Blocking high pressure is one of many teleconnections that affect our weather patterns, but what is the Greenland block, and how does it impact our weather in Atlantic Canada? Weather specialist Allister Aalders explains.
Weather model guidance is indicating a blocking high will develop near Greenland towards mid-December, which can have a major influence on weather patterns. -CONTRIBUTED/TROPICAL TIDBITSWhat about? Many forecasters are closely monitoring what’s known as the Greenland block.
The Greenland block is a ridge of high pressure that sits near or over Greenland. The blocking often leads to troughing in the jet stream over eastern North America. It slows or stalls the progression of low-pressure systems trying to exit Atlantic Canada.This blocking pattern is indicated during a negative phase of the North Atlantic Oscillation, or NAO, representing surface sea-level pressure differences between the Azores-Bermuda high and the subpolar low.
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