What causes the 'calm before the storm'?

Question

The old adage "The calm before the storm" certainly has an observational scientific meaning to it -- something that many (including myself) have experienced -- that on a hot summer's day, when a change in the weather starts rolling in, humidity rises, but it becomes very calm with little to no wind, before the storm begins. *(This of course is not the only phenomenon associated with a change in weather).* **What confluence of meteorological factors results in the 'calm before the storm'?**

Answer 1

Storms and forming storms pull in warm, moist air. This is due to them having low pressures, updrafts wind winds. The pulling of air in can clear clouds up and negate wind that was in opposite direction or make a low pressure spot. In low pressure spots wind can die, if there is no high pressure nearby. Example, if you suck air out of something that is enclosed at first you may experience wind or air movement but eventually they will be no air movement as you have sucked up a certain amount of air. This doesn't always happens and needs many right conditions to occur. The other reasons is humans naturally find patterns and notice more extreme patterns (especially sudden changes) so while this is real, us humans exaggerate its occurrence.