Have any Orthodox clergy expressed a belief in an impending doomsday/judgment? For a few months now, I have been receiving unsolicited letters, pamphlets, and bulletins regarding the 'end times', 'coming prophetic storm', 'God's impending judgement', etc.

I have family members who are extremely concerned about Jonathan Cahn's bloodmoon judgement literature (he says the four recent lunar eclipses are a sign from God telling us something crazy is about to happen, I can't distinguish this from astrology).

It seems that a significant percentage of the Protestant church in America believes God will produce some type of upheaval, whether it's the Second Coming or a smaller-scale judgement event, very shortly. Have any Orthodox priests or deacons expressed this belief?
What @Adam Heeg said.

Matthew 24 is Jesus' description of things to pass before the end times (Ex: [verse 7] "For nation shall rise against nation, and kingdom against kingdom: and there shall be famines, and pestilences, and earthquakes, in divers places.").

But these are things that have been happening for a very long time.

And that same chapter (verses 35 - 37) states we won't know until it actually happens: "[35] Heaven and earth shall pass away, but my words shall not pass away. [36] But of that day and hour knoweth no man, no, not the angels of heaven, but my Father only. [37] But as the days of Noe were, so shall also the coming of the Son of man be."

The point is to be presently alert and keep your soul prepared by doing things in the now that God commanded us to do.

BTW, Orthodox Priests do not read from Revelation as part of the yearly Liturgical readings.  Nor do they discuss their own interpretations of it or "end times" in their homilies (sermons).  Though Revelation may be quoted, or groups may have a bible study on it.