The pollen cloud that swept from east to west across the lake Thursday evening was actually triggered by the seabreeze front pushing inland. By the time it gets here, it's warmed up and is noticed as nothing more than a wind shift. The 15mph breeze it brought on an otherwise calm day was enough to cumulatively build up a rather crazy density of pollen. The number of white pine around the lake made it especially brutal.
It rolled through my yard as if it were a heavy snow squall, it was pretty interesting. It occurred today as well, but to a much lesser extent. I was actually disappointed because I set up my camera and was going to shoot a time lapse video of it passing through.