I also know in my spirit that something big is coming. I went through about a year long backslide from discouragement and a need of a revelation of God's Grace and Love for His children.
In ministry for years, and the Lord opening my eyes and having me speak to the sins and lukewarmness of the church we were are a part of, I was discouraged and despondant. The Lord taught me much about grace and His love after all this, and I am changed.
Anyways, all the things I had preached against early on, I had actually become. I was hiding from God on my leather couch, with my 60" TV, my Playstation3, my wine, etc. I just gave up and rolled over and played dead.
The Lord in His infinite mercy reached into this environment (I was formerly a gun-toting drug dealer and a very violent man who got miraculously saved and delivered over a decade ago - I had seen the Lord work miracle after miracle since my new birth) and spoke to me as I walked up my stairs one day.
He said, "Son, there is something big coming, and you are not ready." It broke me that He even still loved me after all I had done to try to hide myself from Him. I was BROKEN and now I understand not only His righteous judgements and His wrath, but also truly His grace, love, and mercy!!
And, I am not some, as some of you may assume (as I would have at one time), someone who thought they were saved and living in false assurance and willful sin. Andrew Strom and his family has stayed in my home, I have ministered on the streets with Darren Smith, I have been to Myanmar with David Servant, etc. My point is that I KNOW I WAS BORN AGAIN, and still became so discouraged and disillusioned by the enemy's lies that I truly did backslide.
Anyways, this was about 6 months ago now, or so. We (my wife and 5 small kiddos) have sold our house (and everything else), moved to the country, and am in the process of buying a fifth wheel to live in. Not the call for everyone I am sure, but what the Lord has told us to do. I sensed a great urgency several months ago, as I know many others did, including men of reputable public ministry like David Wilkerson and others.
Well, over the last month, or maybe two, it seemed to be less of an everpresent sense of urgency. I prayed and asked the Lord if we jumped the gun or rushed ahead of Him in presumption, and the Lord spoke to me again and said, "the calm before the storm."
Our suppossed "economic recovery" as stated in the media would confirm this sort of thing. It is quiet again lately it seems. Well, a couple of nights ago I had a VERY SURREAL DREAM about a huge storm on the very horizon. I knew inwardly what it was and still the Spirit spoke that "the time is short" and to make final preperations as He leads.
With all love and respect, I don't think the scriptures you referenced pertain to what is coming, but to the actual day/hour when Christ returns. In fact, those who were "marrying and given in marriage" and going about their business when the flood of judgment came were the lost, not the Lord's. Obviously Noah had been preparing for it, as the Lord led, for years, and knew when to get in the ark, and was saved.
Noone I know has claimed to even know the DAY or the HOUR of what is coming, but only that it is coming soon. Didn't Jesus give a rebuke for "not knowing the seasons and the signs of the time"? Also, look in the book of Acts and see where the Lord spoke to the church in Jerusalem and warned them that a famine was coming to the land, so they prepared and were saved. Joseph and the famine in the land. Etc.
Go back, examine these scriptures you reference and see that this is referring to His coming in the clouds of glory (His final return) and still that it refers to noone knowing the actual date/hour, not necessarily that the Holy Spirit won't be speaking urgency to those who are His to be ready.
Also, our America-central mindsight, theology, and psychology makes us think that the end of the world hinges on America as the center of God's plan. It doesn't. If you study the prophetic books and eschatology in depth, you know that America could be totally annihalated and it wouldn't affect end-times events one bit.
We think if we were wiped out or something it would be the culmination of time and space. Not true. You see Israel and the coutries of the east in the end-times scriptures with not alot of glaring references to what appears to be America. So, again, using the scripture references you did, doesn't exactly parralell with the possibility of a calamity.
Do you think God might have warned whatever believers were in Hiroshima before the bomb was dropped? I don't know if He did or not, but He could have. Time square church in New York was warning of a calamity coming in the weeks before 911. They were right, and God was warning His church to be sober and vigilant and prepare their hearts and their hands for service.
I believe when men like Paul Washer speak of soon coming great persecution, Andrew Strom of a coming depression, David Wilkerson & Carter Conlon of a soon calamity, Kay Arthur of a coming famine, etc., etc., and the Lord speaks to me and to many other "unknowns" brethren in their spirit - I believe it is coming, it is coming soon (although with God that could be tomorrow, next month, next year, etc.), and that God is lovingly warning His children to prepare their hearts and their hands for service.
Blessings and Peace,
Jeff