Globally, a sinking air is associated with clear skies and sunny weather. When you have a cold, dry air mass at high elevations, this air mass will tend to descend, to sink quite slowly since the cold air mass is heavier and denser than the surrounding air. As the cold air descends, this one warms up by adiabatic, compressional heating. Adiabatic is a term which means there are no heat or thermal energy transfer between the system and the environment. Since the air warms up continuously, it will also dry out (the relative humidity will go down but the absolute humidity will remain the same) because a warm air (light, dilated and takes more space) can hold more water vapor than a cold air (heavy, dense and takes less space). This adiabatic process will promote the evaporation within the air parcels, which will thus dissipate clouds and prevent precipiation formation.
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.
high pressure.
No, that's high pressure. High pressure has sinking air and fair weather. Low pressure is rising air and usually brings lots of clouds and precipitation.
Generally with high surface pressure, there is sinking air and clear skies. With low surface pressure there is rising air with clouds and precipitation given sufficient moisture.
High clouds indicate the dry air and high pressure of fair weather. so it is true
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.
high pressure.
No, that's high pressure. High pressure has sinking air and fair weather. Low pressure is rising air and usually brings lots of clouds and precipitation.
Cumulus clouds cause fair weather, but cumulonimbus on the other hand don't, they cause thunderstorms and severe weather. Cumulus clouds can occur on fair weather days because of areas of rising and sinking air from the surface. This is typical of a conditionally stable atmosphere. Cumulonimbus clouds are the result of frontal lifting, allowing air rising to tap into atmospheric energy and therefore allowing the air to rise on its own without further frontal lifting required.
Generally with high surface pressure, there is sinking air and clear skies. With low surface pressure there is rising air with clouds and precipitation given sufficient moisture.
Sinking motion in high-pressure air masses makes it difficult for air to rise and clouds to form. That's why high pressure usually means good weather.