Large parts of the western US are forecast to be battered by more rain and wind because of an “atmospheric river” phenomenon, after the Californian city of San Diego experienced one of the wettest days in its history this week.
The US’s National Weather Service has warned the west coast will experience an “impactful atmospheric river event” next week, bringing higher than normal levels of rain and wind, along with possible flooding.
Atmospheric rivers are often described as a powerful hose, as they are typically long and narrow and carry water vapour from the tropics over land, where it usually falls as very heavy rain or snow.
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