What do La Nina conditions mean for precipitation in San Diego and California?
As of October 1st, the rain calendar was reset and we are officially in the rainy season now through April. But La Nina is still in place for the third year in a row with its cooler sea surface temperatures, something that rarely happens. While we are entering what’s considered our rainy season, San Diego is also potentially heading into its third year of the drought, the state of California is in its fourth year of the drought and it’s the third year in a row of La Nina. … [A] La Nina can shift the storm pattern and leave much of California out of the storm track. And since most of our water comes from rain and snow in the Sierra Nevada and Rocky Mountains that can be a huge problem to the water supply.