2023-04-30 05:38:36
The start of May will be broadly sunny, but don’t let your guard down. The weather will change suddenly in the afternoon. Watch out for sudden thunderstorms, gusts, and hail.
April 30, 2023 14:38
Tomorrow, May 1st (Monday), it will be sunny in the morning, but don’t let your guard down. In the afternoon, the atmospheric conditions will become unstable, and there is a risk of sudden changes in weather mainly on the Sea of Japan side. In the Kanto region, be careful of sudden rain, lightning strikes, gusts and hail in the afternoon. If you see black clouds, hear thunder, or feel a sudden cold breeze, it’s a sign that a thundercloud is approaching. Evacuate early.
Beware of sudden weather changes even when the weather is clear
At the start of May tomorrow (1st), it will be sunny over a wide area in the morning. At first glance, it may seem like a perfect day for excursions, but you should be careful. While the temperature on the ground rises, the atmosphere is expected to become very unstable because a strong cold air for this time of year will enter the sky.
Umbrella marks are attached only to Hokkaido and Hokuriku, but in the wide area from Hokkaido to Kinki, there is a risk of sudden weather changes in the afternoon.
The probability of lightning strikes (probability of lightning occurring) is expected widely on the Sea of Japan side, and in particular, orange areas showing 70% or more can be seen mainly in Tohoku and Hokuriku. In addition, the Kanto region is also high at around 50%, mainly inland.
Hokkaido to Kinki Be careful of sudden changes in the weather in the afternoon
The weather point for the start of May is “even if it’s sunny in the morning, pay attention to sudden changes in the weather in the afternoon.”
In the morning, it will be sunny over a wide area from Hokkaido to Kyushu, but from around noon, thunderclouds will develop here and there in Tohoku and Hokuriku. Kanto is also likely to experience rain and thunderstorms in some places after the evening. Be careful of sudden rain, lightning strikes, gusts such as tornadoes, and hail.
Also, “It’s early summer at the foot of the mountain, but it’s still winter in the mountains.” 2,000-meter-class mountains in the southern Tohoku, Hokuriku, and Kanto-Koshin regions may experience snow in the evening. If you plan to enjoy mountain leisure, you need to be prepared for a sudden drop in temperature after a sudden thunderstorm, as well as the cold and snow. Please check the latest information frequently and act cautiously, including changing plans.
thunder is not sweet
During this period, while the surface temperature rises, temporary cold air enters the sky, making the atmosphere extremely unstable and thunderclouds likely to develop. In the past, there have been frequent thunderbolts, tornadoes, and gusts during Golden Week.
On May 1, 2021, thunderclouds will develop here and there from Kyushu to Tohoku due to the effects of a cold low pressure system. A gust of wind occurred from Kikugawa City in Shizuoka Prefecture to Makinohara City, causing damage such as damage to the roofs of houses.
Also, on May 6, 2012, the last day of Golden Week, a tornado occurred from Tochigi Prefecture to Ibaraki Prefecture. In Joso City, Ibaraki Prefecture, it was classified as an F3 scale in a later survey, making it one of the strongest tornadoes in Japan. In Mito, damage was caused in various places, such as observing a leopard with a diameter of 28 mm.
Lightning is called eclair in French. It seems that it is because chocolate is sprinkled on the skin of the shoe like lightning. Eclairs are sweet, but real thunder isn’t sweet, so be careful.
A sign that a thundercloud is approaching
When you see black clouds, hear rumbling thunder, or feel a sudden cold wind, these are signs that thunderclouds are approaching. Evacuate to a sturdy building as soon as possible.
In addition, it is said to be “mountain thunderstorm river rise”, and caution is required because when there is a thunderstorm in the mountains, the downstream river can suddenly rise even if it is sunny.
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