Mean travel distance was found to be about 400 miles (650 kilometers) with AR 1 and about 2,900 miles (4,700 kilometers) with AR 5, while mean lifetime was about 17 hours for AR 1 and 110 hours for AR 5. To rank the events, the study authors then applied the atmospheric river scale, which is based on a storm’s expected duration and maximum rate of water vapor transport.Īcross the 40 years studied, higher-ranked storms lasted longer and traveled farther than lower-ranked storms. In the new study, scientists built a database of global atmospheric river events from 1980 to 2020, using a computer algorithm to automatically identify tens of thousands of the events in the Modern-Era Retrospective analysis for Research and Applications, version 2 ( MERRA-2), a NASA re-analysis of historical atmospheric observations.
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