I've always been told a high pressure situation will push the fish down while a low pressure system will bring the fish up. So far, this year, we have done well when the barometric pressure is stable - meaning it's not falling or rising. From my past as a trout fisherman, the fish will bite better in a low pressure condition. But fish will always feed each and every day, you just have to be where they are to take advantage. One thing I used to watch closely when I deer hunted was the Solunar Tables - it used the moon phases as well as the moon's position in the sky, relative to where you are, to predict major and minor feeding periods. It was pretty accurate most of the time. By that I mean it was accurate during stable weather conditions. I've found them to be reasonably accurate for crappie fishing as well. But there are really no absolutes. And then, there's the wind. East is least and West is best, or so they say. This one seems to be a good predictor of the bite. Around here, an East wind is usually swinging to the South bringing moisture up from the Gulf and a rapid barometric pressure drop as well - putting the fish down till things stabilize out. Just too many variables. Basically we fish when we can and try to ignore all the mysticism of crappie fishing.