Elliott just shared some thoughts - I'd say he picked some nice dates for his timeframe:
(1/4) Mother Nature's version of #MarchMadness in the eastern U.S. begins today. A big pattern change.. featuring a pronounced west-based -NAO (Jet Stream blocking centered southwest of Greenland) and a progression toward western US ridging.. is underway..
(2/4) .. and will reach maturity between March 10-20. The high-latitude blocking suppresses the Jet Stream farther south into the mid-latitudes, and the subtle ridge in the West forces storm systems to track underneath the block instead of cutting into the Great Lakes..
(3/4) Add to this a highly-amplified Madden-Julian Oscillation (MJO) wave running wild through phases 8 and 1, and we have a recipe for below-normal temps and at least a couple opportunities for snow in southeastern PA and northern MD over the next two weeks..
(4/4) With that being said, snow-lovers need to root for the upper-level low responsible for the Fri/Sat storm to track farther south. If it doesn't, we'll have a "nuisance" event with a rain/snow mix and 1-3 inch snowfall amounts (at best) on grass..