The air pressure is high when the air is cold, and it's sinking.
cold and sinking
tornado Thermals, caused by hot ground heating the air close above it. Replaced by cold air sinking from above.
Sinking air, combines with dry weather and only a few clouds are indicators of a cold front. Cold air is heavier and more dense than warm air.
The process of warm air rising and cool air sinking is called convection current The process of warm air rising and cool air sinking is called convection current
Sinking air would add air to the surface, raising the pressure.
Rising warm air and sinking cold air .
Rising and sinking air is called up draft and down draft, respectively.
Cold air is sinking and flowing back toward the equator.
Convection.
Well, if the air is sinking then the temperature is dropping since hot air rises. When cool air comes down, if it comes down too fast, the hot air and cold air "clash" and that's what causes fog.
tornado Thermals, caused by hot ground heating the air close above it. Replaced by cold air sinking from above.