Earthquake?

Last night, well 3:00 in the morning, we were about blasted out of our beds. The house shook and we jumped up and said earthquake. Then as we sat there waiting for our heart rates to go back to normal we noticed the sky was still rumbling. It was actually thunder that had made our house shake. We don't often have thunder and lightening storms here in California. Today it has been cloudy, thundering, and lightening, and WARM. I saw the biggest rain drops ever this morning. I have to admit the unusual weather change is kind of fun.