Ooo...I love the tranquil and mysterious mood at the beginning. Sounds just like an impending thunderstorm indeed. It progresses rather slowly (but that's probably fitting for an ambient track). I love all the little string swells, like at 1:46 (and several other places). It has emotion, and a rather paralyzing mood. The progression is rather good. This is beautiful! I'm going to complain about one tiny detail: the note at 2:06 cuts off painfully suddenly. I would suggest both a) smoothing it out with some reverb and b) adding a volume automation to transition more cleanly into the next dynamic (because I'm not sure a subito piano quite fits in with such a flowing ambient track as this). Still, the instrumentation is marvelous, the mixing and mastering is top-notch, and the atmosphere is quite superior indeed. You've earned a fave and a DL. Congrats, and keep up the good work. ;)