Wiki 相对湿度（relative humidity）是指单位体积空气中，实际水蒸气的分压与相同温度和体积下水饱和蒸气压的百分比。也就是绝对湿度与最高湿度之间的比，它的值显示水蒸气的饱和度有多高。在当前的气温之下，空气里的水分含量达至饱和，相对湿度就是100%。空气中相对湿度超过100%时，水蒸气一般会凝结出来。随着温度的增高空气中可以含的水就越多，也就是说，在同样多的水蒸气的情况下温度降低相对湿度就会升高。因此在提供相对湿度的同时也必须提供温度的数据。通过最高湿度和温度也可以计算出露点。
100~250mm降水量是指？mm/6h。
小雨：<5mm/12h or <10mm/24h；
中雨：5~15mm/12h or 10~25mm/24h；
大雨：15~30mm/12h or 25~50mm/24h；
暴雨：30~70mm/12h or 50~100mm/24h；
大暴雨：70~140mm/12h or 100~250mm/24h；
特大暴雨：>140mm/12h or >250mm/24h。
http://www.bbc.com/news/world-latin-america-37549219 Hurricane Matthew: Dangerous storm closes in on Haiti
Category one: sustained winds of 74-95mph (119-153 km/h); some damage and power cuts
Category two: winds of 96-110mph (154-177 km/h); extensive damage
Category three: winds of 111-129mph (178-208 km/h); well-built homes suffer major damage
Category four: winds of 130-156mph (209-251 km/h); severe damage to well-built homes, most trees snapped or uprooted
Category five: winds of 157 mph (252 km/h) or higher; high percentage of homes destroyed, area uninhabitable for weeks or months
Source: NOAA
https://www.bbc.co.uk/programmes/p02tv3s1 Four things we need to know about science - Brian Cox There are four key points everyone should understand about science, according to Prof Brian Cox: That the Universe began in a Big Bang; that everything is made of atoms; that we share a common ancestor (Darwin’s Theory of Evolution); and the theory of gravity. "There are four fundamental forces of nature, of which gravity is the most obvious but the weakest," said the particle physicist. We should all understand the cultural significance of science as an integral part of everyday life, added Prof Cox, who teaches at the School of Physics and Astronomy at the University of Manchester. The fact we know that the universe began in a Big Bang 13.82 billion years ago, or that we’ve measured the age of the Earth (4.54bn years), are "culturally important statements”, he added. "We know the story of the origin and evolution of the universe and the origin and evolution of life on Earth," said Prof Cox. Prof Cox started by explaining why it is important that we understand this "culturally important information".
