Matthew chapter 24 verses 27 thru 39
For as the lightning cometh out of the east, and shineth even unto the west; so shall also the coming of the Son of man be.
For wheresoever the carcase is, there will the eagles be gathered together.
Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:
And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
Now learn a parable of the fig tree; When his branch is yet tender, and putteth forth leaves, ye know that summer is nigh:
So likewise ye, when ye shall see all these things, know that it is near, even at the doors.
Verily I say unto you, This generation shall not pass, till all these things be fulfilled.
Heaven and earth shall pass away, but my words shall not pass away.
But of that day and hour knoweth no man, no, not the angels of heaven, but my Father only.
But as the days of Noe were, so shall also the coming of the Son of man be.
For as in the days that were before the flood they were eating and drinking, marrying and giving in marriage, until the day that Noe entered into the ark,
And knew not until the flood came, and took them all away; so shall also the coming of the Son of man be.
Christ's gathering together of His elect will be a global event and not a local event and He compared it to the days of Noah. Yes, said gathering will affect the four winds or the north, south, east and west from one end of heaven to the other. Why then would we even consider that Noah's flood was merely a local flood? To me, it's ridiculous and poor scholarship.
Furthermore, Christ mentioned how heaven and earth shall pass away and this won't be the first time that such a thing has happened. Again, according to scripture, our present heaven and earth are not the same heaven and earth that we read about in Genesis chapter one. At the time of Noah's flood, that heaven and earth underwent drastic changes and Peter wrote about the same:
2 Peter chapter 3 verses 5 thru 13
For this they willingly are ignorant of, that by the word of God the heavens were of old, and the earth standing out of the water and in the water:
Whereby the world that then was, being overflowed with water, perished:
But the heavens and the earth, which are now, by the same word are kept in store, reserved unto fire against the day of judgment and perdition of ungodly men.
But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day.
The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.
But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.
Seeing then that all these things shall be dissolved, what manner of persons ought ye to be in all holy conversation and godliness,
Looking for and hasting unto the coming of the day of God, wherein the heavens being on fire shall be dissolved, and the elements shall melt with fervent heat?
Nevertheless we, according to his promise, look for new heavens and a new earth, wherein dwelleth righteousness.
Peter begins by describing the heavens of old and the earth which stood in the water and out of the water and this is a direct reference back to Genesis chapter 1 verses 9 and 10:
And God said, Let the waters under the heaven be gathered together unto one place, and let the dry land appear: and it was so.
And God called the dry land Earth; and the gathering together of the waters called he Seas: and God saw that it was good.
Peter continued on to tell us that the world that then was perished, not only a localized part of it, and contrasted it with the heavens and the earth which are now. Again, we're currently living in a new heavens and a new earth in that they're not the original heavens and earth of Genesis chapter 1. Furthermore, there is yet another new heavens and earth coming which is the Christian's hope and said new heavens and earth are definitely global in sphere, so why the heck is anybody even considering that Noah's flood was only local in sphere?
Like I said, it's poor scholarship.
Besides, there are plenty of evidences which we can look at globally which point to a global flood, but the global flood deniers will merely attribute the same to different localized floods which produced the same types of evidences and when looked at together they merely give the appearance of one global flood. I'll give some examples of what I mean if I need to.