BATON ROUGE, La. (NBC33) — As Isaac moves over South Louisiana, many people have mentioned their ears popping or their bones aching. Have your ears been popping? Or has your arthritis flared up? Go ahead, you can blame the weather.

It is very typical for people to experience these two issues due to nearby storms that bring unusually fast drops in pressure, like hurricanes. At 3:00 a.m. Wednesday, Baton Rouge's pressure was 997.4 mb. Twelve hours later, at 3:00 p.m. it was 985.1 mb; a drop of over 20 mb within half a day.

Oppositely, we'll see a rise in pressure as Isaac moves away over the weekend.

The National Weather Service defines pressure as "The pressure exerted by the earth's atmosphere at any given point, determined by taking the product of the gravitational acceleration at the point and the mass of the unit area column of air above the point."