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flood warnings are posted parts of northern california currently suffering from extreme drought. extreme weather could include something called a bomb cyclone, and that s the third round in a series of strong storms. let s bring in meteorologist derek van dam. derek, those warnings seem to be getting more and more urgent. reporter: yeah, it s a powerful storm that actually meets a certain set of requirements that classify this as a bomb cyclone. it has to drop in millibars or pressure to identify a certain strength. and in fact, this bomb cyclone, per se, this low pressure, is equivalent to what we would experience in a major hurricane, for instance. the pressure levels there are comparable. so very interesting to see, nonetheless. but this storm is creating what is called an atmospheric river of moisture. picking up this moisture from the pacific ocean and dpepositig

Northern californiaFlood warningsBomb cycloneDerek van damMeteorologist derek van damPer sePressure levelsPacific ocean