Understanding atmospheric pressure is vital, newsroom meteorologist Justin Ballard said, because those giant H’s and L’s representing high and low air pressure systems on a weather map are ...

These clouds typically emerge several days before a rain-making system of low atmospheric pressure arrives ... us tell a deeper weather story. For example, at higher atmospheric levels, you ...

First, let’s learn how atmospheric pressure works The longer version ... with those clouds sometimes dropping rain as they pass. Here is a visual explanation, via the weather service: A trough ...