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Humid air is less dense than dry air because a molecule of water (m ≈ 18 Da) is less massive than either a molecule of nitrogen (m ≈ 28) or a molecule of oxygen (m ≈ 32). About 78% of the molecules in dry air are nitrogen (N 2). Another 21% of the molecules in dry air are oxygen (O 2). The final 1% of dry air is a mixture of other gases.
Monsoon air masses are moist and unstable. Superior air masses are dry, and rarely reach the ground. They normally reside over maritime tropical air masses, forming a warmer and drier layer over the more moderate moist air mass below, forming what is known as a trade wind inversion over the maritime tropical air mass.
Humid heat is the constant-pressure specific heat of moist air, per unit mass of the dry air. [8] The humid heat is the amount of heat required to change the temperature of unit mass of a water vapor - air mixture by 1 °C.
Precipitation occurs when evapotranspiration takes place and local air becomes saturated with water vapor, and so can no longer maintain the level of water vapor in gaseous form, which creates clouds. This occurs when less dense moist air cools, usually when an air mass rises through the atmosphere to higher and cooler altitudes.
The trough attracts moist air from the encompassing oceans and this inflow of moist air is referred to as the monsoon. [ 7 ] During the "active" phase or "bursts", large regions of cloud and rain are formed, where there is a constant northwesterly wind on the north area of the trough, alongside heavy rainfall on the land, which last from about ...
According to AccuWeather, warm, humid air from the south will collide with Arctic air from the north as a low pressure system moves east — atmospheric ingredients that could trigger accumulating ...
In the colder months, the cycle is reversed. Then the land cools faster than the oceans and the air over the land has higher pressure than air over the ocean. This causes the air over the land to flow to the ocean. When humid air rises over the ocean, it cools, and this causes precipitation over the oceans. (The cool air then flows towards the ...
"As the moist, warmer air overrides this entrenched cold air at the surfaces, there will be a threat for freezing rain and icy conditions Monday into Monday night across parts of upstate New York ...