The first part of this weekend’s snow threat has come and gone with a trace to two inches of snow falling over much of the Philadelphia and New York metropolitan area overnight.  While this system has departed into the Atlantic Ocean, more snow is potentially on the way.

As you can see, a series of low pressure systems are approaching from the west.  These low pressure systems are part of a series of disturbances that will lead to a new coastal low developing along the coastal waters of New Jersey by this afternoon.  This low pressure system will produce an inverted trough that will extend back into the New Jersey coast.

Inverted troughs and the associated precipitation can be, actually typically are, very difficult to forecast for and must be watched by an hour to hour basis.  This afternoon I expect an inverted trough to develop and potentially produce a period of light to moderate snow from Ocean and Monmouth Counties of New Jersey up through Kings, southern Queens, southern Nassau, and southern Suffolk Counties of New York.  This band of snow will be capable of producing an additional 1 to 4 inches of snow on top of the coating to 2 inches of snow that has already fallen.  This forecast is of course very volatile and will have to be monitored hour by hour.

The rest of the forecast area will experience just a few scattered snow showers with temperatures in the upper 20′s to mid 30′s for highs by this afternoon.  Erin will have additional updates later this morning.

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