So, three guesses about what you are seeing in the picture below.
OK OK, I don’t have the patience to wait. What you see is ice/Hail at the mouth of a rain gutter downspout diverter. Yes the pic was taken on what rapidly became a bright sunny day.
Just 15 minutes prior was a dark, lighting display, windy, ominous Hail storm which led to many insurance claims for shingle damage.