Dew Point Dew point is the temperature to which a parcel of air would need to be cooled to reach saturation.
How do I measure humidity? Instrument: Hygrometer Psychrometer : a type of hygrometer consisting of two identical thermometers mounted side by side Dry bulb: give the present air temperature Wet bulb: has thin wet wick tied around the end
Cloud Formation Clouds form when air is cooled to its dew point
Clouds Clouds are classified on the basis of their form and height.
Three Types of Clouds Cirrus (cirrus = curl of hair) high, white, and thin Cumulus (cumulus = a pile) rounded individual cloud masses that have a flat base and the appearance of rising domes or towers Stratus (stratus = a layer) best described as sheets or layers that cover much or all of the sky
Classification of Clouds by Height High Clouds Have bases above 6000 meters Cirrus: high, white and thin Cirrostratus: flat layers Cirrocumulus: fluffy masses
Middle Clouds (Alto) Have bases between 2000 and 6000 meters Altocumulus: rounded masses that are larger and denser than cirrocumulus clouds Altostratus: uniform white to grayish sheet covering the sky with the sun or moon visible as a bright spot
Low Clouds Have bases below 2000 meters Stratus: uniform layer of clouds that covers much of the sky Stratocumulus: scalloped bottom that appears as long parallel rolls or broken rounded patches Nimbostratus: grayish clouds covering most of the sky often producing precipitation Cumulonimbus: cloud covering all three height producing thunderstorms
Fog A cloud with its base at or very near the ground.
How Does Precipitation Form? For precipitation to form, cloud droplets must grow in volume by roughly one million times.