A nor'easter storm is bringing heavy rains and snow to many parts of the Northeast U.S. The system developed as a large front moved across the U.S. on Friday, combining with a smaller convective system off the coast of Florida. As this system moved north, it intensified and drew in cold air from the Great Lakes region. Lake--effect snows of up to 12-18 inches have fallen in the higher elevations of West Virginia through New York. Winter storm warnings have been issued by the National Weather Service for these areas. This time-lapse animation uses infrared imagery from the NOAA GOES-13 satellite to track the storms' movement from April 20-23, 2012. Nor'easters are most commonly associated with winter storms, but can occur at any time of the year.

credit: NOAA

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