Page "Barometer" Paragraph 5

Although Evangelista Torricelli is universally credited with inventing the barometer in 1643, Localized high atmospheric pressure acts as a barrier to approaching weather systems, diverting their course.

Atmospheric lift caused by low-level wind convergence into the surface low brings clouds and potentially precipitation.

The larger the change in pressure, especially if more than 3. 5 hPa, the larger the change in weather can be expected.

If the pressure drop is rapid, a low pressure system is approaching, and there is a greater chance of rain.

Rapid pressure rises, such as in the wake of a cold front, are associated with improving weather conditions, such as clearing skies.