Fronts are a part of the spawn every year. The crappie will just jump back to the staging depths. When the water temp starts back up they will move up with it. These fronts IMO are a good thing. It keeps fishing easier for longer. They will stay in the creek mouths and channels concentrated together. Then we know they are going to spawn soon as the water warms back up. This gives them a little more feeding time to fatten up before they spawn.