| While cloud condensation nuclei are always readily available in the atmosphere, ice nuclei are often scarce. |
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| The combination of the moisture pumped out by these mills and the condensation nuclei provided ensure that low cloud and fog is a real problem. |
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| Deposition nuclei are analogous to condensation nuclei in that water vapour directly deposits as ice crystals on the aerosol. |
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| In tropical maritime air masses, the number of condensation nuclei is often very large. |
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| All three of these contribute condensation nuclei to the atmosphere and enhance the development of low cloud, especially in the fall and winter. |
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| It is created when the air temperature and the dew point of the air are nearly equal and sufficient condensation nuclei are present. |
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| These act as condensation nuclei around which even more water vapour in the surrounding air condenses. |
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| The forming of such clouds requires something for the vapour to cling to, the so-called condensation nuclei. |
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| If condensation nuclei are absent, the dew point may be exceeded by the cooling air, and the water vapour becomes supersaturated. |
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| This allows for frequent low level inversions which does lead to the occasional period of ice fog fed by condensation nuclei from local industry. |
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| The condensation nuclei from these can contribute to stratus development and lower ceilings if the flow is from the southeast. |
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| Sulfate aerosols act as cloud condensation nuclei and thus lead to clouds that have more and smaller cloud droplets. |
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| In the atmosphere, however, there is an abundant supply of aerosols, which serve as nuclei, called condensation nuclei, on which water vapour may condense. |
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| Such city-generated or city-modified weather factors as wind turbulence, thermal convection, and high concentrations of condensation nuclei might be expected to increase precipitation. |
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| Williams says minute ash particles will serve as cloud condensation nuclei and ice nuclei and that the larger particles will undergo a process called riming, in which they aggregate and become coated with ice. |
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| If an abundance of condensation nuclei is present in the atmosphere, radiation fog may develop before the temperature-dewpoint spread reaches zero. |
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| From June of 1995, five more stations were added to give greater geographical coverage of continuous measurements of bulk aerosol chemical composition and condensation nuclei. |
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| That is important because clouds do not generally form very well, they don't form in a vacuum, they form around condensation nuclei and they don't like neutral particles so well as ions. |
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| There are also the pulp mill, 5 miles west of town and the Cominco Smelter, 10 miles south at Trail, which add condensation nuclei, aggravating the fog and low cloud problems in and around Castlegar. |
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| However, with a pulp-and-paper plant along the Columbia River to the northwest and a large smelter operation in Trail to the south, the additional moisture and condensation nuclei make low ceilings a persistent problem. |
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| Water vapour normally begins to condense on condensation nuclei such as dust, ice, and salt in order to form clouds. |
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| Like other precipitation, hail forms in storm clouds when supercooled water droplets freeze on contact with condensation nuclei, such as dust or dirt. |
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