Frigid winter-like temperatures greeted more than 45 million people early Wednesday with wind chills in the 20s and 30s across parts of the Northern Plains, Midwest, Ohio Valley and Northeast. An area of high pressure over the Northeast is funneling cold air from Canada over the region, with the winter chill also lingering across the rest of the Northern Tier. A more seasonal warmup will begin Thursday as that high moves off the coast, which could bring conditions back into the 70s by the weekend.