Tomorrow, the 31st, Halloween weather: Widespread sunshine, but watch out for showers and thunderstorms in the Kanto and Tokai regions
October 30, 2023 18:44
Tomorrow, the 31st (Tuesday) on Halloween, it will be sunny over a wide area, but please be careful of showers and thunderstorms in the Kanto and Tokai regions, especially in coastal areas.
Halloween on the 31st: Widespread sunshine but warning of rain showers in Kanto and Tokai regions
Tomorrow, the 31st (Tuesday: Halloween), the area around Japan will be covered in high pressure, and it will be autumn clear across the country.
However, in the Tokai region and southern Kanto region (mainly in coastal areas such as Kanagawa and Chiba), rain clouds and thunderclouds are expected to form locally due to the cold air in the sky and the collision of different winds. Even if the weather is sunny, please be careful of showers and thunderstorms. Although the rain falls over a small area, it’s a good idea to bring a folding umbrella after dusk, even in central Tokyo.
[Times when you need to be careful about showers and thunderstorms]
Shizuoka Prefecture: From dawn to night on the 31st
Southern Kanto: From afternoon to night on the 31st
Izu Islands: From noon to night on the 31st
Atmospheric conditions in the Izu Islands are extremely unstable. If you see black clouds, hear rumblings of thunder, or suddenly feel cold wind, these are signs that thunderclouds are approaching. Please be careful of lightning, tornadoes, gusts of wind, and hail, and try to stay safe by taking shelter in a sturdy building.
In addition, there are likely to be some areas of Hokkaido with showers, especially in northern areas such as Wakkanai.
It’s cold on a calm and sunny morning
In the morning of tomorrow, the 31st (Tuesday), the weather will become colder mainly inland due to radiation cooling.
The lowest temperature is expected to be 2℃ in Asahikawa City, Hokkaido, 5℃ in Sapporo City, and 9℃ in Sendai City, which are expected to be at or below normal. Temperatures west of the Kanto region are around 12 degrees Celsius, but inland the temperature will not reach 10 degrees Celsius, and it will likely be so cold that heating will be necessary in the morning.
Temperatures rise during the day with plenty of sunlight, reaching over 20 degrees Celsius in western and eastern Japan, and in Kyushu, there are likely to be some summer days with maximum temperatures of over 25 degrees Celsius. Temperatures in northern Japan are also expected to be higher than normal, with temperatures in Sapporo expected to reach 17 degrees Celsius. During the day, you can comfortably wear a light jacket.
What is radiative cooling?
During this period, when the skies clear from night to morning, the “radiative cooling phenomenon” intensifies, causing the temperature to drop significantly.
“Radiative cooling” is a phenomenon in which something cools down by emitting heat to the outside.
For example, some of you may have had the experience of sleeping on a cold night with your futon tightly covered and staying warm until the morning, but instead sleeping without covering yourself with the futon and feeling cold.
Same as in this case, if the weather is cloudy from night to morning, the clouds will act like a blanket, making it difficult for heat near the ground to escape to the sky, making it less cold. On the other hand, when the wind is weak and the weather is sunny, there are no clouds to act as a blanket, so the heat near the ground escapes into the sky, making it colder.
When the forecast predicts that the radiation cooling phenomenon will intensify, the weather will become colder from night to morning. Please stay warm and have a good time.
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2023-10-30 09:44:32
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