The coldest air of the season will be pouring into the Mid-Atlantic on Monday with the heart of the coldest air passing overhead Monday night through Tuesday. Highs on Monday and Tuesday will likely hold in the 30s across the northern and western suburbs with most locations holding near freezing for a high on Tuesday (DC and the southern and eastern suburbs may make it into the middle to upper 30s)
Everyone wants to know when are we going to receive our first snowfall of the season? As I had said during my winter forecast, December was expected to be mild with the snow coming during the second half of winter. The good news is that the teleconnection indices are all trending in the right direction with the NAO (North Atlantic Oscillation) and AO (Arctic Oscillation) both going negative. A negative NAO index favors big east coast snowstorms and a negative AO favors very cold air pouring into the United States. There are other indices that are favoring a patten including the MJO, but for the sake of keeping things brief, let’s take a look at the CFS (Climate Forecast System) Ensembles for snowfall between now and January 15th and now and February 15th. As you can see, the models are suggesting that some hefty snow pack will be on the ground as we head into the latter half of Winter!