How can it snow so much when it's not freezing?

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How can it snow so much when it's not freezing?
Sources: Meteorologist Steve Zubrick of the National Weather Service in Sterling; NOAA; Weather.gov, Analysis of NOAA/National Weather Service data by Capital Weather Gang's Ian Livingston. The Washington Post. Published on March 5, 2013, 9:29 p.m.
 
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