Group 1 - The article discusses the varying perceptions of rainfall despite identical measurements, emphasizing that the impact of rainfall is closely related to its intensity and duration [1][2] - It explains that a rainfall amount of 70 millimeters can have drastically different effects depending on whether it falls in a short period or is spread out over a longer duration, with urban drainage systems playing a critical role in managing excess water [1][3] - The article highlights that regional climate differences affect how rainfall is perceived, with the same amount of rain being considered extreme in one area but normal in another, illustrating the subjective nature of weather events [2][3] Group 2 - The article notes that geographical factors, such as soil type and urban infrastructure, significantly influence the consequences of rainfall, with areas prone to flooding or landslides being particularly vulnerable [3] - It mentions that global warming is expected to increase the frequency and intensity of extreme rainfall events, necessitating adaptive strategies for disaster prevention and mitigation [3]

每次天气有大变化，我们常会收到预警信息。不同颜色的气象灾害预警信号代表什么？如何防范？ 一起听听专家的解答。 新华访谈：什么时候会发预警？ 国家预警信息发布中心副首席杨继国：气象部门发布的气象灾害预警信息一般包括三种，分别是气 象灾害预警、气象灾害预警信号和气象灾害风险预警。 气象灾害预警一般是面向政府及相关部门责任人，起到提示气象灾害风险的作用，时效相对稍长一 些，12至72小时。 新华访谈：不同颜色的预警代表什么？ 杨继国：气象灾害预警信号一般分成蓝、黄、橙、红，四种颜色分别代表不同的气象灾害风险。 蓝、黄、橙、红，由低到高排列，蓝色的叫做4级，它对应的程度是一般；黄色是3级，较重；橙色的是 二级，严重；红色的是一级，特别严重。不管是大风也好，暴雨也好，如果发到了橙色和红色的时候， 就要特别要注意了。 新华访谈：怎么看收到的预警信号？ 杨继国：收到预警信息后，这个时候不要慌。总结起来看，第一，你要看懂是哪一类、哪一级别的 预警信号，针对这些类别和级别再行动。气象灾害预警，我们国家实施的是属地化发布。以北京为例， 如果你在北京，有可能收到的是北京市的预警或预警信号，也有可能收到海淀区的。因为气象灾害预警 是 ...