Which of the following is NOT considered a hazard associated with surf rescues?

High air temperatures are not typically classified as a hazard specifically associated with surf rescues. While extreme heat can pose health risks like heat exhaustion or heat stroke to both lifeguards and individuals at the beach, it doesn't directly impair the safety of surf rescues in the way that the other options do.

Rip tides can create an immediate and dangerous situation for swimmers, posing a significant risk during rescues as they can pull individuals away from the shore rapidly. Unstable debris can result in physical injuries or obstructions that complicate rescue efforts, especially after storm events or due to wave action that creates hazardous conditions. Crashing waves can lead to injuries and drowning, making them a critical hazard to consider during rescues in surf conditions.

Thus, while high air temperatures are an important consideration for overall safety and wellbeing at the beach, they do not directly impact the mechanics or risks involved in surf rescues.