Do we get thunderstorms? Oh, my do we ever!! From about March through June we get clobbered every couple of weeks it seems. Tornado warnings are common, tornado's touching down are not super common, but they do come around. North Texas probably gets 10-12 twisters that actually touch down every year, but they almost always seem to hit in the middle of a field (though two went through major areas in the last two years). Lots of hail and very strong straight line winds the last few years, as well. Brutal summers, which I have to assume you already know. But from October through March, the weather is fantastic most days...winter is a crap shoot. Some years it's very cold (lows in the teens) and lots of ice, some years (like this year) winter passes us by completely.
When we moved here 6 years ago, traffic was non-existent except at one major intersection about four miles away. Today it's a mess due to the extremely fast growth and the length of time it takes to get road projects completed.
Edit: I lived in NoCal for a few years...unless you live well inland right now, the summers will be a shocker for you. Highs are in the 90s to 100s every single day from May through the end of September. The mornings are wickedly humid, but it burns off around lunch time. The nights don't really cool down...just around 80 most nights. Enjoy