Yes, it is a mountain that is less than 3 miles high and in the flat earth model, the sun is never less than 2500-3000 miles high. And the coast is 133 miles away, so that is equivalent to a quarter standing on its edge and the water being 3.7 feet off to the side. At this same scale, the Sun in a flat earth model is constantly 70-85 feet above the earth's surface. How does the sun at that height above the quarter ever cast a shadow upwards? Even if the ocean was a perfectly flat mirror, the relatively focused reflected sunlight would reflect off at a similar angle to the angle at which it struck the ocean's surface and would miss the quarter completely.
Watch the video again that I linked to in order to see why the sun would never be even close to the horizon on a flat earth or less than 10 degrees above the horizon, let alone hidden from view behind the horizon for hours every night as you mentioned, and especially not from a 3 mile high vantage point that would have a much more distant line of sight to the west on a flat earth. Your pointing this out just further debunks the flat earth model as it supports the point of view that the video is providing, namely that the sun would never set or subsequently rise on a flat earth.
This photo shows the sun in the frame of the picture, so it cannot be proof of diffuse light casting a shadow with an umbra, since there is a more localized source (the sun) that is clearly present:
I can link to thousands of photos showing a shadow with an umbra that are cast by direct sunlight:
https://www.google.com/search?q=umbra+shadow&espv=2&source=lnms&tbm=isch&sa=X&ved=0ahUKEwikkZ-f6rXTAhVn34MKHdxnA9cQ_AUIBygC&biw=1529&bih=913#tbm=isch&q=shadow+cast+by+sunlight(Note that a picture of Rainier casting a shadow upwards is on that page of search results)
I am asking you for proof of a similar dark shadow cast when the sun is clearly blocked from shining on the object casting the shadow. The Rainier photo does not qualify.
The Paradise area is south of Rainier, not west-southwest. And again, most of that 700 inches of snow fell after October. In fact, only 4 inches fell in October,2011 in the Paradise area:
http://www.wrcc.dri.edu/cgi-bin/cliMONtsnf.pl?wa6898 Most early snow like that melts fairly quickly as the average daily high temperature in October at Paradise is 48 degrees, and the ground has not had time to freeze. Also Paradise as you mention is at 5,400 foot elevation. Most of the area west-southwest of Rainier is much lower elevation and so probably did not even see 4 inches that entire month of October, 2011.
I only see 3 or 4 fairly small lakes that are roughly on a west-southwest line from Rainier, and they are tucked into the hills/mountains in that area.
Finally, just saying "Nope" to one of my arguments is not a reasoned response backed up by evidence. The only relevant reply to your "Nope" would be "Yup".