High pressure over the Azores and lower pressure over Iceland affect weather in Europe. A steeper pressure gradient pushes the jet stream further north and the weather over western Europe tends to be milder, see El Nino/Southern...

The North Atlantic oscillation (NAO) is a climatic phenomenon in the North Atlantic Ocean of fluctuations in the difference of sea-level pressure between the Icelandic Low and the Azores high. Through east-west rocking motions of the Icelandic Low and...