed signs of easing. On the afternoon of August 24, judging from the 24-hour temperature change chart, today's large-scale blue-purple cooling area penetrated deep into the south, which is a sign of the depth of cold air.
But in fact, the fat subtropical high pressure did not completely collapse due to the deepening of cold air. At 8 a.m. on August 24, Beijing time, from a 500-hPa level, today's strong subtropical high pressure continues to control my country's Tibetan Plateau to most areas south of the Great Wall. Cold air actually invades at the bottom, and middle and upper levels are still Shown as subtropical high pressure. The intrusion of cold air is not complete. Today, large-scale heat waves continue to occur in the Sichuan Basin and Jiangnan.
When will this heat wave end? Recently, active cold air means the strengthening of high-latitude cold air and the violent fluctuations of in the westerly belt. In fact, from the Eurasian circulation situation analysis field at 8 a.m. on August 24, a strong warm high pressure appeared suddenly in the Russia- Kazakhstan line, and the central geopotential height even reached 5880. This It is different from the subtropical high pressure. This is a strong blocking high pressure formed by the violent oscillation of the westerly belt. It corresponds to the formation of a strong high pressure area in Russia. A large area of negative pressure has been formed over Lake Baikal in Russia and east Central Siberia and Eastern Siberia. Anomaly geopotential area, which is the development of a series of cold vortex systems.
One result of the formation of this large negative anomaly geopotential area is that a large amount of cold air has accumulated in Siberia , Mongolian Plateau and other places. The cold air currently moving south to central and eastern my country is actually the accumulation of cold air. A small part of the air. Next, under the squeeze of Russia's strong warm high pressure, the accumulated cold air will continue to penetrate into the central and eastern regions of my country. To put it simply, the central and eastern regions will further cool down.
Current supercomputer predictions believe that the subsequent fluctuations in the westerly belt will transport cold air southward. Especially around August 31, a particularly strong wave of cold air will pour southward, reaching most of the Yangtze River basin. Even the hot Sichuan Basin is expected to cool down. Looking at it this way, the recent heat wave in the south is expected to be completely resolved by the end of the month, and places such as Sichuan and Chongqing, which are the core of the scorching heat, are finally showing signs of easing the heat wave.
#Cold air# #Weather# #Sichuan high temperature# #Chongqing high temperature# #High temperature#
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