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17 July 2013
The Amazing Retrograding Low
It developed last Friday over Western Maryland, and brought 10 inches of rain to the coast of Delaware. Then it began to drift westward. This is not that unusual in the summertime, when an easterly wind can develop to the south of a strong upper ridge over North America. The easterly trade-winds form the same way, and steer tropical waves form the coast of Africa to the New World all …