Greenland Block

850Record warmth is forecast for parts of ice-covered Greenland this week and next. Parts of Newfoundland and Nova Scotia will see temperatures in the 40s and 50s this week which is some 20-30 degrees above average! The map to the left shows the departure from normal temperatures across North America.

So, why are places to the south colder than locations to the north? Seems counter-intuitive doesn’t it? The reason is the presence of a “Greenland Block.”  A ridge of high pressure has been developing over Greenland the past week or so. This ridge of high pressure is pulling very warm air northward from the Gulf Stream into the Canadian Maritimes and Greenland. The jetstream has become so highly amplified that cold air is actually undercutting the warm air to the north. The technical jargon for this type of scenario is a negative phase of the North American Oscillation.

156340_10150133710524167_639419166_7846171_4399136_nThe bottom line with this type of pattern is colder than normal temperatures for the Northeastern and Great Lakes regions of the United States. Consequently, warmer than normal air will now work northward through the Rockies. As far as precipitation, this pattern does not allow for much! In fact, it is more than likely that most systems will be “clipper-type” systems that work from Alberta and Saskatchewan down into the Midwest. Each clipper system has the opportunity to bring a new chunk of cold air as well.

naoHow long will this pattern last? It’s really hard to say. However it appears from the models that this could be the middle of it…with a return to a neutral pattern by Christmas so get out the heavy jackets, scarves, and gloves!

p.s. We have added a new tag called #weathergeek that will be used for our more technical blog posts. Don’t forget you can search our blog for these tags by using the tag list on the bottom of the side-bar. -ES

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Posted under climate/climate change, weather geek

This post was written by qni_it on November 30, 2010

5 Comments so far

  1. bub November 30, 2010 5:13 PM

    Sprinkle a decent bit of precip in there and I would be stoked.

  2. WI Weather Buff November 30, 2010 7:59 PM

    I love the new weather geek tag!

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  1. Greenland Block still here! December 21, 2010 10:37 PM

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