Adele at the 28th Annual MTV Video Music Awards at the Nokia Theater in Los Angeles - 28 August 2011 Stock Photo - Alamy

SOLVED:Hurricane Irene registered an atmospheric pressure of 982 mbar in August 2011. Hurricane Katrina registered an atmospheric pressure of 86.2 kPa in September 2005 . What was the difference in pressure between the two hurricanes in (a) millimeters of mercury, (b) atmospheres, and (c) millibars?

In August 2011, following Hurricane Irene, CBP officers in New Jersey conducted operational checks and prepared emergency equipment to assist with recovery efforts for victims of the storm in the region Stock Photo - Alamy

In late August 2011, Hurricane Irene ripped through Pennsylvania. This State #Archives video from Aug. 28, 2011 shows incidents of devastation throughout southeastern Pennsylvania. A state of emergency was declared across the commonwealth, and assistance was sought from the Federal Emergency Management Agency. Commuter rail service halted, and the Philadelphia Airport closed. #OnThisDay | Pennsylvania Trails of History