Weather tracker: US storms linked to ‘atmospheric river’ phenomenon

California faced evacuation warnings over flood risk, while Japan experienced heavy early season snowfallEvacuation warnings were issued last week in California as heavy rain brought the risk of flooding and landslides. The storms in the US were linked to a phenomenon known as an “atmospheric river” – a long filament of moisture-laden air that originates above the Pacific Ocean and provides vital replenishment of reservoirs and snowpack along the western coast of the US. However, they can also bring destructive volumes of rain, particularly along coastal areas.Elsewhere in the US, parts of Colorado experienced some of their longest stretches of snowless days ever this year, with Denver surpassing its third-latest snowfall date this week after recording its highest ever November temperature of 28C earlier in the month. The warm temperatures and lack of snowfall have also forced ski resorts to delay opening until December. Continue reading...