Luke Howard's Barometer

Origin
Luke Howard was a chemist and amateur meteorologist who created the modern naming system for clouds. His ordering classified the clouds into three main types and took special care to denote the various transitions between each group.

Effects
This barometer once owned by the "Father of Meteorology became imbued with the ability to raise or lower the density of clouds. If used enough times, the clouds become too dense and may fall down crush what ever is below it.