My girlfriend's sister is a big-time Oregon wine snob (hates Pinot Noir oddly), but she claims "you can thank global warming for the great Oregon wine". Is this

My girlfriend's sister is a big-time Oregon wine snob (hates Pinot Noir oddly), but she claims "you can thank global warming for the great Oregon wine". Is this true? Has the quality gotten higher? I seem to recall hearing that Napa is starting to get a bit too hot.