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Weather Pattern Products

A suite of climate monitoring products focused on weather patterns. 

Arctic Oscillation (AO)

Information on the Arctic Oscillation (AO), a large scale mode of climate variability, also referred to as the Northern Hemisphere annular mode.

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El Niño / Southern Oscillation (ENSO)

Information on the El Niño Southern Oscillation (ENSO), a periodic fluctuation in sea surface temperature and air pressure in the equatorial Pacific Ocean.

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Monthly Synoptic Discussion

A summary of synoptic activity in the U.S.

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Monthly Upper Air Report

Tropospheric and stratospheric temperatures, with data placed into historical perspective.

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North Atlantic Oscillation (NAO)

Information on the North Atlantic Oscillation (NAO) index, which is based on the surface sea-level pressure difference between the Subtropical (Azores) High and the Subpolar Low.

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Pacific Decadal Oscillation (PDO)

Information on the Pacific Decadal Oscillation (PDO), often described as a long-lived El Niño-like pattern of Pacific climate variability.

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Pacific-North America Index (PNA)

Information the Pacific-North America (PNA) pattern, one of the most prominent modes of low-frequency variability in the Northern Hemisphere extratropics, appearing in all months except June and July.

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