Mel,
Thanks for your question. I knew for a long time
Revelation 6:15-18 is the Great Warning and we know from
seers, approved seers, we will see the cross in the sky.
I checked a visionary from Brazil, Light of Mary, she posts
another verse from Scripture and a few descriptions, not
all of them shared on her page, of the Great Warning.
http://www.revelacionesmarianas.com/The%20Warning.htm
(1) THE GRAND CROSS THAT WILL BE SEEN IN THE SKY
THEN THE SIGN OF THE SON OF MEN WILL APPEAR IN THE SKY;
AND THEN ALL THE TRIBES OF THE EARTH WILL MOURN
(Matthew 24:30)
THE SIGN OF THE SON OF MEN THAT ALL MEN WILL SEE FROM EAST TO WEST, FROM NORTH TO SOUTH, CAUSED BY THE ANGELS OF THE COSMOS THAT ACCOMPANY ME.
THE BLUE CROSS THAT WILL APPEAR BEFORE YOUR EYES AT 400 KILOMETERS
DISTANCE FROM THE EARTH .
Giorgio Bongiovanni (Message 30-07-2007)
WHEN EVERYTHING COMES, A CROSS WILL BE SEEN IN THE SKY,
A VERY GRAND ONE
José Luís Manzano García (Message 06-29-1988)
OTHER REVELATIONS REGARDING THE UNIVERSAL WARNING
Message from our Blessed Mother Mary to Marcos Tadeu, Brazil of 02/21/2010
I ask you, therefore, to listen to My Voice! Do what I tell you before the time of the Divine Mercy ends for you. The period of time for the conversion of the world is much shorter now than ever before. Soon the WARNING will come and it will be like a small personal judgment.
Message from Our Lady to Pedro Regis, Brazil 12/08/2009
The day will come that men will attain great graces. A great miracle of God will transform the hardened hearts. Each one will see their errors and will receive the grace of repentance. This will be the great opportunity that our Lord will give His children who have separated from Him.
Message from Our Lady to Pedro Regis, Brazil 07/14/2009
God will do a great miracle as a favor to men. Humanity will have the great opportunity to return to Our Lord. When the great sign comes, all eyes will see it. Men will have the opportunity to repent. It will be a grand miracle and many will be converted
Message from Blessed Mother Mary to Amparo Cuevas Spain year 1983
A Warning will be given to you and your soul shall reveal like in a mirror what you have been during your whole existence.
St. Michael to José Luis M. García Spain on 11/19/1989
There is something that will occur in the world; something that will make many people see the truth and some will say that it is in the nature of things.
Something is coming to the world, something very grand. It is not the end of the world; it is the beginning of the conversion of many souls.
The Blessed Virgin Mary to Christina Gallagher Ireland on 07/05/2002
The great light of God will soon descend upon the world, there will be great weeping and many will flee, trying to hide its shame before God.
The Blessed Virgin Mary to Christina Gallagher Ireland year 1988
A sign will come for which all of humanity will experience the external knowledge that God exists, and they will know that it comes from God; everyone will see themselves as they really are.
The Blessed Virgin Mary to Felisa Sistiaga Monte Umbe, Spain 1941
I will give a Warning, I will perform a miracle, everyone will see it, but humanity, except for a very few, will continue to doubt. I have appeared in many places in the earth, but few believe.
The Blessed Virgin Mary to Felisa Sistiaga Monte Umbe, Spain 08/15/1969
Before the chastisement God will send a Warning, and for no one to have any doubt there will be a Miracle.
Thank-you very much for your enthusiastic response - I shall look it up in due course.
Mel