ATMO 201 Lecture Notes - Lecture 4: Nimbostratus Cloud, Advection, Cumulus Congestus Cloud
5 Oct 2015
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Dew: tiny specks of water that form on things because they have gotten colder than the dew point temperature. When dew is on the grass,/ rain will never come to pass. / when grass is dry at morning light,/ look for rain before the night. Frost: the delicate, white crystals that form in this manner. In dry places, the air can become very cold but won"t reach the frost point, so there is not frost: freeze and black frost are words denoting this situation can severely damage certain crops. Some particles are hydroscopic, so water can attach to them even if the relative humidity is well below 100: this particles get bigger and scatter light haze. As rh increases, particles get bigger and become more visible. When visibility lowers to less than 1km and air is filled with million of these particles, haze cloud resting near ground (fog)
