Reported 647 across the US, 162 in Washington. Obviously that number is severely limited by testing capacity. But they are the only numbers to go with, everything else is just guessing.
Given that we know testing is behind, and that patients take about five days (?) to show symptoms, and that it's an exponential growth phenomenon, and that we have several other countries farther along in the process to observe, I'd say an educated guess is a lot better to go with than those numbers.
