This is one of the ones that I managed to miss, so I'm sorry for the late reply. But hey, you get a bump, so it's not all that bad is it?
This poem is a great example of the poetic imagination. Looking at the storm inspires so many thoughts in you that it nearly brings you to tears, as you describe... but even the tears would hiss at you... what an interesting concept. I think that I understand, though. Crying is like opening up all the old wounds to bleed again. If the storm would inspire such sorrow in you, actual tears would be infinitely worse, so you feel that you must hold it in...
You, my friend, have the soul of a poet.
Poets are the unacknowledged legislators of the world.
~Percy Bysshe Shelley