When checking the weather what does the pressure tell you?

Question

When checking the weather what does the pressure tell you?

In: 503

Answer 1

Just like warm water can hold more salt or sugar in solution than cool water, “high pressure” air can hold more moisture than “low pressure”. High pressure days therefore have lower humidity (more room to hold more liquid) and low pressure days will have higher humidity, and might even rain since the air can’t hold as much moisture in it, with excess falling out of the sky as rain.