In brief
The storm threatens millions with hazardous conditions, from flooding to snowstorms, as it intensifies throughout the week.
A fierce storm referred to as a "bomb cyclone" is making its way toward the US Northwest, threatening over seven million residents with severe weather conditions. The National Oceanic and Atmospheric Administration (NOAA) has warned that the storm, which began affecting the area on Tuesday, is likely to intensify until the end of the week.Residents in states along the Pacific coast can expect a mixture of strong winds, heavy rain, and significant snow, possibly leading to dangerous flash floods, mudslides, and rock slides. The situation is especially concerning for mountainous areas, where blizzard conditions and heavy snow accumulation are anticipated. The bomb cyclone is characterized by a rapid drop in air pressure, contributing to the storm's intensification. With the first effects already felt in the Seattle area, forecasters predict heavy, wet snowfall across the Pacific Northwest, with snow accumulation rates of 2-3 inches (5-8 cm) per hour. Winds are projected to reach up to 65 mph (29 mps), raising concerns over power outages and difficult travel conditions caused by whiteouts. Some regions could see snow totals ranging from 10 to 20 inches (25-50 cm).NOAA has reported a "high risk excessive rainfall outlook" for northwest California, with the most significant rainfall likely to lead to mudslides particularly in northern California and southwestern Oregon. In response, the National Weather Service has issued winter weather alerts and warnings through Wednesday for several areas along the Pacific coast.The term "bomb cyclone" refers to a weather phenomenon where a storm rapidly intensifies, indicated by a drop of at least 24 millibars in central air pressure within a 24-hour period. These storms can bring a variety of severe weather outcomes, including blizzards, thunderstorms, and heavy rainfall. Meteorologists have noted that while such atmospheric river events are typical for this time of year, the combination of a bomb cyclone with these moisture systems can lead to unprecedented weather patterns. The Pacific Northwest is bracing for what could be an impactful week of weather, with dangerous conditions anticipated.
