My question involves a driver's license issued by the State of: Washington State

I've scoured both this forum and the internet at large on this issue, but have not found a definitive answer. Most state DMVs provide information for people moving from state to state but not for those out of the country!

Anyway, my background is as follows:

- Driver's license from when I was 16 (back in the '90s) until June 2013 in California
- Traded in CA driver's license for Washington State license in June 2013
- Moved to Europe in August 2014
- Have not maintained a residence in Washington State
- Have not/will not get a EU driver's license

I plan to be here in Europe for about two years. I would like to visit my family in California for two weeks in spring 2015. Will I be allowed to drive in California (e.g., borrow my sister's car)? I'm not establishing residency there, just visiting. My Washington State license has not expired, but I'm not living there any longer either.

I don't want to be an unlicensed driver. If you tell me I should stay off the road (and can point me in the direction of some relevant codes), I definitely will!

Thanks for your help.