Observation Point: The point from which an observation is taken.
Observation Station: The point from which an observation is taken.
Obscuration: The amount of sky that is hidden by snow, rain, fog, dust, haze, etc.
UNDERCAST In aviation, it is an opaque cloud layer viewed from an observation point above the layer. From the ground, it would be considered an overcast. UNITED STATES WEATHER BUREAU The official name of the National Weather Service prior to 1970.
The distance between two objects, usually an observation point and an object under observation. See slant range. 3. A maximum distance attributable to some process, as in visual range or the range of an aircraft. 4.
fog day"A day when fog is observed at an observation point.
fog deposit"The formation of an ice coating when fog contacts exposed surfaces that are at temperatures below freezing.
Apart from weather conditions, AMeDAS is also used in the observation of natural disasters. Temporary observation points are set up in areas where there are signs of volcanic eruptions or earthquakes.
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undercast—A cloud layer of ten-tenths (1.0) coverage (to the nearest tenth) as viewed from an observation point above the layer.
unlimited ceiling—A clear sky or a sky cover that does not meet the criteria for a ceiling.
and does not properly register the maximum value. When this occurs the maximum temperature for the day is consistently registered too low and climatologists have to correct for such data by using temperature values from a nearby observation point.
 See also: Surface, Weather, Air, Observation, Water
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