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

<em>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!</em>

<em>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.</em>

<em></em> 

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, 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

<em>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!</em>

<em>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.</em>

<em></em> 

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, 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

<em>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!</em>

<em>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.</em>

<em></em> 

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."

Original Entry in Black, Changes in Blue and Comments in Red. 

I'm a girl of 18 years, old and my name is Sigita:)

Expressing age as above is valid - just archaic (very old). Most people would say:
"I'm an 18 year old girl" 

Also, while it is an advanced subject, and definitely not expected of you, I would modify then conjunction. I would finally write the sentence as:

"I'm an 18 year old girl; my name is Sigita. :)" 

I am learning English because I want to pass my English exam, and maybe one day live in abroad. Of course, I want to make some friends who will help me. I was born in Lithuania, so my native language is Lithuanian. In my leisure time, I like to be with my friends and play VOLLEYBALL!! :)

A common mistake I've noticed with people just learning English is confusion on what exactly English infinitive verbs are. In most languages, an infinitive is just one word - in English, it is two: every infinitive verb starts with 'to.' So, when ever you use an infinitive verb form, like you did above with 'to make' be sure to add that 'to' in before the verb itself.