Janice R. Andrews
A powerful atmospheric river, known as the Pineapple Express, is set to unleash a deluge across California and the Pacific Northwest, delivering up to a foot of rain in some areas over just a few days. This dramatic weather shift comes after a dry January that exacerbated wildfires in Southern California. Forecasters warn of flooding, landslides, and travel disruptions as the storm system drenches the region.
The National Weather Service (NWS) has issued alerts for northern and central California, where some areas could receive a month’s worth of rain by Wednesday. Heavy mountain snow and high winds are also expected, raising concerns about power outages and hazardous travel conditions. Cities like San Francisco and Redding are forecast to see 4-8 inches of rain, far exceeding their typical February averages.
Atmospheric rivers, like the Pineapple Express, are long, narrow bands of moisture that originate in the tropics and transport vast amounts of water vapor. This particular system, originating near Hawaii, is notable for its prolonged duration. “What stands out about this Pineapple Express is how long it’s lasting,” said AccuWeather meteorologist Heather Zehr. “The rain has been piling up since Thursday night.”
The storm’s impacts are already being felt, with the potential for landslides and mudslides from Northern California to San Francisco. These could lead to road closures and significant travel delays. Meanwhile, the heavy rainfall raises the risk of flooding in low-lying areas and rapid rises in rivers and streams.
While the West Coast braces for torrential rain, other parts of the U.S. are experiencing extreme weather contrasts. Record-high temperatures are expected across the Southwest and Southern Plains, while Arctic high pressure from Canada will bring frigid conditions to the northern tier of the nation.
The Pineapple Express is not expected to maintain its intensity as it moves inland. “As it loses its connection to the tropics, the storm will fizzle out,” Zehr explained. However, the East Coast is bracing for its own weather challenges later this week. A massive storm system could bring severe thunderstorms, ice storms, and snow to the eastern half of the country, creating dangerous conditions for millions.
As California and the Northwest prepare for the relentless rain, residents are urged to stay informed and take precautions. The NWS advises avoiding flooded areas, preparing for potential power outages, and heeding local warnings. This dramatic weather event underscores the power of atmospheric rivers and their ability to reshape landscapes in a matter of days. Stay tuned for updates as the Pineapple Express continues to unfold.
