I saw aon the news that ithere was a record heavy snow on the Sea of ​​Japan side of the country.

Yellow sand is a phenomenon whichere Chinese desert sand come over to Japan by the wind.

Usually, Iit is observedseen in spring, so it is rare to be observedseen in winter.

"observed" in the passive tense is mostly used for holidays and traditions eg. "Christmas is observed on December 25th"

It snowed heavily just as Mr. Mori said, so I thought weather forecasters are amazing.

A more natural phrasing "When I saw that it ended up snowing heavily just as Mr. Mori said, I was amazed at the accuracy of weather forecasters."

It was interesting that it seemed to be not related between yellow sand and snowthe yellow sand and snow seemed not to be related, but actually they did.were.

I saw athe news that it was a record heavy snow fell [on the Sea of ​​Japan side of the island | on the west side of the island | on the coast of the Sea of Japan].

Does “Sea of Japan side” mean “the side of the island that is nearest to the Sea of Japan” (the west side of the island)? Or do you mean “on the coast of the Sea of Japan”?

I saw aon the news that it was a record heavy snow on the Sea of ​​Japan side.

Or, "I saw on the news that there has been a record heavy snow on the Sea of Japan side of the country" ?

Yellow sand is a phenomenon in which Chinese desert sand come overis carried to Japan by the wind.

Usually, Iit is observed in spring, so it is rare to be observedseeing it in winter.

It wais interesting that it seemed to be not related betweens yellow sand and snow are unrelated, but actually they didre might be a connection.

I saw awatched news that itsaid there was a record heavy snowfall on the Sea of ​​Japan side.

また、

I watched news that said there was heavy snow falling on the Sea of ​​Japan side.

I remembered that Mr. Mori, a weather forecaster, said on TV a little while ago that yellow sand was observed in December andso that there was a possibility of heavy snowfall in such years.

Yellow sand is a phenomenon whichere Chinese desert sand comeis blown over to Japan by the wind.

Usually, It is observed in sSpring, so it is rare to be observed in winter.

It was interesting that it didn't seemed to be not related betweento yellow sand and snow, but actually they didit was.

I saw a news that itarticle/report that there was a record heavy snow on the Sea of ​​Japan sidearea.

日本海側を直訳すると、「Sea of Japan side」になりますが、[Sea of Japan area]のはもっと適切だと思います。

Yellow sand is a phenomenon in which Chinese desert sand comes over to Japan by the wind.

Usually, Iit is observed in spring, so it is rare to be observed in winter.

It snowed heavily exactly as Mr. Mori said, so I thought weather forecasters are amazing.

Using "exactly" here shows that the weather report was very accurate. This adds more to your amazement of weather forecasters.

It was interesting that it seemed to be not related between yellow sand and snowthe yellow sand and snow seemed to be unrelated, but they actually they didwere.