Interesting. Is there any info on where the rain activity moved to during that same time frame?
Well, in Africa, the annual Monsoon would cover the North and kept the Sahara area green. Then it stopped, never getting more North than the Southern Sahel. It persists this way to the present.
The Monsoon is still vigorous in South and Southeast Asia, watering India through Vietnam every year. Why hasn’t it returned in Africa?
I didn’t drive my Suburban at all one Spring - we had a very cool Summer ;-)