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• • • • • This article was update on: 2017-02-25 The meteorology is the science that studies the behavior of the phenomena that occur in the atmosphere over time, so that they can foresee its evolution. And all scientific study of the atmosphere means above all collecting accurate weather data. Our senses and especially the sight and touch enable us to estimate a large number of observations. Convert Mb To Kb Software. For example, we can see the amount of clouds in the sky or determine wind direction by the movement of leaves or a column of smoke.

All these observations are called sensory observations. However, our senses are not enough and we have to resort to the meteorological instruments to collect the valuable data. For example, while a person can determine if the air pressure is rising or falling, you cannot know the exact value of it, for which you need to consult an instrument. In this case, the observations are called instrumental observations. D20 Apocalypse Rulebook Pdf.

Some of the instruments can be incorporated in professional or and other are used as separate meteorological devices. Related Articles: • • • Bellow you can find a list of some of the most commonly used tools for tracking atmospheric conditions. Transmissometer Transmisometar measures the degree of attenuation of the light beam at a certain distance (usually it ranges from several meters to 150 meters) as it travels trough water or air. And on this basis the tools makes objective calculation about current viability.

The transmissometer has a light source and a detector at a certain (known) distance. The light emitted form the source is received by the detector and then converted into an electrical voltage proportional to the intensity of the light. The transparency is determined by measuring the proportion of the light that was send form the source and then recorded by the detector. Sometimes the transmissometers are also called telephotometers, transmittance meters, or hazemeters. The transmissometers are used on airports and or stations.

Stevenson screen A Stevenson screen is a box, made of a double layer screens and it is used to shield meteorological instruments when there is precipitation or the instruments are exposed to direct heat radiation from outside sources. This shelter allows free passage of air around the temperature and humidity sensors. Most of the time the Stevenson screens is painted white to reflect the sun’s radiation. The Stevenson Screen is one of a very few designs that is in their aim to provide standardized environment in which to measure weather variables. Stevenson screens are also known as an instrument shelter, cotton region shelter, a thermometer shelter, a thermoscreen or a thermometer screen. The screen was invented in 1864 by Thomas Stevenson.