http://www.businessinsider.com/blood...saster-2016-12

If the miracle of liquefaction fails to occur, it can herald disaster for the coming months and years.

The blood failed to become liquid in 1939, the year in which World War II started, and in 1980, the year of the Irpinia earthquake, according to the Stampa report.
A few items about this ritual are somewhat interesting. The relic goes dry to liquid during ceremonies or rituals and has been doing so for over 600 years. Bad things happen when the blood stays dry. San Genaro, aka, Saint Januarius is a Saint in both Catholic and Orthodox religions.

http://www.catholicnewsagency.com/ne...ot-says-74307/

The reputed miracle is locally known and accepted, though has not been the subject of official Church recognition. The liquefaction is believed to happen at least three times a year: the Saturday before the first Sunday of May, Sept. 19, which is the saint's feast day, and Dec. 16, the anniversary of the 1631 eruption of the Mount Vesuvius volcano.

During the miracle, the dried, red-colored mass confined to one side of the reliquary becomes blood that covers the entire glass. In local lore, the failure of the blood to liquefy signals war, famine, disease or other disaster.