Watch VoirFilms. The film features a character named Wesley, who is in training at the Weather Bureau of Investigation. He learns about different air masses, their movements, and how they interact to cause weather changes. The training includes understanding high and low pressure systems, cold and warm fronts, and observing changes in weather conditions using various instruments. Wesley experiences firsthand the transition from a warm air mass to a cold front, noting changes in temperature, wind direction, and cloud types.