With the scientific speculation that the US will soon have a huge earthquake, could it be on April 11?
 
Look at all the 11's and their significance, no mere coincidence - its no wonder so many people were seeing 11's.
 
http://www.cuttingedge.org/News/n1756.cfm
 
This would be a 7 day warning before Passover starts - God in his wisdom is allowing us to be warned, as his word has foretold the troubles on the earth