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3-month forecast After the beginning of spring, the chills go south or the season progresses
In February, there is a chance that cold air will temporarily move south in northern Japan, mainly in the first half. In March, you will be less susceptible to chills. April is expected to be covered in warm air, especially in northern Japan.
Westerly winds from February to April are more likely to flow north than normal near Honshu
According to a three-month forecast released by the Japan Meteorological Agency on February 25 to April, westerly winds are expected to flow further north than normal on the Chinese mainland and meander slightly south into western Japan. . For this reason, the cantilevers from Siberian High to the southeast are quite strong, and there will be times when they will be temporarily affected by cold on Okinawa and Amami. On the other hand, westerly winds are expected to flow northward than normal in the vicinity of Honshu and are less susceptible to cold air.
There is a possibility that the cold air moves south mainly in the first half of February.
This year’s Setsubun has spring on February 2 and 3, which is spring on the calendar.
In February, there is a chance that cold air will temporarily move south in northern Japan, especially in the first half.
From Hokkaido to the side of the Sea of Japan in Kyushu, there are expected to be many cloudy, snowy and rainy days as in normal years. On the Pacific side, there will be many sunny days as in normal years. However, it is easily affected by low pressure and humid air, and there will be times when it will rain. Okinawa / Amami is expected to have many cloudy and rainy days as in normal years.
In Hokkaido and Tohoku, the temperature can be lower than normal in the first half of February, especially in Hokkaido. Throughout the period, it is almost normal, and in the second half of the period, it seems that spring will come suddenly. From Kanto to Kyushu, it will be as high as usual. Okinawa / Amami is expected to be near normal.
March Northern Japan becomes less susceptible to cold air
In March, northern Japan will be less susceptible to cold.
The Sea of Japan side of Hokkaido and Tohoku is expected to have many cloudy, snowy, or rainy days as in normal years. That being said, the number of sunny days in a typical year (the number of sunny days is a day with an insolation rate of 40% or more) is 7.9 days in February and 13.2 days in March on the side from the Sea of Japan from Hokkaido and Tohoku, then 3 In the month of the month, the number of days when the sun arrives increases as in normal years. On the Pacific side, there will be many sunny days as in normal years.
From Kanto to Kyushu, it is expected to be sunny and rainy every few days, like spring. Okinawa / Amami is less susceptible to humid air and will have fewer cloudy and rainy days than normal.
The temperature is expected to be as high as normal in Hokkaido and Tohoku. From Kanto to Kyushu, Okinawa and Amami will be on par for normal years. In Okinawa, there are few sunny days, but it is expected that there will be more days when you can feel the spring sun than in normal years.
April Covered with warm air mainly in northern Japan
April will be easily covered in warm air, especially in northern Japan.
As in normal years, Hokkaido, Kyushu, Okinawa and Amami are like spring and the weather changes in a short cycle. On the Pacific side of Hokkaido and Tohoku, Kanto and Tokai, and from Kinki to Kyushu, there will be many sunny days as in normal years.
The temperature is expected to be as high as normal in Hokkaido and Tohoku. From Kanto to Kyushu, Okinawa and Amami will be on par for normal years.
Snow on the Pacific side due to low pressure from the south shore
From the end of winter to the beginning of spring, heavy snowfall can occur on the Pacific side, such as the Kanto region, due to the so-called southern coastal cyclone moving east towards south of Honshu. Last year, 2020, on March 14, a cyclone with a front traveled south of Honshu. That day, cherry blossoms bloomed earliest in the history of observation in central Tokyo, but instead of feeling the arrival of spring, the rain turned to snow.
Beware of spring disasters
As the seasons change to spring, strong winds become easier to blow. This is because high pressure and low pressure will alternately pass through Japan. As a low-pressure system develops in the Sea of Japan and moves east, the weather can become difficult across the country. It is a good idea to have things around the house that are easily ruined.
In areas with a lot of snow, it is necessary to pay attention to the “avalanche of all layers” in which the entire layer of snow slides on the surface of the ground that has become slippery due to the water melted by the increase in temperature and the rainfall. Stay away from dangerous areas like steep slopes. Due to the melting of snow, the river flows fast and the water level can be high, so playing in the river can be dangerous.
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