While it might seem like an unbending fact, the boiling point of water actually varies depending on where you are. Here's ...

so as water vapor increases, the density of air decreases. Temperature also changes the density of air. As air gets warmer it expands and becomes less dense, causing atmospheric pressure to fall.

When Earth first formed, it was too hot to retain ice. This means all the water on our planet must have originated from ...

When a front moves through or on just a regular day we can see middle tiered clouds here at home. Altocumulus clouds ...

A second round of rain is expected to fall over the Bay Area on Thursday into Friday morning, along with flood warnings, high ...