We begin with cloud cover.  If you have friends or family interested in the eclipse, please refer them to this site.  Essentially, there are three types of clouds: cirrus (high clouds), "alto" (middle clouds) and cumulus (low clouds). Low clouds will completely blot out the eclipse. Most alto will, also. When it comes to cirrus clouds, it depends on the thickness. BTW, all of these photos are my own.  Here are examples: these are high thin cirrus clouds. They will not cause a problem except to, perhaps, make the corona more difficult to see. Below are cirrus clouds. The higher, thin cirrus clouds? Not much of a problem. The thicker cirrus will definitely dim the corona if one is between you and the sun. Below are relatively thin altostratus/altocumulus clouds. The sun is at upper left. While there is a lot of glare, the solar disc was not crisply visible  The lower, the thicker clouds will completely obscure the clouds.  The Cloud Forecasts This forecast was der...