Not really that wierd. Oregon has two tornado seasons. We are barely into the first, and the second is in mid to late September. We actually average one tornado per year. Rarely do they get as intense or as powerful as those of the Great Plains. Last year, we stood outside and watched several dips from a weak Mesocyclonic formation. That was in early September. Yesterdays weather was indeed abnormal, as we general don't get a northern high pressure system that confronts a southerly low. It's usually the opposite. The squall lines generally form off the Oregon coast, and move inland, or they form over the Cascades. Remember though, that a funnel cloud is not the same as a tornado. It has to contact the ground in order to be tornadic. Funnels are very common in Oregon spring/fall seasonal weather. We average hundreds of funnels per year, but the vast area of uninhabited lands makes most go unnoticed.