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Follow us on Facebook. Follow us on YouTube. Disclaimer Information Quality Help Glossary. Now, in the spring, if the air temperature was 70 and the dewpoint was 70, what would the relative humidity be? In which situation would if feel more humid? What does this tell you about relative humidity? Answer to Question 1. QUESTION 2: If the air temperature was 95 F with a dewpoint of 70, would the air's relative humidity be higher or lower than if the air temperature was 70 degrees with a dewpoint of 55?
Which air mass would feel more uncomfortable to you? Answer to Question 2. The amount water moisture that air can hold depends on factors including air temperature , air pressure , and the amount and kinds of particulate matter dispersed in the air see cloud condensing nuclei [CCNs] discussed below.
For example, warm, humid air near sea level may be clear clear during warm daylight hours, but as the air temperature drops at night the relative humidity will increase until it reaches the dew point and f og begins to form.
Fog is a thick cloud of tiny water droplets suspended in the atmosphere at or near the earth's surface restricting visibility Figure 8. As the air continues to cool, the condensing droplets water form mist. When the mist droplets grow large enough to be influenced by gravity, it will fall as precipitation.
The dew point is called the frost point when the temperature is below the temperature that water freezes. Below freezing, water moisture in the air will sublimate directly into ice, forming frost, snow, or hail Figure 8. A hygrometer is a device that can measure the humidity in the air. There are many kinds of hygrometers and different ways to measure humidity in the air. To confuse things more, the weight depends on how you define it:.
We're only going to look at the weight of the actual cloud particles. A 1 km 3 cloud contains 1 billion cubic meters. Doing the math: 1,,, x 0. That is about , kilograms or 1. But, that "heavy" cloud is floating over your head because the air below it is even heavier— the lesser density of the cloud allows it to float on the dryer and more-dense air. Source: Gleick, P. In Encyclopedia of Climate and Weather, ed.
The little cloud that could—but why? Why is this tiny cloud the only one in the sky? Earth's water is always in movement, and the natural water cycle, also known as the hydrologic cycle, describes the continuous movement of water on, above, and below the surface of the Earth. Water is always changing states between liquid, vapor, and ice, with these processes happening in the blink of an eye and over millions of years. The air is full of water, even if you can't see it.
Higher in the sky where it is colder than at the land surface, invisible water vapor condenses into tiny liquid water droplets—clouds. When the cloud droplets combine to form heavier cloud drops which can no longer "float" in the surrounding air, it can start to rain, snow, and hail What is streamflow?
How do streams get their water? To learn about streamflow and its role in the water cycle, continue reading. Perhaps you've never seen snow. Or, perhaps you built a snowman this very afternoon and perhaps you saw your snowman begin to melt. Regardless of your experience with snow and associated snowmelt, runoff from snowmelt is a major component of the global movement of water, possibly even if you live where it never snows.
The air is full of water, as water vapor, even if you can't see it. The sun and moon can usually be seen shining through these clouds. Middle Level Clouds. They can be associated with light precipitation. Characteristics: Low clouds are mostly made up of water droplets.
Some low-level clouds can develop into multi-level clouds. Nimbostratus clouds are very dark gray and blot out sunlight. They usually produce heavy rainfall. Other types of clouds. There are a variety of clouds which are not classified as high, mid or low level cloud. These include:. Usually they are fairly restricted in height, but can sometimes extend upwards to much higher altitudes when they become known as cumulonimbus clouds.
These are very large and can extend to metres or higher. At base level, the cloud is made up of water droplets but the top of the cloud is made up of ice crystals.
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