I learned the hard way over the years that winter warming spells are more of a ruse than a guaranteed slugfest, especially if you hit the wrong type of water. On a big lake, water temperature is determined by weather and air temperatures averages over a long period of time. What that means is a week of above average air temps in December isn’t likely to affect the lake enough that bass will deviate from true winter patterns. As an example, bass grouped up on the bottom in winter are susceptible to bottom-bouncing baits. If a long enough heat wave occurs and does, in fact, alter the water temp significantly, those bass will scatter out, and hold higher in the column to soak in the warmer surface temp. Subsequently, they’ll become much harder to catch.