An Omega block will be the bringer of good weather for some in Canada this weekend, and the bearer of unpleasant conditions for others.

In a nutshell, an Omega block is nature’s version of a traffic jam. The classic setup occurs when a ridge of high pressure finds itself stuck between two lows--with troughs on each side of it.

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[Upper-level pattern/Omega block developing this week] Upper-level pattern/Omega block developing this week

Here's what that means for Canada's weather this weekend.

NATURE'S TRAFFIC JAM IN MOTION

A blocking pattern in the upper levels of the atmosphere is similar to a traffic jam on a highway.

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