Starting with massive continental wide snow blitzes
Morphing into a full glacial period
It is likely that the present trend towards another grand solar minimum will indeed bring on another “little ice age which itself morphs into a full glacial period.
There is a school of thought that the Sun is going into a hibernation mode. For me, the hibernation theory gives the best and only explanation as to how snow can survive in summer in the mid-latitudes; the Sun today is far too hot to allow snow to subsist in summer except in the mountains of the Arctic and on the Greenland and Antarctic ice sheets. I have seen suggestions that a sudden hibernation mode would reduce the temperature of the Sun’s surface from 5 500 C to around 4 000 C, a massive drop of nearly 25% in heat output.
In addition the Earth is undergoing a Magnetic Reversal today which was not happening during the last “little ice age”. The resultant massive increase in cosmic rays, together with the memory of the still interglacial warm oceans, could give the new Ice Age a powerful start with massive continental wide snow blitzes which would be harder to generate when the oceans descend to ice age levels.