People across the West Coast could face weather-related disruptions next week as a powerful atmospheric river brings the threat of heavy rain, mountain snow, and damaging winds to three states.
California, Oregon, and Washington are among the areas facing potentially hazardous conditions.
The latest outlook follows a NOAA Climate Prediction Center warning of increased rainfall across vulnerable parts of the country. The greatest concerns are centered on areas where heavy precipitation could combine with strong winds, creating conditions that may disrupt everyday life.
However, weather severity is expected to vary considerably by location and elevation.
What is an atmospheric river?
An atmospheric river is a natural weather system that transports enormous amounts of water vapor through the atmosphere.
These long bands of moisture can stretch thousands of miles, carrying warm, humid air from the tropics toward the north. When they reach land, it falls as rain or snow.
Heavy rain can overwhelm drainage systems, raise river levels, and cause flooding, according to UNILAD. Strong winds can bring down trees, damage power lines, and leave homes without electricity.
California faces heavy rain and mountain snow
Northern and central California are among the areas NOAA has identified as having an increased chance of substantial rainfall between November 13 and 15.
The forecast is particularly concerning for communities that are already susceptible to flooding.
Higher elevations in the Sierra Nevada could also see significant snowfall, according to NOAA’s moderate-risk forecast.
Oregon could see damaging winds and snowfall
Oregon is also expected to experience potentially disruptive conditions, with parts of the state included in the Pacific Northwest’s moderate-risk area for heavy precipitation, according to UNILAD.
Higher elevations could receive significant snowfall as the system moves inland. Along the coast, strong winds are another concern as trees can fall and damage power lines.
Washington included in high-wind outlook
Washington is also being monitored as the atmospheric river approaches, with coastal communities facing an increased risk of strong winds.
NOAA’s moderate-risk outlook includes parts of the state’s coastline, where powerful gusts could cause damage and disrupt local infrastructure.
Rainfall is also possible across portions of Washington. However, the latest projections indicate that expected precipitation totals may be lower than earlier forecasts suggested.
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