May 2 at 8:46PM the ISS will be visible for 3 minutes at a max elevation of 72 degrees. Pretty high overhead. It will rise about 41 degrees above NW and set 19 degrees ESE. Tonight you could see it for 4 minutes just after 8:21 but it was low in the sky at only 30 degrees. Oh and you can see it again tonight at about 31 degrees but only for two minutes at 9:56pm. So if it isn't cloudy out.....
Also tomorrow if the shuttle takes off, it too will be visible high overhead at 88 degrees max elevation at 8.57. But that is only if it takes off tomorrow.