Since yesterday, we have observed the heavy snow in various places ofin Japan.

In general, the northwest and of Japan have thes heavy snow.

This is because there are high mountain ranges that runs north to south tohrough Japan like a spine, and in winter, moist wind from the northwest hits them, bringing snow.

So, in famous three of the three famous places of, Tokyo, Kyoto and Osaka, Kyoto haves relatively more snow because only Kyoto faces the northwest sea.

In Maizuru city, to the north of Kyoto city, it seems to have had 40 centimeters of snowfall.

However, that is not so heavy compared with the Tohoku and Hokuriku regions including Aomori and Niigata Prefectures, which have the most (or highest amount of) snowfall in Japan.

A Heavy Snow

Since yesterday, we have observed the heavy snow in various places of Japan.

In general, the northwest and of Japan have thes heavy snow.

"Northwest of Japan" is third-person singular (like he/she/it), so it uses "has".

This is because there are high mountain ranges that runs north to south toin Japan like a spine, and in winter, moist wind from the northwest hits them, bringing snow.

"High mountain ranges" is third-person plural (like "they"), so it uses "run".

In English, when saying something comes from a cardinal direction (north, south, east, west, northeast, etc), we always add "the" before.
For example:
The wind came from the north.
My family is visiting from the south.
The sun rises in the east and sets in the west.

So, inof the famous three places of Tokyo, Kyoto, and Osaka, Kyoto haves relatively more snow because only Kyoto faces the northwest sea.

"of" is used instead of "in" because something is being selected from a group. In this case, Kyoto is being selected from Tokyo, Kyoto, and Osaka. "Out of" can also be used and has the exact same meaning.
Some other uses:
I took two of the five apples.
Out of all the movies we watched, this one is my favorite.

"The" is used here because the three places are specific.

In Maizuru city, the north of Kyoto city, it seems to have had 40 centimeters of snowfall.

I'm not entirely sure why, but "The" sounds unnatural here.

Since yesterday, we have observed the heavy snow in various places ofin Japan.

In general, the northwest and ofin Japan have thegets heavy snow.

This is because there are high mountain ranges that runs north to south tohrough Japan like spine, and in winter, moist wind from the northwest hits them, bringing snow.

So, in famous threeamong the three famous places of Tokyo, Kyoto and Osaka, Kyoto haves relatively more snow because only Kyoto faces the northwest sea.

In general, the northwest and of Japan haved the heavyiest snow.

I guess you are trying to say that that area had the most snow of all areas. So you need to use the superlative form of heavy which is heaviest.

This is because there are high mountain ranges that runs north to south toin Japan like spine, and in winter, moist wind from northwest hits them, bringing snow.

So, in famous threeout of the three famous places of, Tokyo, Kyoto and Osaka, Kyoto have relatively more snow because only Kyoto faces the northwest sea.

In Maizuru city, the north of Kyoto city, it seems to have had 40 centimeters of snow had fallen.

However, that is not so heavya lot compared withto the Tohoku and Hokuriku region including Aomori and Niigata Prefecture, which haved the most amount of snowfall in Japan.