First off you need the air temps to be stable for a period of time as such they are doing now, we need night time temps in the 50's to start the process and stable warm temps during the day as well to have any degree of consistency. Yes you can catch them without the for mentioned but you will work much harder for them and not have the consistency, not to say that any periodic warm front during this time will not spur some activity, right place right time in that scenario. Once the temps have leveled out as they appear to have, it's go time! As far as where, consider where you have been fishing as the bass have moved up to the banks and or flats for their spawning ritual. Take into consideration the deeper water channels and drops, deep coves leading into spawning areas and cuts in the channels adjacent to drop offs and large structure as rock ledges and boulders and possibly large downed trees near these areas, bluff banks are also productive as bigger bass prefer deeper water as a escape route. There are numerous scenarios depending on the environment where you are fishing. As far as methods of producing big fish at night without a doubt a black, black & blue, black & purple, black & red, and even a white spinner bait & trailer is a proven method time and time again but as always never limit your arsenal to just a couple of baits, worms, craws and jigs are all options as well as others. On top of that I would also recommend a clear fluorescent fishing line along with a black light so you can see your line. Last but not least, make sure your hooks are sharp, you don't want to lose that hog once he is on the end of your line!! Add all that to many years of trial and error and you will become a successful night time bass fisherman