Weather forecasts are based on weather maps that analyze weather phenomena and meteorological elements at the same time and in different locations. From the ground, high altitude two major categories of two aspects.
From the weather map analysis to know where the cold air, warm air, where the wind and rain, where the weather is fine. Continuously analyze the weather map at different moments, we know the weather system's moving direction and speed, so as to judge the local future by what weather system will be affected, what weather will occur.
The Weather Channel has a whole set of weather systems that analyze atmospheric pressure systems, cloud weather maps, and cloud cyclone maps with better correspondence.
For example, under the control of the continental cold high pressure, the weather is sunny and cold, and more northerly winds. Controlled by the subtropical high pressure, the weather is hot and sunny, more southerly winds. Or cold and warm air convergence zone called fronts, affected by the fronts, the weather suddenly changed to rainy weather. Controlled by low pressure, the weather is cloudy and rainy. These are the basis for the accuracy of weather forecasts.
With the wide application of remote sensing, computational technology and meteorological satellite data, weather forecasting has taken a new leap forward, and the traditional weather map has been replaced by numerical weather prediction. The so-called numerical weather prediction applies seven hydrodynamic and thermodynamic differential agendas to describe the laws of atmospheric motion, maximum temperature, minimum temperature, precipitation, humidity, barometric pressure, wind direction, wind speed, and obtains spatial and temporal analyses of multiple unknowns in the future, i.e., the distribution of the future weather, through a large-scale, high-speed computer that solves the system of equations.
The Weather Service is responsible for receiving forecast information issued by the National Center, editing and revising it with the latest local meteorological information and forecasters' experience to make local weather forecasts.
The Weather Service Station, through a series of scientific computational simulations and technical analysis, comes up with a more accurate weather run chart to ensure the correctness of the forecast.