A powerful mid-latitude cyclone is set to strike the West Coast of the United States this week, bringing a significant atmospheric river to Oregon and California. Known as a “bomb cyclone,” this low-pressure system is experiencing extreme intensification, with a projected drop in atmospheric pressure of 50 to 60 millibars within a single day—far exceeding the 24 millibar threshold usually required for this classification.
The storm, anticipated to develop from Tuesday to Thursday, will have profound effects on the Northwest and northern California. Residents can expect heavy rainfall, fierce winds, and high ocean swells due to the moisture influx from sub-tropical regions. The Weather Prediction Center has already flagged parts of Northern California with a HIGH RISK of excessive rainfall, indicating the potential for significant flooding.
Rainfall totals may exceed a foot in Southern Oregon and Northern California, leading to river and flash flooding in these regions. Those in flood-prone, low-lying areas are advised to prepare for possible evacuations if flash flood warnings are issued. Coastal areas may also experience strong winds capable of uprooting trees and downing power lines, particularly during Tuesday and Wednesday.
In the higher elevations of Northern California, Winter Storm Warnings are in effect, predicting heavy snowfall through Wednesday.
As this storm system approaches, it’s crucial for residents to stay informed and ready to act in response to changing conditions. While the potential for hazardous weather is serious, the rain may also bring much-needed moisture to drought-stricken areas, offering a glimmer of hope for improved water resources in the long term. Updates can be found through WeatherNation both on air and online.
Stay safe and prepared as this weather system unfolds!