I reckon the trumpets are happening in the spiritual realm, here's why;

First of all, christ said he shall come as a thief, without warning.

Also the bible states that just as in the days of Noah's flood, people will be marrying and giving in marriage, eating, drinking. Just going about their daily lives...then, WALLOP!

As lightning flashes from the east across to the west, so shall the coming of the son of the man be.