In hot conditions, especially if an individual is dehydrated, the body holds onto fluids. This means that urine production decreases in an attempt to conserve water. However, when fluid intake is adequate or when the individual finally gets access to water, the body responds by producing more urine.

The scene might begin with the character noticing the heat, perhaps walking through a desert, working outside on a hot day, or being stuck in a sweltering environment without access to a restroom. As the character continues to be in this environment, the need to urinate becomes more urgent.