My opinion is that 2nd part is easy to see happening -- the mainstream consensus view we read is supposed to be that the warming of the ocean's make storms get stronger, as just happened a lot recently in the Atlantic and Caribbean. As Christ worded it, we are to look at that 'tree' to see if many leaves are showing, and that's going to be more than just 1 or 3 leaves of course. As I think of it about 3 leaves are present, but there are a lot more than 3. More could be present and I didn't get it yet, of course. Now the signs in the heavens I've wondered about many times, and not superficially, since my main hobby is following astronomy/astrophysics. There are so many possibilities. It could be something that He foresaw that our increasing ability to observe would reveal to us, or instead a more commonplace idea like a major easy to see thing anyone could see easily, like bright comets, etc. So, that could be easy to see, or instead something that watchers (astronomers) would tend to see, and we'd have to hear about it from them, either one. It could be much closer, like in our atmosphere, like a set of meteor showers or bright meteors or unusually strong sun spots or unusually strong auroras that go far from the poles and become visible everywhere, or such. So many possibilities. Or, even it could be more metaphorical somehow, but I only keep this as yet another option, not my main guesses. Also, we know we always want to be ready of course since no one knows what day is their last day normally.