2023-08-18 07:31:31
[Summer weather]High possibility of thunderstorms in the followingnoon Use a hut as much as possible for accommodation (Weather forecaster Yuichiro Miyata August 18, 2023)-Japan Weather Association tenki.jp
[Summer mountain weather]High possibility of thunderstorms in the followingnoon.
August 18, 2023 at 16:31
A Pacific anticyclone will cover the area this weekend, but thunderclouds are expected here and there in the followingnoon due to the damp air. To avoid thunder, start early and arrive early, and if possible, use a business hut or an evacuation hut.
[Explanation of the weather chart]Although it is covered by a high pressure system, the wind direction is not stable.
This weekend is a little difficult to judge the weather even if you look at the weather map. On the 19th (Saturday), a high pressure system will cover the area, but the high pressure system south of Honshu and the high pressure system east of Hokkaido are slightly different in nature, and a front has been analyzed between them. Along the front, a group of rain clouds that are likely to become low pressure will advance from the Sea of Japan, so there will be many places in the southwestern part of Hokkaido and the northeastern part of Hokkaido where the weather will be broken. On the other hand, the atmospheric conditions are expected to become unstable in many areas other than northern Japan. This is because winds blowing from high pressure and winds blowing toward low pressure join together near Honshu. When the wind converges near Honshu, a sudden thunderstorm is generally more likely to occur in the mountains in the followingnoon. Be careful of sudden weather changes even if you are covered by high pressure.
The area around Honshu will continue to be covered by high pressure on the 20th (Sunday), but the high pressure in the Pacific Ocean and the high pressure in the Sea of Japan will easily blow in, and the area around Honshu will converge. In the followingnoon, thunderclouds are likely to occur mainly along the inland mountains. A thunderstorm that occurs because there is no deep trough or cold air above, and the lower atmosphere is very moist. Therefore, although it is somewhat unlikely that it will be violently stormy, please be careful as there is a possibility of localized heavy rain.
[Summer Mountain Weather]Widespread severe thunderstorms likely in the followingnoon
Let’s take a closer look at summer mountain weather.
At first glance, only umbrella marks are lined up on Saturdays and Sundays, but it is likely to rain on Saturdays and Sundays from the morning on Mt. Akita-Komagatake, and the mark expresses the possibility of followingnoon thunderstorms from Mt. In the morning, there will be more sunny places, especially in the Japanese Alps. However, even if there are almost no clouds in the morning, be careful of sudden rain in the followingnoon. Avoid sheltering under trees as thunder is likely. Winds are not expected to be strong enough to make movement difficult, but westerly winds may be slightly strong on the mountain ridges in northern Japan near the front.
Concerns regarding impact on autumn foliage due to drought in mountains on the Sea of Japan side
At the earliest, the autumn leaves on the mountains will start in regarding a month, but I’m a little worried regarding the colors of the autumn leaves this season. In northern Japan and eastern Japan on the Sea of Japan side, there has been almost no rain since the end of the rainy season, and the amount of rainfall in the previous 30 days is 20% or less of the normal amount. Typhoons No. 6 and No. 7 also did not bring significant rainfall to this area. Two slow-moving typhoons have also sustained the Foehn phenomenon blowing down mountains, and extreme temperatures have also hit the same region. If you ask the areas that are in the drought, there are areas where rainfall is secured unexpectedly due to showers, but it seems that there are areas where the leaves are already withered in some mountains in Niigata Prefecture.
In order for the colors of the autumn leaves to be vivid, there are the following conditions: (1) there should be sufficient sunlight hours from late summer to autumn, (2) there should be an appropriate amount of rainfall and the leaves should not wither, and (3) it should be cold all at once. The season of autumn rains is regarding to begin, but if the trend of low rainfall and high temperatures continues, it may affect the autumn leaves (especially those that turn red).
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