A significant mid-latitude cyclone is expected to impact the West Coast of the United States this week, bringing a powerful atmospheric river to regions of Oregon and California. This storm system is experiencing bombogenesis, a process in which the low-pressure system intensifies rapidly—forecast models indicate a pressure drop of 50 to 60mb within a 24-hour period, well above the usual threshold.
From Tuesday through Thursday, the storm is poised to deliver heavy rainfall and strong winds to the Northwest and northern California. The infusion of sub-tropical moisture is set to lead to extreme precipitation events, with Northern California already designated as having a high risk of excessive rainfall, particularly affecting areas prone to flooding.
Rainfall amounts may exceed a foot in parts of Southern Oregon and Northern California, resulting in potential flooding, including river and flash floods. Residents in low-lying areas are urged to prepare for possible evacuation if flash flood warnings are issued. Strong winds along the coast could also cause tree falls and power outages, particularly from Tuesday into Wednesday. The storm is expected to rate exceptionally high on the atmospheric river scale, indicating predominantly hazardous conditions, although some rainfall may also prove beneficial.
Additionally, Winter Storm Warnings are in place for higher elevations of Northern California through Wednesday, where heavy snowfall is anticipated.
Residents are encouraged to stay informed and updated on this impactful weather event through reliable weather sources.
This storm underscores the importance of preparedness in the face of severe weather conditions. Communities in the affected areas have an opportunity to come together, showcasing resilience as they navigate through the potential challenges ahead.