This weekend could get biblical in terms of rain and flooding with what the National Weather Service calls a once in a 5- to 25-year storm. What they classify scientifically as "an Atmospheric River" KRON4 translates as a fairly serious downpour from Saturday to Monday in the Bay Area with flooding expected.

But hey, don't take our word for it. Instead, see these histrionic, all caps tweets from the National Weather Service.

The schedule of events: The National Oceanic and Atmospheric Administration has issued a hazardous weather outlook as of today, with isolated showers possible, then Friday will be clear and dry as rain develops Saturday, becoming heavy Saturday night through Sunday and Monday morning. Temperatures will be in the mid 50s throughout, and rain showers on and off are expected for the next ten days to look forward to. Now, have a look on the chart below:

Meanwhile, Tahoe and the Sierras are getting their precipitation in the form of snow, roughly seven feet of it.