I would like to ask how to understand the temperature by looking at the weather forecast, such as 8℃-5℃, -8℃-3℃ and 5℃-9℃.
Take the following figure as an example:
According to the weather forecast in Changsha, the lowest temperature (before sunrise, it is generally observed at 2 am) 13 degrees Celsius, and the highest temperature (at 14- 14, it is generally observed at 14) 2 1 degrees Celsius (this is the predicted value). Now the real-time observed temperature is
Air temperature, air temperature. China is expressed in degrees Celsius.
In meteorology, the physical quantity representing the degree of air heat and cold is called temperature, which is referred to as temperature for short. The international standard unit for temperature measurement is Celsius (℃).
The temperature mentioned in the weather forecast refers to the air temperature measured in the open air without direct sunlight (usually measured by blinds). The highest temperature is the highest temperature in a day, generally appearing in14-15; The lowest temperature is the lowest temperature in a day, usually before sunrise. China uses centigrade scale, which is expressed in degrees Celsius. Generally, it is observed four times a day, at 02: 08: 00,/kloc-0: 4: 00 and 20: 00: 00 respectively. According to the actual situation, some stations observe three times a day, at 08: 00, 14 and 20: 00 respectively.
Supplementary knowledge: the process of weather forecast:
The first step-meteorological observation?
At present, China has initially established a three-dimensional meteorological observation system combining space-based, ground-based and space-based. Space-based observation is mainly done by satellites, and space-based observation is mainly done by sounding balloons and sounding rockets; Ground observation is completed by land and ocean observation stations. The national meteorological department has 2423 national ground meteorological observation stations, 473 national unmanned automatic weather stations, 55488 regional automatic weather stations, a new generation of weather radar stations 18 1, and 7 meteorological satellites in orbit. Observers all over the country will regularly observe clouds, sky conditions, temperature, humidity, air pressure and wind power. And observe the real-time situation of the atmosphere.
Step 2- Collect data
The observation data are quickly transmitted and collected through professional communication networks, and processed by high-speed computers to obtain special charts reflecting the national weather situation-weather charts and other charts for weather forecasters to analyze and use.
The third step-data analysis
Forecasters make detailed weather forecasts for different time periods in the future by analyzing weather maps, studying various weather maps and combining meteorological satellite and radar detection data.
The fourth step-forecast consultation
The national-provincial-municipal meteorological observatory conducts two-way video communication and consultation through the special network system, and forecasts the future weather according to the weather map and radar map. Because there are many and complicated reasons that affect the weather, forecasters need to brainstorm and discuss together. After summarizing the forecast opinions, the forecaster of the main shift makes a final forecast conclusion on the future weather development and change through comprehensive analysis.
Step 5- Forecast Release
After reaching a conclusion through consultation, the weather forecast will be made into different forms of products and disseminated through radio, television, newspapers and the Internet.