Imagineit is raining heavily. The wind is sporadic, but the lightening and thunder are almost rhythmic. Put a character in this setting or develop just the setting itself. Consider not just sound, but the vibration of the cracking thunder. Work in as much sensory detail as possible. Get inside the mind of your character as well if you included one. Just keep adding details and thought process until you feel it is finished. If you over do your description, no problem. Any piece of writing can be made useful, even it it just ends up being sold for parts.