If you are lucky enough to be in the right place at the right time, there are some good sulphur hatches coming off on the White River system here in the Ozarks. You only need two flies in my opinion. The PT nymph and the parachute sulphur will match the dry or sub-surface sulphur. You can get by with some bigger flies with this hatch. I have been throwing size 14 dries. There are few things more fun than watching a fat cutthroat rise on a big dry. Get out and enjoy!