ATM 103 Lecture Notes - Lecture 18: Silt, Cool Air, West North Central States

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There are many metrics used to define extreme precipitation: 20 year return value: the value expected to be exceeded once every 20 years (so 5% chance to be exceeded in a given year). Daily maximum that is exceeded once every 5 years. Part of the natural behavior of rivers and streams! For example, the nile river in egypt naturally floods every year. Nile flooded every year because of isis tears of sorrow for her dead husband, osiris. In fact the in ancient times was divided into 3 seasons: The egyptian civilization depended on this flooding for their food, and was a significant source of water (and the silt fertilized the land) in a desert region. Infact, egyptian celebrate an annual 2-week holiday (wafaa el-nil) to celebrate the flooding of the nile. A combination of high rainfall rate and very efficient runoff is common to most flash flood events. Lake effect snow events are extreme precipitation events in the frozen form!

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