Though this is the worst drought in some 1200 years, long term trends show that 3-year droughts are not uncommon:
But for the first time since 2009 a blocking ridge of high pressure has dissipated and restored the Hawaii to California moisture laden path known as the Pineapple Express.
While the storm will bring major problems, including flooding, mudslides and damaging winds, it will bring much needed rain to the region.
From 1-3 inches of rain will fall on coastal Southern California with an average of 3-6 inches of rain forecast over central and northern parts of the state. This translates to between 17 and 100 million gallons per square mile from this storm alone.
Another storm will arrive on Sunday. Though not as wet as the present one it will certainly help.