Snow

Today, since this morning, it's snowing a lot and it never stops. Because of all the snow on the roads the buses are no more allowed to drive, and consequently all the students who usually come back from school by bus were authorized to leave school before the normal hour. Thanks to that I left school at noon instead of 5:30pm... That was really great!
And now, as it's still snowing and as the weather forecast says that it will continue to snow until Wednesday, all the schools in the county will probably be closed tomorrow and maybe Wednesday as well.
I love snow :D

It's been snowing since this morning, and won't stop. The buses are not allowed to drive on the roads, because of all the snow on them, and consequently all the students who usually go home on a bus were authorized to leave school early. Thanks to that, I left school at noon instead of 5:30pm... That was really great!

And now, as [because] it's still snowing and the weather forecast says that it will continue to snow until Wednesday, all the schools in the country will probably be closed tomorrow, and maybe Wednesday as well.

Very well written overall. Your first two sentences were the only two that really stood out as unnatural. The first sentence's main problem is English's terribly confusing present tense system, so that's very normal. The other changes I made to that sentence were not necessarily technical, but rather because it's how I (as a native speaker) would have written it.

The second sentence you wrote began with 'because of.' This phrase is very, very common in English writing, but it is technically incorrect. Also, sentences should not (technically) begin with the word because. I also just replaced "are no more allowed" with just "not allowed" as this is how a native speaker would say it. If you wanted to maintain the specificity of "no more"  (which is unnecessary), you would say "no longer."

Snow today... or A snowy day...

It has been snowing a lot since this morning and it (never stops) hasn't stopped yet. Because of all the snow on the roads the buses are no longer allowed to drive, and consequently all the students who would usually come back from school by bus were authorized to leave school before the normal closing hour. Thanks to that, I left school at noon instead of 5:30pm... That was really great! 

And now, as it's still snowing and as the weather forecast (says) predicts that it will continue to (snow) do so until Wednesday, all the schools in the county will probably be closed tomorrow and (maybe) perhaps on Wednesday as well.

I love snow :D

C'est super la neige. Ton Anglais est très bon Gwena!

Snow

Today, since this morning, it's been snowing a lot hard and it never stops incessantly. Because of all the snow on the roads the buses are no more allowed to drivestopped, and consequently, all the students who usually come back from school by bus were authorized allowed to leave the school before earlier then the normal hour usual timing. Thanks to that, I left the school at noon instead of 5:30pm... That was really great!
And now, as it's still snowing and as the weather forecast says telling that it will continue to snow until Wednesday, all the schools in the county will probably be closed tomorrow and maybe on Wednesday as well too.
I love snow :D

Snow

Today, since this morning, it's been snowing a lot hard and it never stops incessantly. Because of all the snow on the roads the buses are no more allowed to drivestopped, and consequently, all the students who usually come back from school by bus were authorized allowed to leave the school before earlier then the normal hour usual timing. Thanks to that, I left the school at noon instead of 5:30pm... That was really great!
And now, as it's still snowing and as the weather forecast says telling that it will continue to snow until Wednesday, all the schools in the county will probably be closed tomorrow and maybe on Wednesday as well too.
I love snow :D

 Snow

Today, since this morning, it's snowing a lot and it never stops. Because of all the snow on the roads the buses are no more allowed to drive, and consequently all the students who usually come back from school by bus were authorized to leave school before the normal hour. Thanks to that I left school at noon instead of 5:30pm... That was really great!
And now, as it's still snowing and as the weather forecast says that it will continue to snow until Wednesday, all the schools in the county will probably be closed tomorrow and maybe Wednesday as well.
I love snow :D

It's been snowing since this morning, and won't stop. The buses are not allowed to drive on the roads, because of all the snow on them, and consequently all the students who usually go home on a bus were authorized to leave school early. Thanks to that, I left school at noon instead of 5:30pm... That was really great!

And now, as [because] it's still snowing and the weather forecast says that it will continue to snow until Wednesday, all the schools in the country will probably be closed tomorrow, and maybe Wednesday as well.

Very well written overall. Your first two sentences were the only two that really stood out as unnatural. The first sentence's main problem is English's terribly confusing present tense system, so that's very normal. The other changes I made to that sentence were not necessarily technical, but rather because it's how I (as a native speaker) would have written it.

The second sentence you wrote began with 'because of.' This phrase is very, very common in English writing, but it is technically incorrect. Also, sentences should not (technically) begin with the word because. I also just replaced "are no more allowed" with just "not allowed" as this is how a native speaker would say it. If you wanted to maintain the specificity of "no more"  (which is unnecessary), you would say "no longer."