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Thursday, October 24, 2024

The four horsemen of Toronto weather

 Our weather is mucky right now, so I thought I'd go into the basics for a minute.  My AI scraping is starting to calm down again, but I can still try to confuse the darn things.

We have three main horsemen for the weather.  My favourite this time of year is the Arctic outbreak.  This comes in two forms.  We have been hit a lot this year by the Arctic Blob.  This is a true 'air glacier' in that it takes up the entire atmosphere from bottom to top, and has its own physical properties, like a true object.  It comes down with kinetic energy and momentum, and sweeps all the stagnant air away.

If there is moist air around, like a few times this summer, then it produces the worst storms and rainfalls.  Just think of our floods this year.  it has nothing to do with heat, and clange, but everything to do with the impact of this cold air.

The second form of cold air is the 'Alberta Clipper'.  It's when there is a big tropical plume hitting the Yukon and dragging down cold air.  This cold air is not a glacier, but a cold knife hugging the land.  It comes in clear, and the rain comes afterwards from the Pacific air.

The Pacific air is Horseman #2.  It used to come a lot, but is now quite rare, due to the lack of heat energy on the Pacific equatorial belt.

Our major warmth comes from the South, as Horseman #3.  If it lingers over Toronto, we get incredible soggy, humid heatwaves that can last for weeks.  Haven't had those in the last few years.

We've now had two episodes of Horseman #4, the winds from the East.  They are very rare, and I wouldn't even mention them, except this might be a new pattern.  We have a lovely stagnant pocket of warm clear air.  I loved September at the cottage this year.

I am expecting nothing but Arctic blobs this winter.  If all goes according to plan, then we'll hit 30 below in Toronto, and the lakes will freeze, at least Huron and Erie.  Of course, like last year, there are always things to disrupt the major forces.


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