For the most part, the miracles of the Old Testament were of an external nature, sometimes on a global scale, as with the Flood, but more often on a national scale, as with the Exodus. Those of the New Testament, however, were primarily of a personal and spiritual nature. An individual's domestic life was often the scene of Christ's mighty works.
For example, the Old Testament records such miracles as the destruction of Sodom and Gomorrah (Genesis 19) and of Jericho (Joshua 6), yet in the New Testament, the sick are healed, demons are exorcized (Luke 6:17-19), and the dead, like Lazarus (John 11:1-44), are resurrected. In sum, Old Testament miracles tend to glorify God in relation to His sovereignty over the physical realm, while New Testament miracles chiefly glorify God in relation to His sovereignty over the spiritual realm.
Martin G. Collins
The Miracles of Jesus Christ (Part One)