how accurate are the predictions for coronal mass ejections-(location, timing and magnitude)?
Old question; I hope you’re still active here…
Basically, we CAN’T predict coronal mass ejections in advance. See http://solar.physics.montana.edu/press/ssu_index.html
Other solar events, such as the number of sunspots, are somewhat predictable—not precisely, but at least have an idea about them. For example, sunspots follow a cycle of approximately 11 years. However, we don’t know before a cycle if it will be strong or not—our models are still too imprecise, though, like you wrote, there has been some advancement, but not much.