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To understand why low pressure produces cloudy weather, there are several properties of air that we first need to understand:
1) Air is a mixture of gases, including water vapor. Clouds form when water vapor (gas) condenses into (liquid) water droplets.
2) Cold air can't hold as much water vapor as warm air can. (This is why you see your breath in the winter but not the summer; your warm breath is cooled enough in the winter that some of the water vapor in it condenses into liquid water droplets.)
3) Lowering the pressure of air causes its temperature to decrease. For example, if you let the air out of a tire, you will observe that the escaping air feels cold. (Likewise, compressing a gas raises its temperature; this is why the bottom part of a bicycle pump feels hot after pumping up a tire, for example. Both of these statements are contained in the equation PV=RT, the Ideal Gas Law.)
4)The pressure higher in the atmosphere is lower, because there is less weight of air pushing down. This is why people talk about the air being "thin" on mountaintops.
5)A low pressure system is a region of rising air.
--> So, a low pressure system is cloudy because it is an area of rising air (5), which cools as it rises because as a result of the pressure being lower higher in the sky (4), the temperature goes down (3). Since the temperature goes down, the water vapor in the air (1) condenses into water droplets (2), making clouds.
This is also why most clouds have flat bottoms--the bottom of the cloud marks the altitude that the pressure is low enough that the temperature is low enough that the water vapor can condense out into clouds.
What else can I help you with?
When air moves upward to areas of less pressure what often forms?
fog
Do clouds rise in the center of a low pressure or high pressure area?
Air rises in a low pressure area and sinks in a high pressure area.
Do clouds form during high or low pressure system?
Clouds are more likely to form during low pressure systems. As air rises in a low pressure system, it cools and condenses to form clouds and eventually precipitation. In high pressure systems, air sinks and inhibits cloud formation.
Are cumulonimbus clouds low or high pressure?
Low Pressure, A Low Pressure Area allows clouds to form, as a result, you can get a storm from a low pressure area.A High Pressure Area is the exact opposite, it doesn't allow clouds to form, you can get sunny weather from this kind of system.
Does it rain in low pressure areas or high pressure areas?
It is more likely to rain in low pressure areas because low pressure systems often bring rising air, which can cool and condense to form clouds and precipitation. High pressure systems generally bring more stable weather with sinking air, leading to clear skies and less chance of rain.
Do clouds form in high pressure areas or low pressure areas?
no
When air moves upward to areas of less pressure what often forms?
fog
High pressure areas tend to have more clouds and rainy weather?
High pressure areas are associated with clear skies and stable weather conditions due to sinking air suppressing cloud formation and precipitation. Conversely, low pressure areas are more likely to bring about cloudy and rainy weather as the rising air cools and condenses to form clouds and eventually rain.
Do clouds rise in the center of a low pressure or high pressure area?
Air rises in a low pressure area and sinks in a high pressure area.
What kind of weather is associated with areas of high pressure?
Normally, High Pressure doesn't allow clouds to form. That means it would bring sunny weather.
Do clouds form easily when the air pressure is high or low?
Clouds are more likely to form when the air pressure is low. Low air pressure is associated with rising air, which cools and condenses to form clouds. High air pressure is typically associated with sinking air, which inhibits cloud formation.
Do clouds form during high or low pressure system?
Clouds are more likely to form during low pressure systems. As air rises in a low pressure system, it cools and condenses to form clouds and eventually precipitation. In high pressure systems, air sinks and inhibits cloud formation.
Why do clouds form spirals?
They dont usually but if they do the wind.
Is it wet or dry in a low pressure area?
Low pressure areas are typically associated with wet weather because air rises in these areas, cools, and condenses to form clouds and precipitation. This is why low pressure systems are often linked to rainy or stormy conditions.
Do clouds form over low pressure?
Yes they do
Are cumulonimbus clouds low or high pressure?
Low Pressure, A Low Pressure Area allows clouds to form, as a result, you can get a storm from a low pressure area.A High Pressure Area is the exact opposite, it doesn't allow clouds to form, you can get sunny weather from this kind of system.
Why does descending air allow for clouds to form?
High Pressure comes down and the clouds are up.
