How a rainy season front develops and how it works

Explaining how the rainy season front occurs, how it works and more

How the rainy season front We would like to introduce the mechanism and nature of how it works and whether it does.


What is a rainy season front

The rainy season front How it occurs

A rainy season front is a kind of stagnation front So a rainy season front is formed when warm air and cold air collide. A rainy season front is a kind of stagnation front, so when warm air and cold air collide, a rainy season front is formed. It is a stagnant front that is active over Japan from early May to early August, and although its speed is slow, it takes time to move northward. Although its speed is slow, it takes time to move northward. It disappears in the southern part of Hokkaido. It is relatively mild and the rainy season is long. Another feature of the rainy season front is that it is more active before it disappears than when it first appears. We have a tendency to do this.


On the nature of the rainy season front

The air masses that create the rainy season front The momentum is competitive and very unstable. Basically, the rain is not strong. However, as typhoons and canyons move in, the movement of the front becomes more active, and strong rain clouds, including thunderclouds, are formed. If the balance between the two antagonists is stable, it may result in the formation of an ice storm or heavy rainfall. Rainy season fronts rarely move. When a low pressure system approaches, or when it is out of balance, the front changes temporarily to a warm front or a cold front. The following is a list of the most important information


Similar Different Autumn Rain Front in Different Autumn Rain Front

Autumn rain front is from late August to October It is a stagnation front that is said to develop in Japan in the second half of the year. This is a stagnation front. The stagnation front pushed northward by the increasing momentum of the Ogasawara air masses in summer is called the stagnation front. As it wanes, it dips to the south and disappears off the southeast coast of Japan around the end of October. It is the opposite of a rainy season front, which is active at first but wanes in the latter half of the year.


What type of air mass is it? What impact will it have


Okhotsk Sea Air Group

Okhotsk Sea Air Mass is a rainy season front and It is one of the air masses that is largely responsible for the development of the autumn rain front. It is a cold-zone oceanic air mass with moist, cold air from the Okhotsk Sea and the coast of Sanriku, and the Okhotsk Sea air The development and activation of the group is also a cause of the rainy season and other factors.


Ogasawara Kidan

The hot and humid summer is the main cause of This is the Ogasawara Air Group. The warm, humid breeze from the south clumps into a mass of air in the summer. It develops in tropical marine air masses.


Equatorial Air Group

Equator, which is somewhat far from Japan A warm and moist air mass in the vicinity is called an equatorial air mass. In summer, a tropical cyclone develops and brings it over Japan.


Frontline Basics

2 Two different air masses The boundary plane that collides and touches each other is called the frontal plane, and the part that touches it is called the In the case of a front, it is called a front. An air mass that is a mass of cold air is called cold air, and a warm air mass is called warm air. Two types of fronts, such as a cold front and a warm front, are said to occur depending on how the two collide. . When a front occurs, the area approaching the front is bad weather. There is a big difference in terms of how the weather becomes worse and what happens after the front passes, etc. The following is a list of the most important information


There are many other types of fronts There is

Autumn Rain Front

Autumn rain front is a front whose season is from summer to autumn. It appears around the turn of the season, and may start to appear as early as late August. The Pacific High, which generates hot weather, weakens and the Okhotsk Sea Pressure approaches Japan, causing summer heat. and the cool autumn air collide, which creates an autumn rain front.


Warm front

Warm front has warm air mass It is caused by contact with a cold air mass, such as a cold front, as it moves through. When a warm front passes through, the temperature rises gradually and turbulent clouds develop. Weak rain falls for some period of time and becomes more active as warm air flows from the East China Sea to the warm front. The likelihood is greater, and severe thunderstorms can occur, such as when a cold front passes through.


Cold Front

When a cold front passes For a short period of time, it will become torrential rain and after it passes, the temperature will drop. It won't last long, but thunderstorms and wind gusts are possible in a short period of time. If the temperature difference is large, tornadoes are likely to occur.


Closing Front

Warming front from a temperate low and The cold front is faster and larger than the cold front, so the cold front is closer to the center of the low pressure system and catches up with the warm front and becomes a blockage front. If there is a slight temperature difference between the cold air in front of the warm front and the cold air behind the cold front, and air-to-air contact A low pressure system with a blockage front because the warm cold air above is going up, and the low pressure system with a blockage front means that the warm air is pushed up into the sky. It is weakened by


Stagnation Front

The momentum of the warm and cold air masses This is a front that occurs when the two fronts are in contact with each other at the same level or in a state of motion. A stagnant front is formed when the wind direction and direction of the front are equal. It becomes more active when warm air flows in from over the South Sea, which can lead to large cumulus clouds and heavy rainfall. There seems to be.



The rainy season front and two air masses A rainy season front occurs when they collide and compete with each other. Basically, the weather is not violently disrupted, but in some cases, torrential rains and cumulus clouds occur. It seems to be a possibility.

How a rainy season front develops and how it works