What's the difference between barometer and thermometer in observing weather?

Barometers are more accurate than thermometers. Because the trend of air pressure indicates the direction of storm movement. Absolute pressure is somewhat deceptive, especially for observers living at high latitudes. The global pressure map is compiled after careful measurement by barometer, which shows that the pressure is relatively average in both special altitude areas and sea level areas to achieve consistency. Although some amateur observers use weather barometers, which are characterized by electronic sensors and digital readings, most people prefer to use a standard empty box barometer because it has a vacuum metal chamber with a spring opposite it.

The change of internal space temperature is related to the change of external air pressure and is transmitted to the needle control panel through the lever system. Most meteorological observers prefer empirical accuracy, which can be accurate to 1 "inch" pressure. Or a tenth of a millibar, or even a tenth of a degree. The scope of reading is equally important. Observers living in cold areas are satisfied with the temperature control panel that can't reach-29 F. Meteorological observers don't want to ignore the most important aspects of the weather, namely precipitation and wind. There are several standard measurement methods for rainwater. But the most popular one is the quantity of a sharp bucket (standard quantity), which can be emptied automatically every once in a while, so it can measure rainfall without being full. However, rain, like temperature, is difficult to measure. Because the wind makes the rainfall reaching the top of the bucket inaccurate. Most surveyors try to put the instrument in a relatively open and low position. Similarly, barometers (whether electronic sensors or traditional cup-shaped shafts) will not give accurate wind readings if they are placed near buildings or trees. The standard anemometer must be placed at a height of 35 feet (10 meter).

Observers in the north often boast about the large amount of snow, but the technology there is the highest. A suitable snow detector needs a flat plate, which will regularly clean the snow that melts due to weight or ends in heavy snow. On the other hand, some observers are eager to get the record of snowfall, so the results are often high and unreasonable. For this reason, it is best to clean the dishes every 6 hours.

Although it is not as charming as snow, humidity plays an important role in meteorology. Meteorologists used to measure the length of human hair with a hygrometer. Later, observers used hand-cranked hygrometers to do this. There are two thermometers on each side of this instrument, and part of a ball is wrapped in gauze. The observer wets the gauze, turns the thermometer for a few minutes, evaporates and cools the ball to a temperature called wet ball. The temperature difference between the dry bulb thermometer and the wet bulb thermometer can be a measure of atmospheric humidity. At present, electronic sensors for measuring humidity already exist, but they are not very accurate.

Puritans like to use rotating hygrometers, but the dynamic waves of electronic weather stations are compatible with home computers. Some of them appear continuously, and the data provided directly enter the computer, together with software, enabling observers to modernize their weather diaries recorded in words.

Meteorological observers like to compare notes made during observation, and some people find that international network organizations want to mail their data; Others want to take the initiative to observe for the National Weather Service. If the weather above the horizon permits, American observers will become storm trackers in the sky. SKYWARN is a voluntary organization that assists the NWSFO of the National Weather Service.