Core Points - Recent extreme rainfall in the Beijing-Tianjin-Hebei region has led to high-level weather warnings issued by meteorological departments [1] - Rain intensity, defined as the amount of rainfall in a specific time frame, differs from the concept of heavy rain, which refers to total accumulated rainfall over a longer period [3] - The hourly rainfall in Fangshan, Beijing reached an extreme level of 68.5 mm, with 13 weather stations in the area setting historical records during this event [5] - Understanding rain intensity is crucial, as an hour of 70 mm rainfall equates to 70 liters of water per square meter, leading to rapid flooding in urban areas and potential geological disasters in mountainous regions [7] - High-level rain warnings, especially red alerts, indicate significant risks, urging the public to avoid dangerous areas and ensure personal safety [9]

Group 1 - The article discusses the concept of rain intensity and how to interpret weather warning information [1]