Shared by: IMSG
North America’s Pacific Northwest region is no stranger to wet weather, especially in the fall. Large waves of moisture, often called the “Pineapple Express” or atmospheric rivers, frequently start as belts of moisture in the Central Pacific and make their way eastward, pushed by the prevailing westerly winds. Using imagery from NOAA’S Global Forecast System weather model, watch as a storm develops in the Western Pacific, intensifies into Typhoon Phanfone, moves north across Japan, and then east across the Pacific. A mixture of atmospheric moisture and wind speeds data are used to illustrate the evolution of this system.