Tonight to tomorrow morning of the 21st, there is a risk of warning-level heavy snow in the mountainous areas of the Kanto region, and it is dangerous for cars with standard tires to cross mountain passes.
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In the Kanto region, from the evening of today, the 20th (Saturday), developed snow and rain clouds are expected to move in, causing heavy snowfall mainly in inland and mountainous areas. If the temperature is lower than expected and the snowfall becomes heavier, there is a risk of heavy snowfall. Normal tires are dangerous for cars going over mountain passes. Please make sure you are fully equipped with winter equipment and do not overdo it.
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Mountainous area of Kanto-Koshin area, snow becomes heavier from evening
A low pressure system accompanied by a front is expected to develop along the southern coast of Honshu and move eastward until tomorrow, the 21st (Sunday). This is the so-called “south coast cyclone,” which can bring heavy snow to the Kanto region.
It has been snowing since this morning (20th) along the western mountains such as Hakone and the northern mountains such as Gunma, and the snowfall amount in the 6 hours up to 2:00 pm was 6 cm in Kusatsu Town, Gunma Prefecture.
The rainfall was not strong during the day on Saturday, the 20th, but from the evening onwards, as well-developed snow and rain clouds move in, there is a risk of heavy snow falling mainly in the inland and mountainous areas of Kanto-Koshin. If temperatures are lower than expected and snowfall becomes heavier, there is a possibility of heavy snowfall, especially along mountains and in mountainous regions. When driving over a mountain pass, be sure to be fully equipped for winter, check the latest weather and traffic information, and be careful not to overdo it.
“Estimated weather distribution”: Information that can be visually understood by calculating detailed distributions of weather, temperature, and sunshine hours based on observation data from AMeDAS and meteorological satellites. Although it is possible to understand the situation in places where there are no observatories such as AMeDAS, the values of the mesh that includes the observatories do not necessarily match the observed data there.
Heavy snow peaks in mountain areas tonight – tomorrow morning on the 21st, rain in plains areas
The peak of heavy snowfall will be from the night of the 20th (Saturday) to the morning of the 21st (Sunday).
In the mountainous areas of Yamanashi, Nagano, Gunma, and Tochigi prefectures, heavy snowfall is expected at around 4 centimeters per hour, with daily snowfall amounts of 30 to 40 centimeters expected from the beginning to the end of the rain in many places. .
As warm air moves in from early on the 21st (Sunday), snow will turn to rain in low-lying mountain areas. After that, as the weather becomes warmer, it is expected that there will be few places where it will turn to rain and then turn back to snow again.
In the Tama region of Tokyo and the Chichibu region of Saitama Prefecture, snowfall of up to 15 centimeters is expected in many places, so caution is needed to prevent snow accumulation and frozen roads.
On the other hand, rain is likely to dominate the plains of the southern Kanto region, including Tokyo’s 23 wards. At night, when the temperature drops, there will be some places where the rain will mix with snow, but we think the chance of it accumulating is low.
It will rain in the southern Kanto region until the afternoon of the 21st (Sunday), and snow and rain will continue throughout the day on the 21st (Sunday) along the mountains in the northern Kanto region.