The leading edge of this monsoon is associated with a feature called the monsoon trough, a region of low atmospheric pressure at sea level. (britannica.com)
You report on low atmospheric pressure stunning as a more humane method of slaughtering chickens (3 February, p 8). (newscientist.com)
Lead author Jeff Knight, from the Met Office, said: «The record rainfall in the UK in winter 2013 - 14 resulted from persistently very low atmospheric pressure over the North East Atlantic Ocean, which was part of a disrupted pattern in the atmosphere across the Northern Hemisphere. (phys.org)