“Nimbo” refers to rain and “stratus” is a layer so this low-level cloud layer lightly rains and casts a gray ceiling overhead. This picture was taken in Seattle where this is a common sight throughout especially the winter. You can’t really tell that it’s raining from this picture because the raindrops are very small. Light, consistent rain is the norm from this featureless cloud.
Location: Seattle, Washington
Date: March 2014