Map of North America Weather Pattern (IMAGE)

University of California - Berkeley

Map of North America Weather Pattern

Caption

This is a map of the predominant weather patterns in mid-latitude North American from 70,000 to 55,000 years ago. The large ice sheet covering the northeastern portion of the continent caused a strong high pressure system to persist above it, which drew Gulf of Mexico-sourced precipitation (red arrows) into the mid-continent and Wyoming (white star). The result was rainy summers during this time, and possibly drier winters.

Credit

Erik Oerter

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All rights reserved. Editorial use only with credit to Erik Oerter.

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