Final answer:
Skiers care about katabatic winds because they can create hazardous skiing conditions due to their potential strength and the sudden change they can cause in the environment.
Step-by-step explanation:
Katabatic winds are local, gravity-driven cold winds that flow downhill and can occur at nighttime. As for why skiers care about katabatic winds, it is due to the fact that they can create dangerous conditions for skiers.
Katabatic winds can be quite strong and have the potential to unexpectedly change the conditions on the slopes, thereby making skiing hazardous. Therefore, skiers must be cautious of these winds and stay informed about weather conditions before setting out.