Can you give me any keywords or username to search for, i.e. 'storm', 'cloud', 'sunny'? If I put search for 'rain' in the title, I get everything with 'train' in it, which is a lot.
I used the Train DLS Website and set the type to "Textures (Environmental)" and did separate searches for sky , storm ,cloud, rain .
The type search limits the results so rain isn't returning too many false results.