Wow, that's a lot of monarchs! I was on the spit late Thursday afternoon and the monarchs started roosting after 5:30pm, in the same area we (my son and I) saw them last year. Last weekend we saw a few small clusters; this evening there were a few hundred in at least two separate roosts. If tomorrows weather isn't suitable for flying it could be a really great weekend for seeing roosts on the spit.