What type of cloud will be formed if very stable moist air is forced upslope?
What type of clouds will be formed if very stable moist air is forced up slope? Stratified clouds with little vertical development.
What happens when warm moist air in the atmosphere is called?
5.2 Convection Rainfall This warm air rises and cools as it goes higher. At a certain point, condensation will occur and clouds will form. If the air is humid, the cloud base will be low. The size and shape of convection clouds depends on the humidity of the rising air and the strength of the convection.
What are characteristics of moist unstable air?
What are characteristics of a moist, unstable air mass? Turbulence and showery precipitation.
What is a characteristic of a stable air?
Explanation: The following are characteristics of stable air: stratiform clouds continuous precipitation smooth air poor visibility.
What is upslope fog?
Upslope Fog: This fog forms adiabatically. Adiabatically is the process that causes sinking air to warm and rising air to cool. As moist winds blow toward a mountain, it up glides and this causes the air to rise and cool. The cooling of the air from rising causes to meet up with the dew point temperature.
What type of cloud forms when warm moist air overrides a layer of cool air?
Because they form in conditions unfavorable to vertical development nimbostratus clouds never produce heavy rains or thunderstorms. Nimbostratus clouds are associated with warm fronts where warm moist air gradually overrides colder air at the surface. Visibility is very low beneath nimbostratus clouds.
What happens when air becomes warm?
As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.
What happens to warm moist air as it moves up a mountain?
Dense masses of warm, moist air that move up and over a mountain swell as the air pressure confining them drops away. The air becomes colder in the same way as a pressurized spray can's contents become colder when the can's pressure drops rapidly. (The phrase that describes this phenomenon is adiabatic expansion.)
Why is warm moist air unstable?
Air is considered unstable in the lowest layers of an air mass when the air is warmer and or more humid than the surrounding air. When this occurs the air will rise as that air parcel is warmer than the air surrounding it. In an unstable environment the weather can change suddenly and can be violent.
What makes air stable or unstable?
What makes air stable or unstable? It is the vertical profile of temperature, or lapse rate of the atmosphere, which determines whether an air mass is stable or not.
What does stable air mean?
A stable atmosphere will have largely flat layers of cloud which, although they may exhibit some lumpiness, will not extend far upwards. There may be several such layers or occasionally, clear skies.
What causes stable air?
The atmosphere is said to be absolutely stable if the environmental lapse rate is less than the moist adiabatic lapse rate. This means that a rising air parcel will always cool at a faster rate than the environment, even after it reaches saturation.
What is an upslope?
Definition of upslope : being or moving to or toward the top of a slope : uphill upslope winds.
When warm humid air travels up a slope and cools past its dew point?
water evaporates from the lake surface. As the water vapor cools, it condenses. The fog appears like steam. Warm humid air travels up a hillside and cools below its dew point to create upslope fog.
When warm moist air is cooled?
If warm moist air rises, it will expand and cool. As it cools, the relative humidity will increase and water will condense. It can then fall back to the earth as precipitation.
Why does warm moist air form clouds when rises?
That warmed air starts to rise because, when warm, it is lighter and less dense than the air around it. As it rises, its pressure and temperature drop causing water vapor to condense. Eventually, enough moisture will condense out of the air to form a cloud.
What happens when air becomes warmer and drier?
Often, as the leeward air plunges down the slope, it warms quite dramatically and rapidly. Such rapid warming and drying of air can produce very high winds known as Chinook or Foehn winds.
What happens to the warm moist air on the surface of the ocean?
Air warmed by ocean currents picks up a lot of moisture. As the heated air rises, it expands, which is measured at the surface as low air pressure. Expanding air cools, which forces it to lose its moisture as rain or snow.
What happens to the warm air?
As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.
What is stable and unstable air?
Stable air means that the weather is likely to be calm. It may rain or snow slowly and steadily it may be sunny but the weather will not change quickly. Unstable air means that the weather might change quickly with very little warning.
Why moist air is unstable?
As a result of the latent heat that is released during water vapor condensation, moist air has a relatively lower adiabatic lapse rate than dry air. This makes moist air generally less stable than dry air (see convective available potential energy (CAPE)).
What is the stable and unstable atmosphere?
The clearest way to observe the difference between a stable and an unstable air mass is to look at the clouds: A stable atmosphere will have largely flat layers of cloud which, although they may exhibit some lumpiness, will not extend far upwards. There may be several such layers or occasionally, clear skies.
What is an upslope event?
The term “upslope storm” is used to describe a winter storm that occurs along the eastern slopes of the Rocky Mountains and on the Plains directly east of the mountains. ❑ These storms occur with low-level winds that have an easterly component. ❑ Upslope storms can produce enormous amounts of snow.
Can it snow upwards?
Snow can definitely go up, sideways, and any which way if there's enough wind to move it. Updraft doesn't necessarily mean wind in the same way you might be used to. A small difference in temperature in ground level and higher up is quite enough to cause snow to move up.
When warm humid air travels up a hillside and cools below its dew point the following type of fog forms?
(1) Advection fog. Advection fog forms due to moist air moving over a colder surface, and the resulting cooling of the near-surface air to below its dew-point temperature.
When cold dry air moves over warm moist ocean this fog will form?
3) Steam Fog Common during cold weather months over bodies of water, steam fog forms when cold and dry air moves over warm water. This type of fog tends to be very low-level, affecting seaplane pilots and pilots flying on runways next to the water.
What happens warm air?
As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.
Does warm moist air rise?
If warm moist air rises, it will expand and cool. As it cools, the relative humidity will increase and water will condense. It can then fall back to the earth as precipitation.
Why does warm moist air form clouds when rises quizlet?
When the relative humidity reaches 100%, the air is saturated. Water vapor soon begins to condense in tiny droplets around small particles such as dust and salt. Billions of these droplets form a cloud.
What can form as warm moist air rises expands and cools?
Clouds Clouds form when moist, warm rising air cools and expands in the atmosphere. The water vapor in the air condenses to form tiny water droplets which are the basis of clouds.