________is the instrument used to measure air pressure. barometer. Low pressure will usually bring what kind of weather? Stormy. Pressure is the effect of the weight of all the air above pressing down. High pressure will usually bring what kind of weather? clear and dry. Based on the information in the table, in which city will it most likely rain? City Z. Which weather condition will most likely occur when the atmospheric pressure in an area begins falling? rainy. Which kind of weather change will occur with an increase in air pressure? cooler and dryer. _______ pressure systems are characterized by fair weather. High. Which is the best indicator that precipitation is on the way? low pressure. What type of air pressure is present? High