I’ve lived in Northern California since the Summer of 1973, just shy of 50 years. Those maps look like the normal year-to-year variability we’ve had the past 50 years. We’ve had a lot of years where we get hit with gushers in November, December, and/or January, then the spigot shuts off. We’ve had years where it continued to rain for a few months. We’ve had a lot of years where we get hit with 2, 3 or 4 monster storms in the winter, then nothing. The only thing predictable about western rain and snowfall is how unpredictable and inconstant it is.
Its not just California though. Its the asinine Western water rights. There isnt a shortage of water, theres a shortage of bulldozers and the authority to use them. This wont end until the water rights issue is rectified or the American West sinks under a new ocean.
The democrats solution in California is to release most of the stored water in reservoirs into the ocean.