|Map showing general path of an Alberta Clipper|
|48-hour snowfall ending the morning of January 22, 2014.|
There have been several of these Alberta Clippers over the past week or more. The upper level disturbances produce these clippers have been favored by the strong, persistent upper level trough over the eastern U.S. coupled with the ridge in the eastern Pacific.
Here is the 500 millibar map (~18,000 ft) from this morning with three "short waves" marked. Below that is the surface weather map from this afternoon at 1:00 p.m. EST. The disturbance just off the east coast is associated with the storm that left up to a foot of snow in New York and New Jersey today. The wave over the northern U.S. is associated with the low and cold front moving through the Northern Plains and Midwest today. Further northwest there is yet another wave moving over the top of the ridge that could produce another clipper in a couple of days.
|Surface map for 1:00 p.m. EST 1/22/2014|
This animation of the 12:noon CST weather map for the past ten days shows the progression of the Alberta Clippers across the eastern half of the U.S. along the same general path.
|Surface weather maps for 12:00 CST January 12-22, 2014|
The path of the clippers is also seen in the snowfall pattern over the eastern U.S. the past ten days.
It appears the current upper air pattern will remain in place for the next week to 10 days, so winter weather will continue to affect the Northern Plains, Midwest and east.