Global warming is happening now and
its effects are being felt in the United
States and around the world. Among
the expected consequences of global warming
is an increase in the heaviest rain and
snow storms, fueled by increased evaporation
and the ability of a warmer atmosphere
to hold more moisture.
An analysis of more than 80 million daily
precipitation records from across the contiguous
United States reveals that intense
rainstorms and snowstorms have already
become more frequent and more severe.
Extreme downpours are now happening
30 percent more often nationwide than
in 1948. In other words, large rain or
snowstorms that happened once every
12 months, on average, in the middle of
the 20th century now happen every nine
months. Moreover, the largest annual
storms now produce 10 percent more
precipitation, on average.
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