The atmospheric pressure at its centre was getting down to a record set in the late 1930s.
Meteorological centres monitor central Pacific sea-surface temperatures and atmospheric pressure across the ocean.
This heating influences atmospheric pressure and appears to be slowing the westerly jet stream, Vavrus said.
The standard atmospheric pressure of 760 mm Hg exerted at mean sea level may fluctuate by 15-20 mmHg, under normal weather conditions.
While inside, atmospheric pressure is amplified and the patient is enveloped with 100 percent oxygen.
The Xoom has a built-in atmospheric pressure monitor that Lam thinks could be used to help people navigate large indoor spaces.