On weekends, the south wind blows a lot and it becomes cloudy and rainy.

5th (Thursday) Very sunny 6th (Friday) -7 ° (Saturday) South wind blows cloudy or rain Developing rain clouds

On the 5th (Thursday), the area around Honshu will be covered with mobile high pressure and there will be many sunny places.
On the 6th (Friday), the high pressure will move to eastern Japan and the humid air will gradually flow into the Japanese archipelago from the south. The wind blows a lot from the south and the weather is going downhill. There will be places like Kyushu and Hokkaido where it will start to rain.
The front line is expected to extend south to Honshu on Saturday the 7th. Warm and humid air will flow to the front and the front will become more active. From the Pacific side of Kyushu, the south wind, centered in the Kanto region, can intensify and cause rain clouds to develop. Check the latest weather information.
On the other hand, a cold front will pass near northern Japan. In Hokkaido and Tohoku, rain is expected as the front passes, and the wind will shift from the south to the cold west.

After the rain, the inflow of cold air Is the development of cold air and snow clouds in the sky over Hokkaido?

After the cold front passes near northern Japan, the area around Japan will have a winter-like pressure distribution with high west and low east, and cold air will gradually enter. On the 8th (Sunday), the north wind will be strongest across the country, and rain clouds will be applied due to the cold air that is produced in the Sea of ​​Japan from Hokkaido to Hokuriku. It is likely to snow mainly at high altitudes.
The cold air intake peak this time is from 9 (Monday) to 10 (Tuesday). According to the current forecast, cold air below -6 ° C, which is a guideline for snow on flat ground, will flow toward the northern part of Tohoku about 1,500 meters above the sky. Around 1500 meters above Hokkaido, the temperature is below -9 degrees Celsius, which is stronger than the cold air that caused the first snowfall in Sapporo and other areas on Wednesday the 4th, and is on par with the cold air. from early December to mid-December. Furthermore, cold air of minus 36 ° C or less is expected to flow temporarily in the vicinity of 5,500 meters over Hokkaido. It is as cold as in the middle of winter.

Not only is strong cold air flowing into the sky, but the sea surface temperature in the northern part of the Sea of ​​Japan is higher than normal, so the temperature difference with the sky becomes very large. Rain and snow clouds are likely to form. On the Hokkaido side of the Sea of ​​Japan, there is a possibility of snow clouds forming even on flat terrain. It seems good to be prepared for large-scale snow. Even in the northern part of Tohoku, there may be places where it turns to snow or spills onto flat terrain and becomes the first snow. Change your car’s tires on snowy roads before it snows.

In the future, after a broad south wind blows, it will change to north wind, so the temperature will change significantly. Be careful not to get sick.