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The North Atlantic Oscillation (NAO) is a weather phenomenon that is defined by fluctuations in atmospheric pressure differences between the Icelandic Low and the Azores High in the North Atlantic region. This oscillation significantly influences weather patterns in Europe and North America, affecting precipitation, temperature, and storm tracks. The NAO has two phases: 1. **Positive NAO Phase**: During this phase, the pressure difference between the Icelandic Low and the Azores High is greater than normal.