Interesting, but unfocused.
Although I like the many moods and atmospheres which the song creates, I feel like each section lacks support for the others. Kinda like one of those wooden bridges over a huge cliff that is supported by two ropes. Yeah, it gets the job done, but that thing isn't very tough, if you know what I mean.
Try to slowly transition from section to section over the course of approximately 5-10 seconds. Perhaps you could fade in the section, or you could have a few elements of each movement remain in the next for a certain portion of time.
Also, I feel as if the section at 1:10-1:50 should be at the beginning, followed by what you currently start with. A storm starts out as a drizzle most of the time, and then gradually intensifies before slowly or suddenly dying off.
Also in the 1:10-1:50 section, the clip you used for the melody kinda cuts short. I don't know if this was your intention, but it sounded a tad bit unprofessional. It's not a major issue though,
Otherwise, you've got an adequate work here. I like it.