We've seen a lot of predictions of extreme weather and natural disasters, usually connected to climate change and usually stated in general terms. We're often told that we can expect more extreme events, increased temperature and rainfall extremes, etc.

But in the last few days I've run across a couple predictions about very specific events that, if they turn out to be accurate, will result in many hundreds of thousands of deaths, and possibly relatively soon meaning in the next few decades.

The first one is a prediction that there will be another massive earthquake and tsunami in Indonesia that will be even larger than the one years ago.

Scientist who predicted Boxing Day tsunami says another disaster is coming

The data and observations this scientist has gathered to make the prediction is convincing. The video includes some obvious signs of the pressure that is quickly building up. Fascinating video.

Another prediction is for a massive flood to hit the central valley of California, which includes the capital, Sacramento, many other large cities, and the breadbasket (or fruit basket) of America.

A disastrous megaflood is coming to California, experts say, and it could be the most expensive natural disaster in history

Climate change is increasing the risk of a California megaflood

What I didn't know when reading about this is that it happened before in 1861. Sacramento, the new state capital at the time, was under ten feet of debris-filled water for months.

What strikes me about these predictions is, again, they're very specific with the main question not being if, but when. Earthquakes are notoriously hard to time, but Dr Kerry Sieh states in the video that it will most likely happen during the lives of the children in the video, perhaps much sooner. That's very specific.

One question I have is, as these predictions get more and more specific and accurate, will they have any impact?