Table of Contents
Does a Stevenson screen measure rainfall?
The Stevenson Screen or thermometer screen is a standard shelter (from rain, snow and high winds, but also leaves and animals) for meteorological instruments, particularly wet and dry bulb thermometers used to record humidity and air temperature.
What are the features of Stevenson screen?
The Stevenson screen holds instruments that may include thermometers (ordinary, maximum/minimum), a hygrometer, a psychrometer, a dewcell, a barometer and a thermograph. Its purpose is to provide a standardised environment in which to measure temperature, humidity, dewpoint and atmospheric pressure.
Why should an instrument shelter be painted white?
Whatever paint you use, be sure to keep your shelter painted white to prevent excess heat absorption by the wood. Fading paint exposes the wood frame, allowing heat radiation to be absorbed into the shelter unit & causing temperature readings inside the box to be higher than what is actual ambient air temperature.
What are the two main types of precipitation?
The most common types of precipitation are rain, hail, and snow. Rain is precipitation that falls to the surface of the Earth as water droplets.
Who invented Stevenson screen?
engineer Thomas Stevenson
The screen was invented by the Scottish civil engineer Thomas Stevenson (1818–87), the father of Robert Louis Stevenson, the author. It came into use in the late 1860s.
Why is a Stevenson screen double roofed?
As we have seen in order to measure the temperature in an open place in the shadow, the thermometers are kept in the Stevenson screen. The box is made of wood to prevent absorption and conduction of heat. It has a double roof which is insulated to create a bad conductor of heat.
What are the weather elements?
There are six parts of weather: temperature, cloudiness, atmospheric pressure, precipitation, wind, and humidity.
Where should a Stevenson screen be?
The stand of the Stevenson screen should be set in the ground so that the bulbs of the thermometers are at approximately 1.2m (120cm) above the ground.
Where the most weather changes occur?
Most weather happens in the troposphere, the part of Earth’s atmosphere that is closest to the ground.
Why do we place thermometer in shelters that are painted white?
In order to shade thermometers from the sun, special instrument shelters are used to house thermometers, as well as other weather instruments. The shelter is painted white to reflect the sun and has louvered sides so that air circulates through its interior.
Why do thermometers have to be in instrument shelters?
Thermometers should be shielded from the sun, rain, snow and other sources of light, heat, or cold that can cause erroneous readings. If an instrument shelter is used, it should be designed to allow the maximum possible free flow of air while providing protection from heat, precipitation and light.
What are the features of the Stevenson screen?
Prominent features of stevenson screen. A Stevenson screen or instrument shelter is a shelter or an enclosure to shield meteorological instrument against precipitation, and direct heat radiation from outside sources, while still allowing air to circulate freely around them. A Stevenson screen is a prominent feature on most weather stations.
What are the characteristics of Stevenson screen?
It is 1.2 meters above the ground to avoid ground weather conditions from affecting the readings yielded by the housed instruments.
What is It measured in Stevenson screen?
Stevenson screens may also be known as a cotton region shelter, an instrument shelter, a thermometer shelter, a thermoscreen, or a thermometer screen. Its purpose is to provide a standardised environment in which to measure temperature, humidity, dewpoint, and atmospheric pressure . It is white in color to reflect direct solar radiation.
What does the Stevenson screen measure?
Stevenson screens may also be known as a cotton region shelter, an instrument shelter, a thermometer shelter, a thermoscreen or a thermometer screen. Its purpose is to provide a standardised environment in which to measure temperature, humidity, dewpoint and atmospheric pressure.