The west coast of the United States is preparing to face a significant meteorological phenomenon: a category 4 to 5 atmospheric river associated with a squall in the process of explosive cyclogenesis. This event could cause accumulated rainfall of up to 600 liters per square meter, generating flood risks in regions such as California and Oregon.
As we explained in our glossary of meteorological terminology, atmospheric rivers are narrow streams of water vapor-laden air that move from tropical areas to mid-latitudes, carrying large amounts of moisture. Their classification, ranging from 1 to 5, is based on the amount of vapor transported and the duration of the event. Categories 4 and 5 are considered potentially dangerous due to the intensity and persistence of the precipitation they can generate.
The U. S. National Weather Service (NWS) has issued warnings for the West Coast, anticipating heavy rain, high winds and snowfall in mountainous areas. This system is expected to significantly affect coastal and inland areas, with possible transportation disruptions and landslide risks.
This precipitation will make it rain on the wet, as it is coming just a week after other areas of the western United States received record snowfall, including parts of Las Vegas and Colorado, which saw their heaviest accumulation in decades.
Thanksgiving will be affected by inclement weather.
This phenomenon coincides with the week leading up to Thanksgiving, one of the country’s busiest travel times, which could complicate travel plans for millions of people. Authorities are advising the public to stay informed about weather conditions and take precautions when planning travel.
The scientific community has observed an increase in the frequency and intensity of atmospheric rivers in recent years, attributed in part to climate change. These events can have beneficial effects, such as recharging reservoirs, but also pose significant threats due to the flooding and damage they can cause.
In response to this event, local and state authorities have activated emergency plans and are coordinating efforts to mitigate impacts. The population is urged to follow official indications and to prepare adequately to face the adverse conditions ahead.
