Driest Year Ever?
San Francisco and most other cities in California will remember 2013 as the driest year ever. Take a look at the following chart: This shows the total rainfall to date and the percentage of normal. San Francisco is among the driest of the dry cities in California. Reno, Carson City and all of Tahoe are experiencing similar numbers. What looked like a decent December a few weeks back has turned dry, like the rest of 2013. Remember the snowy December of 2012. As soon as the year changed, so did the weather. And it hasn't changed back since! We continue to have a ridge of high pressure pushing storms east and north. That trajectory is never good for a major precip event. All of the models and now forecasters are pretty convinced that this pattern will remain in place through the end of 2013. I am starting to hop on that band wagon. However, there is hope. Our biggest, wettest storms have traditionally taken place when a certain condition is present. That condition is a combin...