In May, the Korea Meteorological Administration predicted that this summer will be hotter than the average, and the heat will peak between late July and early August.

However, in the central region, the rainy season, which began on June 24th, continues until August 5th, and the temperature from late July to early August is also cloudy and rainy.

The reason why the Meteorological Administration's forecast for this summer has been completely missed is because it has blocked atmospheric air flow due to the so-called'blocking' of high-latitude warming and stagnation in high-latitude areas.

The Korea Meteorological Administration comprehensively analyzed the weather characteristics at the time, sea level temperature, arctic sea ice, snow cover in Tibet, and the results of climate prediction models in the'Meteorological Forecasts for Summer 2020' on May 23rd. We added forecasts to forecast the weather forecast for June to August.

As an example, there was more snow in the Tibetan area at the time, and the expansion of the high pressure in Tibet was delayed somewhat in late July, so it was expected that the heat would come to Korea.

However, the unexpected blocking caused the Meteorological Administration to overlook this summer outlook.

Due to climate change, the flow of jet streams (the strong winds in the upper layers) weakened in the wake of the phenomenon of abnormal high temperatures in the North Pole, and the cold air in the North Pole moved south to the mid-latitude regions.

Here, the Ural Mountains and two blocking in northeastern China continued to supply high-latitude cold air to the mid-latitudes.

This stagnant front has been going up and down in East Asia, raining more than usual.

A Meteorological Administration official said, "Blocking is difficult to predict in advance."

Although blocking is not a new phenomenon, this year's unusually long period of engagement with the rainy season has also made forecasting difficult.

Generally, blocking lasts for at least ten days at least, but in this case, because the North Pacific high pressure rises in an instant, it is expected to end in late July even if it rains heavily.

An official from the Korea Meteorological Administration said, "I admit that the forecast of Meteorological Agency is wrong, and I feel sick." .

In the central region, the longest rainy season has been the 49th year of 2013, and the last rainy season is August 10th, 1987.

The Korea Meteorological Administration predicted that the rain would continue in Seoul, Gyeonggi-do, and Yeongseo, Gangwon-do by the 14th, from the '10-day forecast' released on the 5th.

In this case, both the rainy season and the end time will break past records.

The southern part of the rainy season at the end of last month may have rain showers until the 10th, but this is a temporary phenomenon caused by atmospheric instability, the Korea Meteorological Administration explained.

If you get out of the rainy season, the temperature will gradually rise and the heat will come.