I watched the large dark cloud formation as I drove north on I-5 approaching highway 34 around about 5:20 this evening. After I saw a small cloud drift sharply upward into the darkest part of the cloud I pulled over to take this video. In the center of the screen you can see a funnel start to form and swirl. I decided to drive farther north to get a closer shot but the funnel disorganized few seconds later.
