Clouds and percipitation

Clouds and percipitation - CONDENSATION EVENTS FORMATION...

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CONDENSATION EVENTS: FORMATION & TYPES ** Clouds, Fog, and Dew all have 2 properties in common: 1) They must form from saturated or nearly saturated air RH= 100 % dew point temp -air temp 2) must have a surface for the water to grab on to * dew * clouds & fog ---- -- hygroscopic nuclei: very absorbent condensation nuclei, usually of sulfate and nitrate crystals *** CLOUDS : a form of condensation best described as a dense, visible aggregation of minute droplets of water or tiny crystals of ice. * How do they form? As the air parcel rises it gets to the dew point, thn the water vapor condenses around microscopic particles. A parcel of warm air reaches the point of saturation where the water vapor is changed to liquid water droplets. Either by cooling the air temp to the dp t or by adding water vapor ** Cloud Classification : * 2 criteria for classifying clouds 1) Height of cloud base above the surface. * 3 categories: 1. strato low, up to 2000m 2. alto 2000-6000m 3. cirro 6-13000 2) Degree of vertical development .
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* 2 main categories: 1. stratus : surface-2000 meters, layer horizontal development 2. cumulus : bright and puffy like cotton balls, vertical development * some other common names used -- Cirrus: whispy filaments, 6000-13000 meters, curl of hair, the clouds found in the highest up in the atmosphere and composed of ice crystals Nimbus : “Violent rain” Cumulonimbus (thunderstorms), Nimbostratus= stratus clouds which are producing rain/ snow *** FOG : basically a cloud at ground level , air is saturated Condensation can occur in some instances where RH is as low as 75-80% As the water droplets get bigger they become *** 4 main categories of fog: Radiation fog : produced over land when radiational cooling decreases air T° to the d.p.T° *
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