The high that is lingering along the coast of eastern USA, now
entering Canada:
http://weather.unisys.com/images/sat_sfc_map_loop.html
seems to correspond closely to the behaviour of the low lingering off
the coast of Scandinavia he
http://meteonet.nl/aktueel/brackall.htm

If they don't fill, they must break away to the sound of some
seriously impressive P and S waves.

Apart from their direction, the other common factor with them is that
they are hovering on a massive geological break in the landscape. If I
was an expert I'd call them faults.

Fortunately I am not hampered by peer conditioning.