If you are a kid and are dreaming of a sled-worthy snowfall, a skier hoping for some fresh powder, or would just like to see something other than ice, cold rain, or very light snowfalls … the pattern in the upper atmosphere may finally be moving in your favor next week.
The jet stream patterns across North America are directly impacted by the North Atlantic Oscillation (NAO), Pacific North American (PNA) ridge and Arctic Oscillation (AO). These three indexes are all currently trending in a direction that favors a ridge over the west coast & a trough in the east (positive PNA) blocking over the North Atlantic (negative NAO) and cold air moving south out of Canada (negative AO).
If the NAO index drops to a negative one, this will be the lowest this index has been so far this winter and is indicative of more pronounced blocking over the North Atlantic/Greenland/Eastern Canada. This blocking allows storm systems that form along the east coast to slowly move along the coast instead of quickly moving out to sea.
*The forecast models are now hinting that a storm may form off of the Mid-Atlantic coast during the middle portion of next week. This upper level pattern bares watching and I will post updates if necessary as the forecast models iron out a track*