Is the weather forecast percentage regional or probabilistic?

The percentage of weather forecast is probabilistic.

For example, if it rains or snows, the percentage number next to the raindrop or snowflake icon represents the probability of rain or snowfall. For example, for the prediction of precipitation, the traditional weather forecast generally predicts whether it will rain or not, while the probability weather forecast gives the percentage of possible precipitation. The greater the percentage, the greater the possibility of precipitation.

Forecasters predict the percentage of precipitation opportunities in a certain area and a certain period of time through sorting, analysis, judgment and discussion based on various meteorological data. This is only the "probability" of forecasting precipitation, and it cannot be guaranteed to be 100%. If the probability of precipitation forecast is 60%, when arranging activities, it is mainly rainy, supplemented by no rain; The probability of forecasting precipitation is 80%, so be prepared for rain. There is no such percentage in sunny or cloudy days, and the probabilistic weather forecast reflects the certainty of weather changes.

Common sense of weather forecast:

When listening to the weather forecast, we often hear time terms such as "today's day" and "tonight", and meteorological terms such as "cloudy", "cloudy" and "sunny". "Today's daytime" refers to 12 hours from 8 am to 20 pm; "Tonight" means 12 hours from 20: 00 to 8: 00 the next morning. "Clear" means that the cloud cover accounts for10-30%; "Cloudy" means that the amount of clouds accounts for 40-70%; "Yin" means that the cloud cover accounts for 80- 100%.

Meteorological units have two standards for precipitation: 12 hours and 24 hours. /kloc-the standard of 0/2 hour precipitation level is "light rain", that is, the precipitation is 0.6-5 mm; The "moderate rain" precipitation is 5.1-15 mm; "rainstorm"15.1-30 mm; "Rainstorm" is 30.1-70mm; The rainstorm is 70. 1-200mm. The standard of 24-hour precipitation level is: "light rain" precipitation means1-10mm; The precipitation of "moderate rain" means10.1-25mm.