They can sense changes in barometric pressure preceding a thunderstorm. (ka-hi.com)
In 2007 a study in the Archives of Gynecology and Obstetrics suggested that deliveries increase on days with a marked change in barometric pressure. (scientificamerican.com)
Prior to this study, most research in this area focused on the effects of rapid changes in barometric pressure, also known as overpressure. (sciencedaily.com)