Undergraduate Air Battle Manager Training (UABMT) Block 1 Practice Test

Fog forms when the air near the surface becomes saturated and water vapor condenses into tiny droplets. This happens best when there is abundant condensation and the air moisture is near the dew point, leading to a small temperature/dew point spread. Light winds help this process by keeping the air stratified close to the ground and preventing rapid mixing with drier air above, which would otherwise raise the dew point spread and disperse the droplets. Strong surface winds, on the other hand, mix the air more vigorously and tend to bring in drier air or lift and disperse the fog, making it much less likely to persist. So strong surface winds are not typical of fog formation.