EESB03H3 Chapter Notes - Chapter 5: Cumulus Congestus Cloud, Cirrocumulus Cloud, Altostratus Cloud
24 Jan 2017
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O(cid:374) (cid:272)lear, (cid:272)al(cid:373) (cid:374)ights, o(cid:271)je(cid:272)ts (cid:374)ear the earth(cid:859)s surfa(cid:272)e (cid:272)ool rapidl(cid:455) (cid:271)(cid:455) e(cid:373)itti(cid:374)g i radiatio(cid:374). The ground and the objects near it become much cooler than the air surrounding it. Eventually this air can cool to its dew point temperature and saturation occurs. When the dew point temperatures are above freezing, the water vapor that condenses forms tiny visible specks of water called dew. If the air temperature drops to freezing or below, the dew will freeze, becoming tiny bits of frozen ice called frozen dew. When the dew points are below freezing (frost point), the water vapor will form into ice crystals and create frost. The coolest air on a clear, calm night is usually at ground level, and dew is more likely to form on blades of grass than on objects several meters above the surface. Dew is more likely to form on clear, calm nights than on cloudy or windy nights.
