There always seems to be an hiatus in the middle of most spells. Sometimes it is so radical the next spell comes in at that time. Sometimes the old weather returns. …
The norther cyclones are five and six days long. They can be intense but since they are at their worst when the leaves are stripped bare, little damage ocurs. Houses here are built to withstand them. In warmer climes is is cheaper and safer to build thin and light and rebuild every so many years when your house is blown away.
That takes the concerted effort of the tribe or village and doesn't allow for insurrection and crime which has always been common in the northern hemisphere but was unknown in the tropics before we civilised them.
There is a series of severe Lows blowing across the North Pacific at the moment. Here is an example:
It goes ashore at British Colombia, Washington or Oregon and crosses to Newfoundland; one way or another. I don't know what the big deal with the upper atmosphere is.
Meanwhile on the Unisys North America chart it looks like that region of green is starting again.
To be honest, I don't really know exactly what the green is supposed to represent.