Please translate to English with past tense

When I was on my way to school, the red raining signal was hoisted. Since I forgot to bring my umbrella, I was fully wet when I arrived at school.

I was on the way to the school, it got red sign heavy rainstorm. I fully soaked wet when I arrived the school because I forgot my umbrella.

1
On the way I went to school, there were a red storm, and I forgot to bring
the umbrella, I was soaked wet when I arrived to the school.
2
What I go to school just meet the red torrential rain during that time, I have
forgotten to carry the umbrella, already completely wet when I went to the
school.