A couple of teleconnection indices that provide information on the North Atlantic and Arctic region are forecasted to move into “negative” territory during the next few days and this often is correlated with cold air outbreaks from Canada that make their way into the central and eastern US. Indeed, a “negative” North Atlantic Oscillation (NAO) and its closely-related cousin, the Arctic Oscillation (AO), will slide into “negative” territory as we head towards the end of April and will stay there into early May. With such a pattern, high-latitude blocking will develop across places like Greenland and northeastern Canada and this, in turn, leads to a more favorable wind flow pattern in the upper atmosphere that can lead to outbreaks of cold air from northern Canada into the eastern half of the nation.
The next shot of colder-than-normal air will likely arrive in the Mid-Atlantic region around Tuesday night of next week and the next couple of days will likely again feature temperatures well below normal for this time of year. After experiencing temperatures potentially at 80+ degrees on Sunday, the Mid-Atlantic region may feature highs confined to the 50’s by the time we get to the middle of next week. Unfortunately, those colder-than-normal conditions are likely to stick around for much of the second half of next week and could very well extend right into the first week of May. Bottom line…enjoy the next few days which will be quite decent and mild.
Meteorologist Paul Dorian
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