The first major atmospheric river event of the season is locked over Northern California, supported by two bomb cyclones, creating risks of flash flooding and landslides.
Atmospheric rivers are challenging to predict due to their narrow bands of moisture, which can cause varied rainfall amounts over short distances, impacting forecasts.
Regions like San Francisco could see rainfall varying from one inch to over six inches, illustrating the unpredictability of atmospheric river impacts.
Strong winds from the storm downed trees, leaving hundreds of thousands without power across Washington, showing the storm's widespread effects beyond just rainfall.
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