The Ice Accretion Indicator is an L-shaped piece of aluminium 38 cm (14.96 in) long by 5 cm (1.97 in) wide. It used to indicate to formation of ice, frost or the presence of freezing rain or freezing drizzle. General Name, Symbol, Number aluminium, Al, 13 Chemical series poor metals Group, Period, Block 13, 3, p Appearance silvery Atomic mass 26. ... A natural, 4 tonne, block of ice on a beach in Iceland Icicles Ice is the solid form of water. ... Blades of grass coated in frost. ... A shrub coated by glaze after a night of freezing rain. ...
It is normally attached to a Stevenson screen but may be mounted in other areas away from any artificial heat sources. The weather station would have two on site and they would be exchanged after every weather observation. The spare indicator should always be at the outside air temperature to ensure that it is ready for use. A Stevenson screen is a meteorological screen to shield instruments against precipitation and direct heat radiation from outside sources, while still allowing air to circulate freely around them. ... A technician checks data from a weather station. ... Composite satellite image showing the progress of a hurricane weather system approaching the east coast of America Weather comprises all the various phenomena that occur in the atmosphere of a planet. ...
If the observer notes the presence of ice or frost on the indicator then a remark to that effect should be sent in the next weather observation. Examples of these are 'Rime Icing on Indicator' and 'FROIN' (Frost on Indicator). As the indicator is at air temperature and is kept horizontal it provides an excellent surface on which to observe freezing precipitation. The word rime has several meanings in English: For various forms of frost, see rime (frost). ...
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