Stratus fractus

Stratus fractus are also known as 'messenger' clouds and can be seen creeping over this mountainous area in Spain.  They are small clumps or shreds of clouds.

If you happen to be in this cloud, you'll only get wet through the drizzle like moisture as these are unlikely to be effective in producing rain as they pass over.  It's possible the clouds above may cause rain and this will fall through the lower level Stratus fractus clouds in order to confuse people like me!