Atmospheric rivers are narrow regions in the atmosphere that transport much of the moisture from the tropics to northern latitudes. 2020-21 Driest water year La Nina no rain could it be a very similar to driest year surpassed was 2006-2007 year, then a 2001-2002 year. AccuWeather.com Meteorologist Bernie Rayno explains the weather phenomenon known as a 'Pineapple Express.' Throughout the year, a weather system known as an "atmospheric river" can impact states along the West Coast of the U.S., causing flooding, heavy snow, and the threat of mudslides. Pineapple Express is a non-technical term for a meteorological phenomenon characterized by a strong and persistent flow of moisture and associated with heavy precipitation from the waters adjacent to the Hawaiian Islands and extending to any location along the Pacific coast of North America. Basically, in weather conversations, Pineapple Express means a very large amount of warm rain, specifically in mid-latitudes. Pineapple Express is the name given to an atmospheric river that originates near Hawaii and travels across the Pacific Ocean to the western coast of North America. A concentrated band of moisture extending from the tropics to the mid-latitudes known as the "pineapple express" is spinning up another storm that will find its way to the Midwest Saturday. Wet, wet, wet! That means it’s a term actual meteorologists don’t use – instead, it’s more common for laypeople instead. The Pineapple Express is a weather system that brings moist air from the tropics that drenches the Greater Vancouver Area with torrential rainfall. 2019 was Weak El Nino wet year during the Pineapple Express storms on November 29, 2018, Jan 11-17, 2019, Feb 2, 2019, Feb 14, 2019, it was similar to El Nino storms since 2010, 2005, 1980, or 1995. Atmospheric rivers are part of the Earth's ocean water cycle, and are tied closely to both water supply and flood risks. Thanksgiving week weather forecast -- where storms will keep you indoors. ... Christmas week forecast includes snow, ice and cold weather. Pineapple Express is a non-technical meteorological term. December 21, 2020. January 31, 2020 was one of those Pineapple Express days! From all indications, the potential is increasing for another healthy snow event over the northern half of my area. “A buckled jet stream weather pattern known as the Pineapple Express has sent warm weather from closer to the equator north to Alaska, setting records there, even as it’s forced below-normal temperatures south from closer to the Arctic and into the Chicago area.” ... October 4, 2020 at 6:01 pm. The Pineapple Express isn’t all about sunshine, warm weather, and Mai Tais. In winter, a high-pressure system over the Gulf of Alaska blocks the polar jet stream, which may split and form a southerly branch across the mid-Pacific. Top Stories. 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