Weather patterns over Southern Hemisphere have a regular pulse

Atmospheric cycle 20 to 30 days long is first one found outside tropics

By Gabriel Popkin, 14:39 PM February 7, 2014

Variations in rainfall and storm intensity over a broad swath of the Southern Hemisphere follow a pattern that repeats every 20 to 30 days. The pattern is the first regular atmospheric oscillation found outside the tropics and could help scientists forecast weather and climate changes in the region.

Weather is notoriously chaotic; even the best forecasts are rarely accurate more than a week or two out. In the last century, however, long-term climate patterns have emerged from seemingly disorder...

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