Some folks may not be as browser savvy as you are.
What is so difficult about opening up the link in another window?
Not everyone on these threads is in the path of every storm, but are interested for various reasons anyway. NN has the threads down practically to a science and the majority of us are very thankful for how she does them.
And that is the last I will comment upon this subject.
Like I said....
It is not a big graphic. She posted it herself.
The main reason for these threads are for people in the path of the hurricane. Hence the limit on graphics (which I agree is a good thing).