Wiki defines a supermoon as
A “supermoon” is the coincidence of a full moon (or a new moon) with the closest approach the Moon makes to the Earth on its elliptical orbit, or perigee, leading to the technical name for a supermoon of the perigee-syzygy of the Earth-Moon-Sun system. The association of the Moon with both oceanic and crustal tides has led to claims that the supermoon phenomenon may be associated with increased risk of events such as earthquakes and volcanic eruptions. However, the evidence of such a link is widely held to be unconvincing.
well according to the news it is expected that tonight we should be experiancing a supermoon but for some egypt our supermoon is not as big other countries i guess its just the curse of our location
read more news from different websites such as http://www.npr.org/2012/05/05/152032703/look-up-tonight-supermoon-is-closer-to-earth