Cold low pressure + hot ocean "Wrong Meeting"...50cm. "Snow bomb".

[Anchor]
This time, we will investigate the cause and prospects of the unusual snow bomb with a reporter.

Kim Min-kyung is in the YTN weather and disaster reporter studio.

Since the night before yesterday, snow bombs have poured down.

Which area had the most snow?

[Reporter]
Yes, Baekam-myeon, Yongin-si, Gyeonggi-do, is 47.5cm, and snow has accumulated close to 50cm,
More than 40cm of snow accumulated in Gwangju, Gyeonggi Province, Gwanak, Seoul, and Jincheon, Chungcheongbuk-do.

The official observation station in Seoul also recorded 28.6cm, ranking third in the amount of daily snow ever recorded.

[Anchor]
By the way, why did you get more rain in Gwanak-gu even though you are in the same Seoul?

[Reporter]
Yes, Gwanak-gu has a high altitude of about 141m.

As the ground is high, even in the same Seoul, the lowest temperature this morning was minus 0.1 degrees Celsius in Seoul, but minus 0.8 degrees Celsius in Gwanak-gu.

When snow is in the form of "wet snow" like this, the difference in the amount of snow can widen even in such a slight temperature difference.

[Anchor]
Usually, when it snows, the area near the mountains of Gangwon-do always seems to have fallen the most, but this time it was concentrated in the west, such as the metropolitan area or Chungcheong-do, why is that?

[Reporter]
I'll take a look at the diary, too.

It's 5km above the atmosphere.

This yellow and red round mass is a low pressure that stagnated in the northern upper layer of Korea.

The drooping part toward Korea is called a valley, so it is expressed as a 'gol'.

Clouds develop well around here,

The reason is that this goal was located in the metropolitan area and near Chungcheong Province from last night to this morning.

[Anchor]
Why did you get so much rain?

[Reporter]
Yes, it was the 'wrong meeting' between the cold low pressure and the hot ocean.If you go back

further, it's because the upper atmosphere is 'blocking', that is, because the air flow is stagnant.

That's because the low pressure kept spinning in place like a cogwheel, sending very cold air down to the north below minus 30 degrees.

The problem is that the cold air sent by this low pressure passed through the relatively warm West Sea.

The red color on the left side of the graphic is a place where the sea level temperature is higher compared to the average year, and the darker the color, the greater the difference.

Currently, the temperature in the West Sea is 15 degrees, which is about 2 degrees higher than usual.

But the temperature of 1.5km above the atmosphere is about minus 10 degrees, so
The difference between the temperature of the atmosphere and the temperature of seawater in
is as large as 25 degrees.

The larger the temperature difference, the stronger the cloud,

The cold air keeps coming down, and as it passes through the relatively warm West Sea, strong snow clouds continue to enter our country and pour heavy snow.

[Anchor]
The snow piled up and the damage of the collapse continued, and it's a problem because of the fallen leaves?

[Reporter]
Correct.

Do you remember that there was a lot of wind right before it snowed?

Due to strong winds, maple and ginkgo leaves fell, and as rain or snow fell without being cleared throughout the walking path, the fallen leaves were frozen and snow was added, making it more slippery.

Even in alleys and pedestrian paths where the sun doesn't set well, there are still many places piled up, so you should walk carefully not to fall when walking on the street.

[Anchor]
It seems like the snow has stopped in Seoul, how is the situation in other regions?

[Reporter]
Yes, let's look at the radar screen where you can see the movement of snow clouds.

As the snow cloud gradually moved south, the Seoul metropolitan area, such as Seoul, and Gangwon, almost stopped snowing.

However, snow clouds continue to flow in Chungcheong and Honam regions, so snow is expected to continue until tomorrow.

By tomorrow morning, 5 to 15cm more snow will fall in the mountains of Jeju, 1 to 5cm in Chungcheong and the south, and 1 to 3cm more in southern Gangwon and the mountains.

[Anchor]
I bought a 50-year-old crash in Wonju, Gangwon-do yesterday, and the road freezes at night, but will the road freeze tonight because it's cold again?

[Reporter]
Yes, even if most of the snow stops, I'm worried because the temperature is low.

Even now, it's 3 degrees, and the temperature is not very high.

On top of that, if the temperature drops again from the evening, there is a high possibility that the melted snow will now freeze as it is,

Tomorrow morning the temperature is lower than today, so Seoul will drop to minus 4 degrees Celsius.

I'm also worried about getting off work today, but I'm more worried about slipping on my way to work tomorrow.

Highways and large urban roads with high traffic and good snow removal work will be fine, but special attention should be paid to sliding accidents in bridges, tunnel entrances, and alleys.

[Anchor]
The snow will start again from tomorrow afternoon?

[Reporter]
Yes, the atmospheric congestion has been resolved, but snow is expected to fall again in the Seoul metropolitan area, where snow stopped during the daytime tomorrow as the remaining pressure trough temporarily affected it once.

Fortunately, most of the snowfall is 1 to 5cm during the day tomorrow, which is expected to be significantly less than yesterday and today.

[Anchor]
I used to wear short sleeves only two weeks ago because it was hot, but now it seems like the season is overshadowed by the snow bomb in the cold?

[Reporter]
September, October, and November are usually called fall.

Just looking at November alone, the record is enormous.

Even though it was November, the highest temperature in Seoul rose to 25.1 degrees in early November, but yesterday the highest temperature was 1 degree, and within a month, the temperature was more than 20 degrees.

In the beginning, water bombs reminiscent of the rainy season of more than 200mm were poured into Jeju, and now it is no exaggeration to say that they have experienced four seasons in a month, including snow bombs.

[Anchor]
All the causes are due to the increased sea temperature?

[Reporter]
Correct.

First of all, the Jeju water bomb at the beginning of this month was indirectly affected by Typhoon 'Kongrey'.

This month, for the first time in 30 years, four typhoons were active at the same time in November.

This is because the sea temperature in the western Pacific Ocean, where typhoons develop, was high until November, making it a good condition for typhoons to develop.

Record-breaking summer heat waves, tropical nights, late heat that extended to Chuseok, and this snow bomb are all attributed to the increased sea temperature.

[Anchor]
But actually, the difference between 1 and 2 degrees in temperature doesn't feel real, but the difference between 1 degree and 1 degree in seawater temperature is big?

[Reporter]
Correct.

Ordinary sea water temperature increases by about 7% when the temperature increases by 1 degree.

It does not mean that the amount of water vapor in the atmosphere increases by 7%, but that the capacity of the water tank in which the atmosphere can contain water vapor increases by 7%.

Increasing water vapor means that there are more materials in the atmosphere where clouds are formed.

In addition, there is an analysis that when the sea temperature increases by 1 degree, the wind speed of the typhoon increases by about 32 kilometers.

[Anchor]
I'm worried about winter because it was heavy snow from the first snow, but Samhansaon has become an old saying?

[Reporter]
Correct.

Usually, when we think of winter in Korea, three days are cold and four days are warm 'Samhansaon'.

But I think it's a word that doesn't fit anymore.

Last winter, it was very cold in the beginning and then warmed up, and from the middle of the year, it was cold as the Arctic cold wave lasted for about 10 days.

It was so-called "9han11 On."

This winter is also expected to have a long repetitive cycle.

In fact, this cold continues for nearly 10 days until next week, and after that, there is a possibility that another cold spell will fall south at the end of this year after similar weather to normal temperatures.